The Azure-managed Default Rule Set (DRS) in the Application Gateway web application firewall (WAF) actively protect web applications from common vulnerabilities and exploits. These rule sets, managed by Azure, receive updates as necessary to guard against new attack signatures. The default rule set also incorporates the Microsoft Threat Intelligence Collection rules. The Microsoft Intelligence team collaborates in writing these rules, ensuring enhanced coverage, specific vulnerability patches, and improved false positive reduction.
You also have the option of using rules that are defined based on the OWASP core rule set 3.2 (CRS 3.2).
You can disable rules individually, or set specific actions for each rule. This article lists the current rules and rule sets available. If a published rule set requires an update, we'll document it here.
When you change a ruleset version in a WAF Policy, any existing customizations you made to your ruleset will be reset to the defaults for the new ruleset. See: Upgrading or changing ruleset version .
Default rule set 2.1
Default rule set (DRS) 2.1 is baselined off the Open Web Application Security Project (OWASP) Core Rule Set (CRS) 3.3.2 and includes additional proprietary protections rules developed by Microsoft Threat Intelligence team and updates to signatures to reduce false positives. It also supports transformations beyond just URL decoding.
DRS 2.1 offers a new engine and new rule sets defending against Java injections, an initial set of file upload checks, and fewer false positives compared with CRS versions. You can also customize rules to suit your needs . Learn more about the new Azure WAF engine .
DRS 2.1 includes 17 rule groups, as shown in the following table. Each group contains multiple rules, and you can customize behavior for individual rules, rule groups, or entire rule set.
Expand table
Fine-tuning guidance for DRS 2.1
Use the following guidance to tune WAF while you get started with DRS 2.1 on Application Gateway WAF:
Expand table
Rule ID
Rule Group
Description
Recommendation
942110
SQLI
SQL Injection Attack: Common Injection Testing Detected
Disable rule 942110, replaced by MSTIC rule 99031001
942150
SQLI
SQL Injection Attack
Disable rule 942150, replaced by MSTIC rule 99031003
942260
SQLI
Detects basic SQL authentication bypass attempts 2/3
Disable rule 942260, replaced by MSTIC rule 99031004
942430
SQLI
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (12)
Disable rule 942430, it triggers too many false positives
942440
SQLI
SQL Comment Sequence Detected
Disable rule 942440, replaced by MSTIC rule 99031002
99005006
MS-ThreatIntel-WebShells
Spring4Shell Interaction Attempt
Keep the rule enabled to prevent against SpringShell vulnerability
99001014
MS-ThreatIntel-CVEs
Attempted Spring Cloud routing-expression injection CVE-2022-22963
Keep the rule enabled to prevent against SpringShell vulnerability
99001015
MS-ThreatIntel-WebShells
Attempted Spring Framework unsafe class object exploitation CVE-2022-22965
Keep the rule enabled to prevent against SpringShell vulnerability
99001016
MS-ThreatIntel-WebShells
Attempted Spring Cloud Gateway Actuator injection CVE-2022-22947
Keep the rule enabled to prevent against SpringShell vulnerability
99001017
MS-ThreatIntel-CVEs
Attempted Apache Struts file upload exploitation CVE-2023-50164
Set action to Block to prevent against Apache Struts vulnerability. Anomaly Score not supported for this rule
Core rule set 3.2
The recommended managed rule set is the Default Rule Set 2.1, which is baselined off the Open Web Application Security Project (OWASP) Core Rule Set (CRS) 3.3.2 and includes additional proprietary protections rules developed by Microsoft Threat Intelligence team and updates to signatures to reduce false positives. As an alternative to DRS 2.1, you can use CRS 3.2 which is based off OWASP CRS 3.2.0 version.
CRS 3.2 includes 14 rule groups, as shown in the following table. Each group contains multiple rules, which can be disabled.
CRS 3.2 is only available on the WAF_v2 SKU. Because CRS 3.2 runs on the new Azure WAF engine, you can't downgrade to CRS 3.1 or earlier. If you need to downgrade, contact Azure Support .
Expand table
Tuning of Managed rule sets
Both DRS and CRS are enabled by default in Detection mode in your WAF policies. You can disable or enable individual rules within the Managed Rule Set to meet your application requirements. You can also set specific actions per rule. The DRS/CRS supports block, log and anomaly score actions. The Bot Manager ruleset supports the allow, block, and log actions.
Sometimes you might need to omit certain request attributes from a WAF evaluation. A common example is Active Directory-inserted tokens that are used for authentication. You can configure exclusions to apply when specific WAF rules are evaluated, or to apply globally to the evaluation of all WAF rules. Exclusion rules apply to your whole web application. For more information, see Web Application Firewall (WAF) with Application Gateway exclusion lists .
By default, DRS version 2.1 / CRS version 3.2 and above uses anomaly scoring when a request matches a rule. CRS 3.1 and below blocks matching requests by default. Additionally, custom rules can be configured in the same WAF policy if you want to bypass any of the preconfigured rules in the Core Rule Set.
Custom rules are always applied before rules in the Core Rule Set are evaluated. If a request matches a custom rule, the corresponding rule action is applied. The request is either blocked or passed through to the back-end. No other custom rules or the rules in the Core Rule Set are processed.
Anomaly scoring
When you use CRS or DRS 2.1 and later, your WAF is configured to use anomaly scoring by default. Traffic that matches any rule isn't immediately blocked, even when your WAF is in prevention mode. Instead, the OWASP rule sets define a severity for each rule: Critical, Error, Warning, or Notice. The severity affects a numeric value for the request, which is called the anomaly score:
Expand table
Rule severity
Value contributed to anomaly score
Critical
5
Error
4
Warning
3
Notice
2
If the anomaly score is 5 or greater, and the WAF is in Prevention mode, the request is blocked. If the anomaly score is 5 or greater, and the WAF is in Detection mode, the request is logged but not blocked.
For example, a single Critical rule match is enough for the WAF to block a request when in Prevention mode, because the overall anomaly score is 5. However, one Warning rule match only increases the anomaly score by 3, which isn't enough by itself to block the traffic. When an anomaly rule is triggered, it shows a "Matched" action in the logs. If the anomaly score is 5 or greater, there's a separate rule triggered with either "Blocked" or "Detected" action depending on whether WAF policy is in Prevention or Detection mode. For more information, please see Anomaly Scoring mode .
Upgrading or changing ruleset version
If you're upgrading, or assigning a new ruleset version, and would like to preserve existing rule overrides and exclusions, it's recommended to use PowerShell, CLI, REST API, or a template to make ruleset version changes. A new version of a ruleset can have newer rules, additional rule groups, and may have updates to existing signatures to enforce better security and reduce false positives. It's recommended to validate changes in a test environment, fine tune if necessary, and then deploy in a production environment.
If you're using the Azure portal to assign a new managed ruleset to a WAF policy, all the previous customizations from the existing managed ruleset such as rule state, rule actions, and rule level exclusions will be reset to the new managed ruleset's defaults. However, any custom rules, policy settings, and global exclusions will remain unaffected during the new ruleset assignment. You'll need to redefine rule overrides and validate changes before deploying in a production environment.
OWASP CRS 3.1
CRS 3.1 includes 14 rule groups, as shown in the following table. Each group contains multiple rules, which can be disabled. The ruleset is based off OWASP CRS 3.1.1 version.
CRS 3.1 is only available on the WAF_v2 SKU.
Expand table
Bot Manager 1.0
The Bot Manager 1.0 rule set provides protection against malicious bots and detection of good bots. The rules provide granular control over bots detected by WAF by categorizing bot traffic as Good, Bad, or Unknown bots.
Expand table
Bot Manager 1.1
The Bot Manager 1.1 rule set is an enhancement to Bot Manager 1.0 rule set. It provides enhanced protection against malicious bots, and increases good bot detection.
Expand table
The following rule groups and rules are available when using Web Application Firewall on Application Gateway.
