OWASP ModSec CRS Paranoia