2.1 rule sets
General
Expand table
Rule ID
Anomaly score severity
Description
200002
Critical - 5
Failed to parse request body
200003
Critical - 5
Multipart request body failed strict validation
METHOD ENFORCEMENT
Expand table
Rule ID
Anomaly score severity
Description
911100
Critical - 5
Method isn't allowed by policy
PROTOCOL-ENFORCEMENT
Expand table
Rule ID
Anomaly score severity
Description
920100
Notice - 2
Invalid HTTP Request Line
920120
Critical - 5
Attempted multipart/form-data bypass
920121
Critical - 5
Attempted multipart/form-data bypass
920160
Critical - 5
Content-Length HTTP header isn't numeric
920170
Critical - 5
GET or HEAD Request with Body Content
920171
Critical - 5
GET or HEAD Request with Transfer-Encoding
920180
Notice - 2
POST request missing Content-Length Header
920181
Warning - 3
Content-Length and Transfer-Encoding headers present 99001003
920190
Warning - 3
Range: Invalid Last Byte Value
920200
Warning - 3
Range: Too many fields (6 or more)
920201
Warning - 3
Range: Too many fields for pdf request (35 or more)
920210
Critical - 5
Multiple/Conflicting Connection Header Data Found
920220
Warning - 3
URL Encoding Abuse Attack Attempt
920230
Warning - 3
Multiple URL Encoding Detected
920240
Warning - 3
URL Encoding Abuse Attack Attempt
920260
Warning - 3
Unicode Full/Half Width Abuse Attack Attempt
920270
Error - 4
Invalid character in request (null character)
920271
Critical - 5
Invalid character in request (non printable characters)
920280
Warning - 3
Request Missing a Host Header
920290
Warning - 3
Empty Host Header
920300
Notice - 2
Request Missing an Accept Header
920310
Notice - 2
Request Has an Empty Accept Header
920311
Notice - 2
Request Has an Empty Accept Header
920320
Notice - 2
Missing User Agent Header
920330
Notice - 2
Empty User Agent Header
920340
Notice - 2
Request Containing Content, but Missing Content-Type header
920341
Critical - 5
Request containing content requires Content-Type header
920350
Warning - 3
Host header is a numeric IP address
920420
Critical - 5
Request content type isn't allowed by policy
920430
Critical - 5
HTTP protocol version isn't allowed by policy
920440
Critical - 5
URL file extension is restricted by policy
920450
Critical - 5
HTTP header is restricted by policy
920470
Critical - 5
Illegal Content-Type header
920480
Critical - 5
Request content type charset isn't allowed by policy
920500
Critical - 5
Attempt to access a backup or working file
PROTOCOL-ATTACK
Expand table
Rule ID
Anomaly score severity
Description
921110
Critical - 5
HTTP Request Smuggling Attack
921120
Critical - 5
HTTP Response Splitting Attack
921130
Critical - 5
HTTP Response Splitting Attack
921140
Critical - 5
HTTP Header Injection Attack via headers
921150
Critical - 5
HTTP Header Injection Attack via payload (CR/LF detected)
921151
Critical - 5
HTTP Header Injection Attack via payload (CR/LF detected)
921160
Critical - 5
HTTP Header Injection Attack via payload (CR/LF and header-name detected)
921190
Critical - 5
HTTP Splitting (CR/LF in request filename detected)
921200
Critical - 5
LDAP Injection Attack
LFI - Local File Inclusion
Expand table
Rule ID
Anomaly score severity
Description
930100
Critical - 5
Path Traversal Attack (/../)
930110
Critical - 5
Path Traversal Attack (/../)
930120
Critical - 5
OS File Access Attempt
930130
Critical - 5
Restricted File Access Attempt
RFI - Remote File Inclusion
Expand table
Rule ID
Anomaly score severity
Description
931100
Critical - 5
Possible Remote File Inclusion (RFI) Attack: URL Parameter using IP Address
931110
Critical - 5
Possible Remote File Inclusion (RFI) Attack: Common RFI Vulnerable Parameter Name used w/URL Payload
931120
Critical - 5
Possible Remote File Inclusion (RFI) Attack: URL Payload Used w/Trailing Question Mark Character (?)
931130
Critical - 5
Possible Remote File Inclusion (RFI) Attack: Off-Domain Reference/Link
RCE - Remote Command Execution
Expand table
Rule ID
Anomaly score severity
Description
932100
Critical - 5
Remote Command Execution: Unix Command Injection
932105
Critical - 5
Remote Command Execution: Unix Command Injection
932110
Critical - 5
Remote Command Execution: Windows Command Injection
932115
Critical - 5
Remote Command Execution: Windows Command Injection
932120
Critical - 5
Remote Command Execution: Windows PowerShell Command Found
932130
Critical - 5
Remote Command Execution: Unix Shell Expression or Confluence Vulnerability (CVE-2022-26134) Found
932140
Critical - 5
Remote Command Execution: Windows FOR/IF Command Found
932150
Critical - 5
Remote Command Execution: Direct Unix Command Execution
932160
Critical - 5
Remote Command Execution: Unix Shell Code Found
932170
Critical - 5
Remote Command Execution: Shellshock (CVE-2014-6271)
932171
Critical - 5
Remote Command Execution: Shellshock (CVE-2014-6271)
932180
Critical - 5
Restricted File Upload Attempt
PHP Attacks
Expand table
Rule ID
Anomaly score severity
Description
933100
Critical - 5
PHP Injection Attack: Opening/Closing Tag Found
933110
Critical - 5
PHP Injection Attack: PHP Script File Upload Found
933120
Critical - 5
PHP Injection Attack: Configuration Directive Found
933130
Critical - 5
PHP Injection Attack: Variables Found
933140
Critical - 5
PHP Injection Attack: I/O Stream Found
933150
Critical - 5
PHP Injection Attack: High-Risk PHP Function Name Found
933151
Critical - 5
PHP Injection Attack: Medium-Risk PHP Function Name Found
933160
Critical - 5
PHP Injection Attack: High-Risk PHP Function Call Found
933170
Critical - 5
PHP Injection Attack: Serialized Object Injection
933180
Critical - 5
PHP Injection Attack: Variable Function Call Found
933200
Critical - 5
PHP Injection Attack: Wrapper scheme detected
933210
Critical - 5
PHP Injection Attack: Variable Function Call Found
Node JS Attacks
Expand table
Rule ID
Anomaly score severity
Description
934100
Critical - 5
Node.js Injection Attack
XSS - Cross-site Scripting
Expand table
Rule ID
Anomaly score severity
Description
941100
Critical - 5
XSS Attack Detected via libinjection
941101
Critical - 5
XSS Attack Detected via libinjection.Referer header
941110
Critical - 5
XSS Filter - Category 1: Script Tag Vector
941120
Critical - 5
XSS Filter - Category 2: Event Handler Vector
941130
Critical - 5
XSS Filter - Category 3: Attribute Vector
941140
Critical - 5
XSS Filter - Category 4: JavaScript URI Vector
941150
Critical - 5
XSS Filter - Category 5: Disallowed HTML Attributes
941160
Critical - 5
NoScript XSS InjectionChecker: HTML Injection
941170
Critical - 5
NoScript XSS InjectionChecker: Attribute Injection
941180
Critical - 5
Node-Validator Blocklist Keywords
941190
Critical - 5
XSS Using style sheets
941200
Critical - 5
XSS using VML frames
941210
Critical - 5
XSS using obfuscated JavaScript
941220
Critical - 5
XSS using obfuscated VB Script
941230
Critical - 5
XSS using 'embed' tag
941240
Critical - 5
XSS using 'import' or 'implementation' attribute
941250
Critical - 5
IE XSS Filters - Attack Detected
941260
Critical - 5
XSS using 'meta' tag
941270
Critical - 5
XSS using 'link' href
941280
Critical - 5
XSS using 'base' tag
941290
Critical - 5
XSS using 'applet' tag
941300
Critical - 5
XSS using 'object' tag
941310
Critical - 5
US-ASCII Malformed Encoding XSS Filter - Attack Detected
941320
Critical - 5
Possible XSS Attack Detected - HTML Tag Handler
941330
Critical - 5
IE XSS Filters - Attack Detected
941340
Critical - 5
IE XSS Filters - Attack Detected
941350
Critical - 5
UTF-7 Encoding IE XSS - Attack Detected
941360
Critical - 5
JavaScript obfuscation detected
941370
Critical - 5
JavaScript global variable found
941380
Critical - 5
AngularJS client side template injection detected
SQLI - SQL Injection
Expand table
Rule ID
Anomaly score severity
Description
942100
Critical - 5
SQL Injection Attack Detected via libinjection
942110
Warning - 3
SQL Injection Attack: Common Injection Testing Detected
942120
Critical - 5
SQL Injection Attack: SQL Operator Detected
942130
Critical - 5
SQL Injection Attack: SQL Tautology Detected
942140
Critical - 5
SQL Injection Attack: Common DB Names Detected
942150
Critical - 5
SQL Injection Attack
942160
Critical - 5
Detects blind sqli tests using sleep() or benchmark()
942170
Critical - 5
Detects SQL benchmark and sleep injection attempts including conditional queries
942180
Critical - 5
Detects basic SQL authentication bypass attempts 1/3
942190
Critical - 5
Detects MSSQL code execution and information gathering attempts
942200
Critical - 5
Detects MySQL comment-/space-obfuscated injections and backtick termination
942210
Critical - 5
Detects chained SQL injection attempts 1/2
942220
Critical - 5
Looking for integer overflow attacks, these are taken from skipfish, except 3.0.00738585072007e-308 is the "magic number" crash
942230
Critical - 5
Detects conditional SQL injection attempts
942240
Critical - 5
Detects MySQL charset switch and MSSQL DoS attempts
942250
Critical - 5
Detects MATCH AGAINST, MERGE and EXECUTE IMMEDIATE injections
942260
Critical - 5
Detects basic SQL authentication bypass attempts 2/3
942270
Critical - 5
Looking for basic sql injection. Common attack string for mysql, oracle, and others
942280
Critical - 5
Detects Postgres pg_sleep injection, waitfor delay attacks and database shutdown attempts
942290
Critical - 5
Finds basic MongoDB SQL injection attempts
942300
Critical - 5
Detects MySQL comments, conditions, and ch(a)r injections
942310
Critical - 5
Detects chained SQL injection attempts 2/2
942320
Critical - 5
Detects MySQL and PostgreSQL stored procedure/function injections
942330
Critical - 5
Detects classic SQL injection probings 1/2
942340
Critical - 5
Detects basic SQL authentication bypass attempts 3/3
942350
Critical - 5
Detects MySQL UDF injection and other data/structure manipulation attempts
942360
Critical - 5
Detects concatenated basic SQL injection and SQLLFI attempts
942361
Critical - 5
Detects basic SQL injection based on keyword alter or union
942370
Critical - 5
Detects classic SQL injection probings 2/2
942380
Critical - 5
SQL Injection Attack
942390
Critical - 5
SQL Injection Attack
942400
Critical - 5
SQL Injection Attack
942410
Critical - 5
SQL Injection Attack
942430
Warning - 3
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (12)
942440
Critical - 5
SQL Comment Sequence Detected
942450
Critical - 5
SQL Hex Encoding Identified
942470
Critical - 5
SQL Injection Attack
942480
Critical - 5
SQL Injection Attack
942500
Critical - 5
MySQL in-line comment detected
942510
Critical - 5
SQLi bypass attempt by ticks or backticks detected
SESSION-FIXATION
Expand table
Rule ID
Anomaly score severity
Description
943100
Critical - 5
Possible Session Fixation Attack: Setting Cookie Values in HTML
943110
Critical - 5
Possible Session Fixation Attack: SessionID Parameter Name with Off-Domain Referrer
943120
Critical - 5
Possible Session Fixation Attack: SessionID Parameter Name with No Referrer
JAVA Attacks
Expand table
Rule ID
Anomaly score severity
Description
944100
Critical - 5
Remote Command Execution: Apache Struts, Oracle WebLogic
944110
Critical - 5
Detects potential payload execution
944120
Critical - 5
Possible payload execution and remote command execution
944130
Critical - 5
Suspicious Java classes
944200
Critical - 5
Exploitation of Java deserialization Apache Commons
944210
Critical - 5
Possible use of Java serialization
944240
Critical - 5
Remote Command Execution: Java serialization and Log4j vulnerability (CVE-2021-44228 , CVE-2021-45046 )
944250
Critical - 5
Remote Command Execution: Suspicious Java method detected
MS-ThreatIntel-WebShells
Expand table
Rule ID
Anomaly score severity
Description
99005002
Critical - 5
Web Shell Interaction Attempt (POST)
99005003
Critical - 5
Web Shell Upload Attempt (POST) - CHOPPER PHP
99005004
Critical - 5
Web Shell Upload Attempt (POST) - CHOPPER ASPX
99005005
Critical - 5
Web Shell Interaction Attempt
99005006
Critical - 5
Spring4Shell Interaction Attempt
MS-ThreatIntel-AppSec
Expand table
Rule ID
Anomaly score severity
Description
99030001
Critical - 5
Path Traversal Evasion in Headers (/.././../)
99030002
Critical - 5
Path Traversal Evasion in Request Body (/.././../)
MS-ThreatIntel-SQLI
Expand table
Rule ID
Anomaly score severity
Description
99031001
Warning - 3
SQL Injection Attack: Common Injection Testing Detected
99031002
Critical - 5
SQL Comment Sequence Detected
99031003
Critical - 5
SQL Injection Attack
99031004
Critical - 5
Detects basic SQL authentication bypass attempts 2/3
MS-ThreatIntel-CVEs
Expand table
Rule ID
Anomaly score severity
Description
99001001
Critical - 5
Attempted F5 tmui (CVE-2020-5902) REST API Exploitation with known credentials
99001002
Critical - 5
Attempted Citrix NSC_USER directory traversal CVE-2019-19781
99001003
Critical - 5
Attempted Atlassian Confluence Widget Connector exploitation CVE-2019-3396
99001004
Critical - 5
Attempted Pulse Secure custom template exploitation CVE-2020-8243
99001005
Critical - 5
Attempted SharePoint type converter exploitation CVE-2020-0932
99001006
Critical - 5
Attempted Pulse Connect directory traversal CVE-2019-11510
99001007
Critical - 5
Attempted Junos OS J-Web local file inclusion CVE-2020-1631
99001008
Critical - 5
Attempted Fortinet path traversal CVE-2018-13379
99001009
Critical - 5
Attempted Apache struts ognl injection CVE-2017-5638
99001010
Critical - 5
Attempted Apache struts ognl injection CVE-2017-12611
99001011
Critical - 5
Attempted Oracle WebLogic path traversal CVE-2020-14882
99001012
Critical - 5
Attempted Telerik WebUI insecure deserialization exploitation CVE-2019-18935
99001013
Critical - 5
Attempted SharePoint insecure XML deserialization CVE-2019-0604
99001014
Critical - 5
Attempted Spring Cloud routing-expression injection CVE-2022-22963
99001015
Critical - 5
Attempted Spring Framework unsafe class object exploitation CVE-2022-22965
99001016
Critical - 5
Attempted Spring Cloud Gateway Actuator injection CVE-2022-22947
99001017*
N/A
Attempted Apache Struts file upload exploitation CVE-2023-50164
*This rule's action is set to log by default. Set action to Block to prevent against Apache Struts vulnerability. Anomaly Score not supported for this rule.
When reviewing your WAF's logs, you might see rule ID 949110. The description of the rule might include Inbound Anomaly Score Exceeded .
This rule indicates that the total anomaly score for the request exceeded the maximum allowable score. For more information, see Anomaly scoring .
3.2 rule sets
General
Expand table
RuleId
Description
200002
Failed to Parse Request Body
200003
Multipart Request Body Strict Validation
200004
Possible Multipart Unmatched Boundary
KNOWN-CVES
Expand table
RuleId
Description
800100
Rule to help detect and mitigate log4j vulnerability CVE-2021-44228 , CVE-2021-45046
800110
Spring4Shell Interaction Attempt
800111
Attempted Spring Cloud routing-expression injection - CVE-2022-22963
800112
Attempted Spring Framework unsafe class object exploitation - CVE-2022-22965
800113
Attempted Spring Cloud Gateway Actuator injection - CVE-2022-22947
800114*
Attempted Apache Struts file upload exploitation - CVE-2023-50164
*This rule's action is set to log by default. Set action to Block to prevent against Apache Struts vulnerability. Anomaly Score not supported for this rule.
REQUEST-911-METHOD-ENFORCEMENT
Expand table
RuleId
Description
911100
Method isn't allowed by policy
REQUEST-913-SCANNER-DETECTION
Expand table
RuleId
Description
913100
Found User-Agent associated with security scanner
913101
Found User-Agent associated with scripting/generic HTTP client
913102
Found User-Agent associated with web crawler/bot
913110
Found request header associated with security scanner
913120
Found request filename/argument associated with security scanner
REQUEST-920-PROTOCOL-ENFORCEMENT
Expand table
RuleId
Description
920100
Invalid HTTP Request Line
920120
Attempted multipart/form-data bypass
920121
Attempted multipart/form-data bypass
920160
Content-Length HTTP header isn't numeric
920170
GET or HEAD Request with Body Content
920171
GET or HEAD Request with Transfer-Encoding
920180
POST request missing Content-Length Header
920190
Range: Invalid Last Byte Value
920200
Range: Too many fields (6 or more)
920201
Range: Too many fields for pdf request (35 or more)
920202
Range: Too many fields for pdf request (6 or more)
920210
Multiple/Conflicting Connection Header Data Found
920220
URL Encoding Abuse Attack Attempt
920230
Multiple URL Encoding Detected
920240
URL Encoding Abuse Attack Attempt
920250
UTF8 Encoding Abuse Attack Attempt
920260
Unicode Full/Half Width Abuse Attack Attempt
920270
Invalid character in request (null character)
920271
Invalid character in request (non printable characters)
920272
Invalid character in request (outside of printable chars below ascii 127)
920273
Invalid character in request (outside of very strict set)
920274
Invalid character in request headers (outside of very strict set)
920280
Request Missing a Host Header
920290
Empty Host Header
920300
Request Missing an Accept Header
920310
Request Has an Empty Accept Header
920311
Request Has an Empty Accept Header
920320
Missing User Agent Header
920330
Empty User Agent Header
920340
Request Containing Content, but Missing Content-Type header
920341
Request containing content requires Content-Type header
920350
Host header is a numeric IP address
920420
Request content type isn't allowed by policy
920430
HTTP protocol version isn't allowed by policy
920440
URL file extension is restricted by policy
920450
HTTP header is restricted by policy (%{MATCHED_VAR})
920460
Abnormal Escape Characters
920470
Illegal Content-Type header
920480
Restrict charset parameter within the content-type header
REQUEST-921-PROTOCOL-ATTACK
Expand table
RuleId
Description
921110
HTTP Request Smuggling Attack
921120
HTTP Response Splitting Attack
921130
HTTP Response Splitting Attack
921140
HTTP Header Injection Attack via headers
921150
HTTP Header Injection Attack via payload (CR/LF detected)
921151
HTTP Header Injection Attack via payload (CR/LF detected)
921160
HTTP Header Injection Attack via payload (CR/LF and header-name detected)
921170
HTTP Parameter Pollution
921180
HTTP Parameter Pollution (%{TX.1})
REQUEST-930-APPLICATION-ATTACK-LFI
Expand table
RuleId
Description
930100
Path Traversal Attack (/../)
930110
Path Traversal Attack (/../)
930120
OS File Access Attempt
930130
Restricted File Access Attempt
REQUEST-931-APPLICATION-ATTACK-RFI
Expand table
RuleId
Description
931100
Possible Remote File Inclusion (RFI) Attack: URL Parameter using IP Address
931110
Possible Remote File Inclusion (RFI) Attack: Common RFI Vulnerable Parameter Name used w/URL Payload
931120
Possible Remote File Inclusion (RFI) Attack: URL Payload Used w/Trailing Question Mark Character (?)
931130
Possible Remote File Inclusion (RFI) Attack: Off-Domain Reference/Link
REQUEST-932-APPLICATION-ATTACK-RCE
Expand table
RuleId
Description
932100
Remote Command Execution: Unix Command Injection
932105
Remote Command Execution: Unix Command Injection
932106
Remote Command Execution: Unix Command Injection
932110
Remote Command Execution: Windows Command Injection
932115
Remote Command Execution: Windows Command Injection
932120
Remote Command Execution: Windows PowerShell Command Found
932130
Remote Command Execution: Unix Shell Expression or Confluence Vulnerability (CVE-2022-26134) or Text4Shell (CVE-2022-42889 ) Found
932140
Remote Command Execution: Windows FOR/IF Command Found
932150
Remote Command Execution: Direct Unix Command Execution
932160
Remote Command Execution: Unix Shell Code Found
932170
Remote Command Execution: Shellshock (CVE-2014-6271)
932171
Remote Command Execution: Shellshock (CVE-2014-6271)
932180
Restricted File Upload Attempt
932190
Remote Command Execution: Wildcard bypass technique attempt
REQUEST-933-APPLICATION-ATTACK-PHP
Expand table
RuleId
Description
933100
PHP Injection Attack: Opening/Closing Tag Found
933110
PHP Injection Attack: PHP Script File Upload Found
933111
PHP Injection Attack: PHP Script File Upload Found
933120
PHP Injection Attack: Configuration Directive Found
933130
PHP Injection Attack: Variables Found
933131
PHP Injection Attack: Variables Found
933140
PHP Injection Attack: I/O Stream Found
933150
PHP Injection Attack: High-Risk PHP Function Name Found
933151
PHP Injection Attack: Medium-Risk PHP Function Name Found
933160
PHP Injection Attack: High-Risk PHP Function Call Found
933161
PHP Injection Attack: Low-Value PHP Function Call Found
933170
PHP Injection Attack: Serialized Object Injection
933180
PHP Injection Attack: Variable Function Call Found
933190
PHP Injection Attack: PHP Closing Tag Found
933200
PHP Injection Attack: Wrapper scheme detected
933210
PHP Injection Attack: Variable Function Call Found
REQUEST-941-APPLICATION-ATTACK-XSS
Expand table
RuleId
Description
941100
XSS Attack Detected via libinjection
941101
XSS Attack Detected via libinjection Referer header
941110
XSS Filter - Category 1: Script Tag Vector
941120
XSS Filter - Category 2: Event Handler Vector
941130
XSS Filter - Category 3: Attribute Vector
941140
XSS Filter - Category 4: JavaScript URI Vector
941150
XSS Filter - Category 5: Disallowed HTML Attributes
941160
NoScript XSS InjectionChecker: HTML Injection
941170
NoScript XSS InjectionChecker: Attribute Injection
941180
Node-Validator Blacklist Keywords
941190
XSS Using style sheets
941200
XSS using VML frames
941210
XSS using obfuscated JavaScript or Text4Shell (CVE-2022-42889 )
941220
XSS using obfuscated VB Script
941230
XSS using 'embed' tag
941240
XSS using 'import' or 'implementation' attribute
941250
IE XSS Filters - Attack Detected
941260
XSS using 'meta' tag
941270
XSS using 'link' href
941280
XSS using 'base' tag
941290
XSS using 'applet' tag
941300
XSS using 'object' tag
941310
US-ASCII Malformed Encoding XSS Filter - Attack Detected
941320
Possible XSS Attack Detected - HTML Tag Handler
941330
IE XSS Filters - Attack Detected
941340
IE XSS Filters - Attack Detected
941350
UTF-7 Encoding IE XSS - Attack Detected
941360
JavaScript obfuscation detected
REQUEST-942-APPLICATION-ATTACK-SQLI
Expand table
RuleId
Description
942100
SQL Injection Attack Detected via libinjection
942110
SQL Injection Attack: Common Injection Testing Detected
942120
SQL Injection Attack: SQL Operator Detected
942130
SQL Injection Attack: SQL Tautology Detected
942140
SQL Injection Attack: Common DB Names Detected
942150
SQL Injection Attack
942160
Detects blind sqli tests using sleep() or benchmark()
942170
Detects SQL benchmark and sleep injection attempts including conditional queries
942180
Detects basic SQL authentication bypass attempts 1/3
942190
Detects MSSQL code execution and information gathering attempts
942200
Detects MySQL comment-/space-obfuscated injections and backtick termination
942210
Detects chained SQL injection attempts 1/2
942220
Looking for integer overflow attacks, these are taken from skipfish, except 3.0.00738585072007e-308 is the "magic number" crash
942230
Detects conditional SQL injection attempts
942240
Detects MySQL charset switch and MSSQL DoS attempts
942250
Detects MATCH AGAINST, MERGE, and EXECUTE IMMEDIATE injections
942251
Detects HAVING injections
942260
Detects basic SQL authentication bypass attempts 2/3
942270
Looking for basic sql injection. Common attack string for mysql, oracle, and others
942280
Detects Postgres pg_sleep injection, waitfor delay attacks and database shutdown attempts
942290
Finds basic MongoDB SQL injection attempts
942300
Detects MySQL comments, conditions, and ch(a)r injections
942310
Detects chained SQL injection attempts 2/2
942320
Detects MySQL and PostgreSQL stored procedure/function injections
942330
Detects classic SQL injection probings 1/2
942340
Detects basic SQL authentication bypass attempts 3/3
942350
Detects MySQL UDF injection and other data/structure manipulation attempts
942360
Detects concatenated basic SQL injection and SQLLFI attempts
942361
Detects basic SQL injection based on keyword alter or union
942370
Detects classic SQL injection probings 2/2
942380
SQL Injection Attack
942390
SQL Injection Attack
942400
SQL Injection Attack
942410
SQL Injection Attack
942420
Restricted SQL Character Anomaly Detection (cookies): # of special characters exceeded (8)
942421
Restricted SQL Character Anomaly Detection (cookies): # of special characters exceeded (3)
942430
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (12)
942431
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (6)
942432
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (2)
942440
SQL Comment Sequence Detected
942450
SQL Hex Encoding Identified
942460
Meta-Character Anomaly Detection Alert - Repetitive Non-Word Characters
942470
SQL Injection Attack
942480
SQL Injection Attack
942490
Detects classic SQL injection probings 3/3
942500
MySQL in-line comment detected
REQUEST-943-APPLICATION-ATTACK-SESSION-FIXATION
Expand table
RuleId
Description
943100
Possible Session Fixation Attack: Setting Cookie Values in HTML
943110
Possible Session Fixation Attack: SessionID Parameter Name with Off-Domain Referer
943120
Possible Session Fixation Attack: SessionID Parameter Name with No Referer
REQUEST-944-APPLICATION-ATTACK-JAVA
Expand table
RuleId
Description
944100
Remote Command Execution: Apache Struts, Oracle WebLogic
944110
Detects potential payload execution
944120
Possible payload execution and remote command execution
944130
Suspicious Java classes
944200
Exploitation of Java deserialization Apache Commons
944210
Possible use of Java serialization
944240
Remote Command Execution: Java serialization
944250
Remote Command Execution: Suspicious Java method detected
3.1 rule sets
General
Expand table
RuleId
Description
200004
Possible Multipart Unmatched Boundary
KNOWN-CVES
Expand table
RuleId
Description
800100
Rule to help detect and mitigate log4j vulnerability CVE-2021-44228 , CVE-2021-45046
800110
Spring4Shell Interaction Attempt
800111
Attempted Spring Cloud routing-expression injection - CVE-2022-22963
800112
Attempted Spring Framework unsafe class object exploitation - CVE-2022-22965
800113
Attempted Spring Cloud Gateway Actuator injection - CVE-2022-22947
800114*
Attempted Apache Struts file upload exploitation - CVE-2023-50164
*Older WAFs running CRS 3.1 only support logging mode for this rule. To enable block mode you will need to upgrade to a newer ruleset version.
REQUEST-911-METHOD-ENFORCEMENT
Expand table
RuleId
Description
911100
Method isn't allowed by policy
REQUEST-913-SCANNER-DETECTION
Expand table
RuleId
Description
913100
Found User-Agent associated with security scanner
913101
Found User-Agent associated with scripting/generic HTTP client
913102
Found User-Agent associated with web crawler/bot
913110
Found request header associated with security scanner
913120
Found request filename/argument associated with security scanner
REQUEST-920-PROTOCOL-ENFORCEMENT
Expand table
RuleId
Description
920100
Invalid HTTP Request Line
920120
Attempted multipart/form-data bypass
920121
Attempted multipart/form-data bypass
920130
Failed to parse request body
920140
Multipart request body failed strict validation
920160
Content-Length HTTP header isn't numeric
920170
GET or HEAD Request with Body Content
920171
GET or HEAD Request with Transfer-Encoding
920180
POST request missing Content-Length Header
920190
Range = Invalid Last Byte Value
920200
Range = Too many fields (6 or more)
920201
Range = Too many fields for pdf request (35 or more)
920202
Range = Too many fields for pdf request (6 or more)
920210
Multiple/Conflicting Connection Header Data Found
920220
URL Encoding Abuse Attack Attempt
920230
Multiple URL Encoding Detected
920240
URL Encoding Abuse Attack Attempt
920250
UTF8 Encoding Abuse Attack Attempt
920260
Unicode Full/Half Width Abuse Attack Attempt
920270
Invalid character in request (null character)
920271
Invalid character in request (non printable characters)
920272
Invalid character in request (outside of printable chars below ascii 127)
920273
Invalid character in request (outside of very strict set)
920274
Invalid character in request headers (outside of very strict set)
920280
Request Missing a Host Header
920290
Empty Host Header
920300
Request Missing an Accept Header
920310
Request Has an Empty Accept Header
920311
Request Has an Empty Accept Header
920320
Missing User Agent Header
920330
Empty User Agent Header
920340
Request Containing Content but Missing Content-Type header
920341
Request containing content requires Content-Type header
920350
Host header is a numeric IP address
920420
Request content type isn't allowed by policy
920430
HTTP protocol version isn't allowed by policy
920440
URL file extension is restricted by policy
920450
HTTP header is restricted by policy (%@{MATCHED_VAR})
920460
Abnormal Escape Characters
920470
Illegal Content-Type header
920480
Restrict charset parameter within the content-type header
REQUEST-921-PROTOCOL-ATTACK
Expand table
RuleId
Description
921110
HTTP Request Smuggling Attack
921120
HTTP Response Splitting Attack
921130
HTTP Response Splitting Attack
921140
HTTP Header Injection Attack via headers
921150
HTTP Header Injection Attack via payload (CR/LF detected)
921151
HTTP Header Injection Attack via payload (CR/LF detected)
921160
HTTP Header Injection Attack via payload (CR/LF and header-name detected)
921170
HTTP Parameter Pollution
921180
HTTP Parameter Pollution (%{TX.1})
REQUEST-930-APPLICATION-ATTACK-LFI
Expand table
RuleId
Description
930100
Path Traversal Attack (/../)
930110
Path Traversal Attack (/../)
930120
OS File Access Attempt
930130
Restricted File Access Attempt
REQUEST-931-APPLICATION-ATTACK-RFI
Expand table
RuleId
Description
931100
Possible Remote File Inclusion (RFI) Attack = URL Parameter using IP Address
931110
Possible Remote File Inclusion (RFI) Attack = Common RFI Vulnerable Parameter Name used w/URL Payload
931120
Possible Remote File Inclusion (RFI) Attack = URL Payload Used w/Trailing Question Mark Character (?)
931130
Possible Remote File Inclusion (RFI) Attack = Off-Domain Reference/Link
REQUEST-932-APPLICATION-ATTACK-RCE
Expand table
RuleId
Description
932100
Remote Command Execution: Unix Command Injection
932105
Remote Command Execution: Unix Command Injection
932106
Remote Command Execution: Unix Command Injection
932110
Remote Command Execution: Windows Command Injection
932115
Remote Command Execution: Windows Command Injection
932120
Remote Command Execution = Windows PowerShell Command Found
932130
Remote Command Execution: Unix Shell Expression or Confluence Vulnerability (CVE-2022-26134) or Text4Shell (CVE-2022-42889 ) Found
932140
Remote Command Execution = Windows FOR/IF Command Found
932150
Remote Command Execution: Direct Unix Command Execution
932160
Remote Command Execution = Unix Shell Code Found
932170
Remote Command Execution = Shellshock (CVE-2014-6271)
932171
Remote Command Execution = Shellshock (CVE-2014-6271)
932180
Restricted File Upload Attempt
932190
Remote Command Execution: Wildcard bypass technique attempt
REQUEST-933-APPLICATION-ATTACK-PHP
Expand table
RuleId
Description
933100
PHP Injection Attack = Opening/Closing Tag Found
933110
PHP Injection Attack = PHP Script File Upload Found
933111
PHP Injection Attack: PHP Script File Upload Found
933120
PHP Injection Attack = Configuration Directive Found
933130
PHP Injection Attack = Variables Found
933131
PHP Injection Attack: Variables Found
933140
PHP Injection Attack: I/O Stream Found
933150
PHP Injection Attack = High-Risk PHP Function Name Found
933151
PHP Injection Attack: Medium-Risk PHP Function Name Found
933160
PHP Injection Attack = High-Risk PHP Function Call Found
933161
PHP Injection Attack: Low-Value PHP Function Call Found
933170
PHP Injection Attack: Serialized Object Injection
933180
PHP Injection Attack = Variable Function Call Found
933190
PHP Injection Attack: PHP Closing Tag Found
REQUEST-941-APPLICATION-ATTACK-XSS
Expand table
RuleId
Description
941100
XSS Attack Detected via libinjection
941101
XSS Attack Detected via libinjection.Referer header
941110
XSS Filter - Category 1 = Script Tag Vector
941130
XSS Filter - Category 3 = Attribute Vector
941140
XSS Filter - Category 4 = JavaScript URI Vector
941150
XSS Filter - Category 5 = Disallowed HTML Attributes
941160
NoScript XSS InjectionChecker: HTML Injection
941170
NoScript XSS InjectionChecker: Attribute Injection
941180
Node-Validator Blocklist Keywords
941190
XSS using style sheets
941200
XSS using VML frames
941210
XSS using obfuscated JavaScript or Text4Shell (CVE-2022-42889 )
941220
XSS using obfuscated VB Script
941230
XSS using 'embed' tag
941240
XSS using 'import' or 'implementation' attribute
941250
IE XSS Filters - Attack Detected
941260
XSS using 'meta' tag
941270
XSS using 'link' href
941280
XSS using 'base' tag
941290
XSS using 'applet' tag
941300
XSS using 'object' tag
941310
US-ASCII Malformed Encoding XSS Filter - Attack Detected
941320
Possible XSS Attack Detected - HTML Tag Handler
941330
IE XSS Filters - Attack Detected
941340
IE XSS Filters - Attack Detected
941350
UTF-7 Encoding IE XSS - Attack Detected
REQUEST-942-APPLICATION-ATTACK-SQLI
Expand table
RuleId
Description
942100
SQL Injection Attack Detected via libinjection
942110
SQL Injection Attack: Common Injection Testing Detected
942120
SQL Injection Attack: SQL Operator Detected
942130
SQL Injection Attack: SQL Tautology Detected
942140
SQL Injection Attack = Common DB Names Detected
942150
SQL Injection Attack
942160
Detects blind sqli tests using sleep() or benchmark()
942170
Detects SQL benchmark and sleep injection attempts including conditional queries
942180
Detects basic SQL authentication bypass attempts 1/3
942190
Detects MSSQL code execution and information gathering attempts
942200
Detects MySQL comment-/space-obfuscated injections and backtick termination
942210
Detects chained SQL injection attempts 1/2
942220
Looking for integer overflow attacks, these are taken from skipfish, except 3.0.00738585072
942230
Detects conditional SQL injection attempts
942240
Detects MySQL charset switch and MSSQL DoS attempts
942250
Detects MATCH AGAINST, MERGE, and EXECUTE IMMEDIATE injections
942251
Detects HAVING injections
942260
Detects basic SQL authentication bypass attempts 2/3
942270
Looking for basic sql injection. Common attack string for mysql oracle and others
942280
Detects Postgres pg_sleep injection, waitfor delay attacks and database shutdown attempts
942290
Finds basic MongoDB SQL injection attempts
942300
Detects MySQL comments, conditions, and ch(a)r injections
942310
Detects chained SQL injection attempts 2/2
942320
Detects MySQL and PostgreSQL stored procedure/function injections
942330
Detects classic SQL injection probings 1/2
942340
Detects basic SQL authentication bypass attempts 3/3
942350
Detects MySQL UDF injection and other data/structure manipulation attempts
942360
Detects concatenated basic SQL injection and SQLLFI attempts
942361
Detects basic SQL injection based on keyword alter or union
942370
Detects classic SQL injection probings 2/2
942380
SQL Injection Attack
942390
SQL Injection Attack
942400
SQL Injection Attack
942410
SQL Injection Attack
942420
Restricted SQL Character Anomaly Detection (cookies): # of special characters exceeded (8)
942421
Restricted SQL Character Anomaly Detection (cookies): # of special characters exceeded (3)
942430
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (12)
942431
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (6)
942432
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (2)
942440
SQL Comment Sequence Detected
942450
SQL Hex Encoding Identified
942460
Meta-Character Anomaly Detection Alert - Repetitive Non-Word Characters
942470
SQL Injection Attack
942480
SQL Injection Attack
942490
Detects classic SQL injection probings 3/3
REQUEST-943-APPLICATION-ATTACK-SESSION-FIXATION
Expand table
RuleId
Description
943100
Possible Session Fixation Attack = Setting Cookie Values in HTML
943110
Possible Session Fixation Attack = SessionID Parameter Name with Off-Domain Referrer
943120
Possible Session Fixation Attack = SessionID Parameter Name with No Referrer
REQUEST-944-APPLICATION-ATTACK-SESSION-JAVA
Expand table
RuleId
Description
944120
Possible payload execution and remote command execution
944130
Suspicious Java classes
944200
Exploitation of Java deserialization Apache Commons
1.0 rule sets
Bad bots
Expand table
RuleId
Description
Bot100100
Malicious bots detected by threat intelligence
Bot100200
Malicious bots that have falsified their identity
Bot100100 scans both client IP addresses and IPs in the X-Forwarded-For header.
Good bots
Expand table
RuleId
Description
Bot200100
Search engine crawlers
Bot200200
Unverified search engine crawlers
Unknown bots
Expand table
RuleId
Description
Bot300100
Unspecified identity
Bot300200
Tools and frameworks for web crawling and attacks
Bot300300
General-purpose HTTP clients and SDKs
Bot300400
Service agents
Bot300500
Site health monitoring services
Bot300600
Unknown bots detected by threat intelligence
Bot300700
Other bots
Bot300600 scans both client IP addresses and IPs in the X-Forwarded-For header.
1.1 rule sets
Bad bots
Expand table
RuleId
Description
Bot100100
Malicious bots detected by threat intelligence
Bot100200
Malicious bots that have falsified their identity
Bot100300
High risk bots detected by threat intelligence
Bot100100 scans both client IP addresses and IPs in the X-Forwarded-For header.
Good bots
Expand table
RuleId
Description
Bot200100
Search engine crawlers
Bot200200
Verified miscellaneous bots
Bot200300
Verified link checker bots
Bot200400
Verified social media bots
Bot200500
Verified content fetchers
Bot200600
Verified feed fetchers
Bot200700
Verified advertising bots
Unknown bots
Expand table
RuleId
Description
Bot300100
Unspecified identity
Bot300200
Tools and frameworks for web crawling and attacks
Bot300300
General-purpose HTTP clients and SDKs
Bot300400
Service agents
Bot300500
Site health monitoring services
Bot300600
Unknown bots detected by threat intelligence. This rule also includes IP addresses matched to the Tor network
Bot300700
Other bots
Bot300600 scans both client IP addresses and IPs in the X-Forwarded-For header.
The following rule groups and rules are no longer supported on Web Application Firewall on Application Gateway.
CRS 3.0 and CRS 2.2.9 are no longer supported in Azure WAF. We recommend you upgrade to DRS 2.1 / CRS 3.2
3.0 rule sets
General
Expand table
RuleId
Description
200004
Possible Multipart Unmatched Boundary
KNOWN-CVES
Expand table
RuleId
Description
800100
Rule to help detect and mitigate log4j vulnerability CVE-2021-44228 , CVE-2021-45046
800110
Spring4Shell Interaction Attempt
800111
Attempted Spring Cloud routing-expression injection - CVE-2022-22963
800112
Attempted Spring Framework unsafe class object exploitation - CVE-2022-22965
800113
Attempted Spring Cloud Gateway Actuator injection - CVE-2022-22947
REQUEST-911-METHOD-ENFORCEMENT
Expand table
RuleId
Description
911100
Method isn't allowed by policy
REQUEST-913-SCANNER-DETECTION
Expand table
RuleId
Description
913100
Found User-Agent associated with security scanner
913110
Found request header associated with security scanner
913120
Found request filename/argument associated with security scanner
913101
Found User-Agent associated with scripting/generic HTTP client
913102
Found User-Agent associated with web crawler/bot
REQUEST-920-PROTOCOL-ENFORCEMENT
Expand table
RuleId
Description
920100
Invalid HTTP Request Line
920130
Failed to parse request body
920140
Multipart request body failed strict validation
920160
Content-Length HTTP header isn't numeric
920170
GET or HEAD Request with Body Content
920180
POST request missing Content-Length Header
920190
Range = Invalid Last Byte Value
920210
Multiple/Conflicting Connection Header Data Found
920220
URL Encoding Abuse Attack Attempt
920240
URL Encoding Abuse Attack Attempt
920250
UTF8 Encoding Abuse Attack Attempt
920260
Unicode Full/Half Width Abuse Attack Attempt
920270
Invalid character in request (null character)
920280
Request Missing a Host Header
920290
Empty Host Header
920310
Request Has an Empty Accept Header
920311
Request Has an Empty Accept Header
920330
Empty User Agent Header
920340
Request Containing Content but Missing Content-Type header
920350
Host header is a numeric IP address
920380
Too many arguments in request
920360
Argument name too long
920370
Argument value too long
920390
Total arguments size exceeded
920400
Uploaded file size too large
920410
Total uploaded files size too large
920420
Request content type isn't allowed by policy
920430
HTTP protocol version isn't allowed by policy
920440
URL file extension is restricted by policy
920450
HTTP header is restricted by policy (%@{MATCHED_VAR})
920200
Range = Too many fields (6 or more)
920201
Range = Too many fields for pdf request (35 or more)
920230
Multiple URL Encoding Detected
920300
Request Missing an Accept Header
920271
Invalid character in request (non printable characters)
920320
Missing User Agent Header
920272
Invalid character in request (outside of printable chars below ascii 127)
920202
Range = Too many fields for pdf request (6 or more)
920273
Invalid character in request (outside of very strict set)
920274
Invalid character in request headers (outside of very strict set)
920460
Abnormal escape characters
REQUEST-921-PROTOCOL-ATTACK
Expand table
RuleId
Description
921100
HTTP Request Smuggling Attack
921110
HTTP Request Smuggling Attack
921120
HTTP Response Splitting Attack
921130
HTTP Response Splitting Attack
921140
HTTP Header Injection Attack via headers
921150
HTTP Header Injection Attack via payload (CR/LF detected)
921160
HTTP Header Injection Attack via payload (CR/LF and header-name detected)
921151
HTTP Header Injection Attack via payload (CR/LF detected)
921170
HTTP Parameter Pollution
921180
HTTP Parameter Pollution (%@{TX.1})
REQUEST-930-APPLICATION-ATTACK-LFI
Expand table
RuleId
Description
930100
Path Traversal Attack (/../)
930110
Path Traversal Attack (/../)
930120
OS File Access Attempt
930130
Restricted File Access Attempt
REQUEST-931-APPLICATION-ATTACK-RFI
Expand table
RuleId
Description
931100
Possible Remote File Inclusion (RFI) Attack = URL Parameter using IP Address
931110
Possible Remote File Inclusion (RFI) Attack = Common RFI Vulnerable Parameter Name used w/URL Payload
931120
Possible Remote File Inclusion (RFI) Attack = URL Payload Used w/Trailing Question Mark Character (?)
931130
Possible Remote File Inclusion (RFI) Attack = Off-Domain Reference/Link
REQUEST-932-APPLICATION-ATTACK-RCE
Expand table
RuleId
Description
932120
Remote Command Execution = Windows PowerShell Command Found
932130
Application Gateway WAF v2 : Remote Command Execution: Unix Shell Expression or Confluence Vulnerability (CVE-2022-26134) or Text4Shell (CVE-2022-42889 ) FoundApplication Gateway WAF v1 : Remote Command Execution: Unix Shell Expression
932140
Remote Command Execution = Windows FOR/IF Command Found
932160
Remote Command Execution = Unix Shell Code Found
932170
Remote Command Execution = Shellshock (CVE-2014-6271)
932171
Remote Command Execution = Shellshock (CVE-2014-6271)
REQUEST-933-APPLICATION-ATTACK-PHP
Expand table
RuleId
Description
933100
PHP Injection Attack = Opening/Closing Tag Found
933110
PHP Injection Attack = PHP Script File Upload Found
933120
PHP Injection Attack = Configuration Directive Found
933130
PHP Injection Attack = Variables Found
933150
PHP Injection Attack = High-Risk PHP Function Name Found
933160
PHP Injection Attack = High-Risk PHP Function Call Found
933180
PHP Injection Attack = Variable Function Call Found
933151
PHP Injection Attack = Medium-Risk PHP Function Name Found
933131
PHP Injection Attack = Variables Found
933161
PHP Injection Attack = Low-Value PHP Function Call Found
933111
PHP Injection Attack = PHP Script File Upload Found
REQUEST-941-APPLICATION-ATTACK-XSS
Expand table
RuleId
Description
941100
XSS Attack Detected via libinjection
941110
XSS Filter - Category 1 = Script Tag Vector
941130
XSS Filter - Category 3 = Attribute Vector
941140
XSS Filter - Category 4 = JavaScript URI Vector
941150
XSS Filter - Category 5 = Disallowed HTML Attributes
941180
Node-Validator Blocklist Keywords
941190
XSS using style sheets
941200
XSS using VML frames
941210
XSS using obfuscated JavaScript or Text4Shell (CVE-2022-42889 )
941220
XSS using obfuscated VB Script
941230
XSS using 'embed' tag
941240
XSS using 'import' or 'implementation' attribute
941260
XSS using 'meta' tag
941270
XSS using 'link' href
941280
XSS using 'base' tag
941290
XSS using 'applet' tag
941300
XSS using 'object' tag
941310
US-ASCII Malformed Encoding XSS Filter - Attack Detected
941330
IE XSS Filters - Attack Detected
941340
IE XSS Filters - Attack Detected
941350
UTF-7 Encoding IE XSS - Attack Detected
941320
Possible XSS Attack Detected - HTML Tag Handler
REQUEST-942-APPLICATION-ATTACK-SQLI
Expand table
RuleId
Description
942100
SQL Injection Attack Detected via libinjection
942110
SQL Injection Attack: Common Injection Testing Detected
942130
SQL Injection Attack: SQL Tautology Detected
942140
SQL Injection Attack = Common DB Names Detected
942160
Detects blind sqli tests using sleep() or benchmark()
942170
Detects SQL benchmark and sleep injection attempts including conditional queries
942190
Detects MSSQL code execution and information gathering attempts
942200
Detects MySQL comment-/space-obfuscated injections and backtick termination
942230
Detects conditional SQL injection attempts
942260
Detects basic SQL authentication bypass attempts 2/3
942270
Looking for basic sql injection. Common attack string for mysql oracle and others
942290
Finds basic MongoDB SQL injection attempts
942300
Detects MySQL comments, conditions and ch(a)r injections
942310
Detects chained SQL injection attempts 2/2
942320
Detects MySQL and PostgreSQL stored procedure/function injections
942330
Detects classic SQL injection probings 1/2
942340
Detects basic SQL authentication bypass attempts 3/3
942350
Detects MySQL UDF injection and other data/structure manipulation attempts
942360
Detects concatenated basic SQL injection and SQLLFI attempts
942370
Detects classic SQL injection probings 2/2
942150
SQL Injection Attack
942410
SQL Injection Attack
942430
Restricted SQL Character Anomaly Detection (args): # of special characters exceeded (12)
942440
SQL Comment Sequence Detected
942450
SQL Hex Encoding Identified
942251
Detects HAVING injections
942460
Meta-Character Anomaly Detection Alert - Repetitive Non-Word Characters
REQUEST-943-APPLICATION-ATTACK-SESSION-FIXATION
Expand table
RuleId
Description
943100
Possible Session Fixation Attack = Setting Cookie Values in HTML
943110
Possible Session Fixation Attack = SessionID Parameter Name with Off-Domain Referrer
943120
Possible Session Fixation Attack = SessionID Parameter Name with No Referrer
2.2.9 rule sets
crs_20_protocol_violations
Expand table
RuleId
Description
960911
Invalid HTTP Request Line
981227
Apache Error = Invalid URI in Request
960912
Failed to parse request body
960914
Multipart request body failed strict validation
960915
Multipart parser detected a possible unmatched boundary
960016
Content-Length HTTP header isn't numeric
960011
GET or HEAD Request with Body Content
960012
POST request missing Content-Length Header
960902
Invalid Use of Identity Encoding
960022
Expect Header Not Allowed for HTTP 1.0
960020
Pragma Header requires Cache-Control Header for HTTP/1.1 requests
958291
Range = field exists and begins with 0
958230
Range = Invalid Last Byte Value
958295
Multiple/Conflicting Connection Header Data Found
950107
URL Encoding Abuse Attack Attempt
950109
Multiple URL Encoding Detected
950108
URL Encoding Abuse Attack Attempt
950801
UTF8 Encoding Abuse Attack Attempt
950116
Unicode Full/Half Width Abuse Attack Attempt
960901
Invalid character in request
960018
Invalid character in request
crs_21_protocol_anomalies
Expand table
RuleId
Description
960008
Request Missing a Host Header
960007
Empty Host Header
960015
Request Missing an Accept Header
960021
Request Has an Empty Accept Header
960009
Request Missing a User Agent Header
960006
Empty User Agent Header
960904
Request Containing Content but Missing Content-Type header
960017
Host header is a numeric IP address
crs_23_request_limits
Expand table
RuleId
Description
960209
Argument name too long
960208
Argument value too long
960335
Too many arguments in request
960341
Total arguments size exceeded
960342
Uploaded file size too large
960343
Total uploaded files size too large
crs_30_http_policy
Expand table
RuleId
Description
960032
Method isn't allowed by policy
960010
Request content type isn't allowed by policy
960034
HTTP protocol version isn't allowed by policy
960035
URL file extension is restricted by policy
960038
HTTP header is restricted by policy
crs_35_bad_robots
Expand table
RuleId
Description
990002
Request Indicates a Security Scanner Scanned the Site
990901
Request Indicates a Security Scanner Scanned the Site
990902
Request Indicates a Security Scanner Scanned the Site
990012
Rogue web site crawler
crs_40_generic_attacks
Expand table
RuleId
Description
960024
Meta-Character Anomaly Detection Alert - Repetitive Non-Word Characters
950008
Injection of Undocumented ColdFusion Tags
950010
LDAP Injection Attack
950011
SSI injection Attack
950018
Universal PDF XSS URL Detected
950019
Email Injection Attack
950012
HTTP Request Smuggling Attack
950910
HTTP Response Splitting Attack
950911
HTTP Response Splitting Attack
950117
Remote File Inclusion Attack
950118
Remote File Inclusion Attack
950119
Remote File Inclusion Attack
950120
Possible Remote File Inclusion (RFI) Attack = Off-Domain Reference/Link
981133
Rule 981133
981134
Rule 981134
950009
Session Fixation Attack
950003
Session Fixation
950000
Session Fixation
950005
Remote File Access Attempt
950002
System Command Access
950006
System Command Injection
959151
PHP Injection Attack
958976
PHP Injection Attack
958977
PHP Injection Attack
crs_41_sql_injection_attacks
Expand table
RuleId
Description
981231
SQL Comment Sequence Detected
981260
SQL Hex Encoding Identified
981320
SQL Injection Attack = Common DB Names Detected
981300
Rule 981300
981301
Rule 981301
981302
Rule 981302
981303
Rule 981303
981304
Rule 981304
981305
Rule 981305
981306
Rule 981306
981307
Rule 981307
981308
Rule 981308
981309
Rule 981309
981310
Rule 981310
981311
Rule 981311
981312
Rule 981312
981313
Rule 981313
981314
Rule 981314
981315
Rule 981315
981316
Rule 981316
981317
SQL SELECT Statement Anomaly Detection Alert
950007
Blind SQL Injection Attack
950001
SQL Injection Attack
950908
SQL Injection Attack
959073
SQL Injection Attack
981272
Detects blind sqli tests using sleep() or benchmark()
981250
Detects SQL benchmark and sleep injection attempts including conditional queries
981241
Detects conditional SQL injection attempts
981276
Looking for basic sql injection. Common attack string for mysql oracle and others
981270
Finds basic MongoDB SQL injection attempts
981253
Detects MySQL and PostgreSQL stored procedure/function injections
981251
Detects MySQL UDF injection and other data/structure manipulation attempts
crs_41_xss_attacks
Expand table
RuleId
Description
973336
XSS Filter - Category 1 = Script Tag Vector
973338
XSS Filter - Category 3 = JavaScript URI Vector
981136
Rule 981136
981018
Rule 981018
958016
Cross-site Scripting (XSS) Attack
958414
Cross-site Scripting (XSS) Attack
958032
Cross-site Scripting (XSS) Attack
958026
Cross-site Scripting (XSS) Attack
958027
Cross-site Scripting (XSS) Attack
958054
Cross-site Scripting (XSS) Attack
958418
Cross-site Scripting (XSS) Attack
958034
Cross-site Scripting (XSS) Attack
958019
Cross-site Scripting (XSS) Attack
958013
Cross-site Scripting (XSS) Attack
958408
Cross-site Scripting (XSS) Attack
958012
Cross-site Scripting (XSS) Attack
958423
Cross-site Scripting (XSS) Attack
958002
Cross-site Scripting (XSS) Attack
958017
Cross-site Scripting (XSS) Attack
958007
Cross-site Scripting (XSS) Attack
958047
Cross-site Scripting (XSS) Attack
958410
Cross-site Scripting (XSS) Attack
958415
Cross-site Scripting (XSS) Attack
958022
Cross-site Scripting (XSS) Attack
958405
Cross-site Scripting (XSS) Attack
958419
Cross-site Scripting (XSS) Attack
958028
Cross-site Scripting (XSS) Attack
958057
Cross-site Scripting (XSS) Attack
958031
Cross-site Scripting (XSS) Attack
958006
Cross-site Scripting (XSS) Attack
958033
Cross-site Scripting (XSS) Attack
958038
Cross-site Scripting (XSS) Attack
958409
Cross-site Scripting (XSS) Attack
958001
Cross-site Scripting (XSS) Attack
958005
Cross-site Scripting (XSS) Attack
958404
Cross-site Scripting (XSS) Attack
958023
Cross-site Scripting (XSS) Attack
958010
Cross-site Scripting (XSS) Attack
958411
Cross-site Scripting (XSS) Attack
958422
Cross-site Scripting (XSS) Attack
958036
Cross-site Scripting (XSS) Attack
958000
Cross-site Scripting (XSS) Attack
958018
Cross-site Scripting (XSS) Attack
958406
Cross-site Scripting (XSS) Attack
958040
Cross-site Scripting (XSS) Attack
958052
Cross-site Scripting (XSS) Attack
958037
Cross-site Scripting (XSS) Attack
958049
Cross-site Scripting (XSS) Attack
958030
Cross-site Scripting (XSS) Attack
958041
Cross-site Scripting (XSS) Attack
958416
Cross-site Scripting (XSS) Attack
958024
Cross-site Scripting (XSS) Attack
958059
Cross-site Scripting (XSS) Attack
958417
Cross-site Scripting (XSS) Attack
958020
Cross-site Scripting (XSS) Attack
958045
Cross-site Scripting (XSS) Attack
958004
Cross-site Scripting (XSS) Attack
958421
Cross-site Scripting (XSS) Attack
958009
Cross-site Scripting (XSS) Attack
958025
Cross-site Scripting (XSS) Attack
958413
Cross-site Scripting (XSS) Attack
958051
Cross-site Scripting (XSS) Attack
958420
Cross-site Scripting (XSS) Attack
958407
Cross-site Scripting (XSS) Attack
958056
Cross-site Scripting (XSS) Attack
958011
Cross-site Scripting (XSS) Attack
958412
Cross-site Scripting (XSS) Attack
958008
Cross-site Scripting (XSS) Attack
958046
Cross-site Scripting (XSS) Attack
958039
Cross-site Scripting (XSS) Attack
958003
Cross-site Scripting (XSS) Attack
973300
Possible XSS Attack Detected - HTML Tag Handler
973301
XSS Attack Detected
973302
XSS Attack Detected
973303
XSS Attack Detected
973304
XSS Attack Detected
973305
XSS Attack Detected
973306
XSS Attack Detected
973307
XSS Attack Detected
973308
XSS Attack Detected
973309
XSS Attack Detected
973311
XSS Attack Detected
973313
XSS Attack Detected
973314
XSS Attack Detected
973331
IE XSS Filters - Attack Detected
973315
IE XSS Filters - Attack Detected
973330
IE XSS Filters - Attack Detected
973327
IE XSS Filters - Attack Detected
973326
IE XSS Filters - Attack Detected
973346
IE XSS Filters - Attack Detected
973345
IE XSS Filters - Attack Detected
973324
IE XSS Filters - Attack Detected
973323
IE XSS Filters - Attack Detected
973348
IE XSS Filters - Attack Detected
973321
IE XSS Filters - Attack Detected
973320
IE XSS Filters - Attack Detected
973318
IE XSS Filters - Attack Detected
973317
IE XSS Filters - Attack Detected
973329
IE XSS Filters - Attack Detected
973328
IE XSS Filters - Attack Detected
crs_42_tight_security
Expand table
RuleId
Description
950103
Path Traversal Attack
crs_45_trojans
Expand table
RuleId
Description
950110
Backdoor access
950921
Backdoor access
950922
Backdoor access
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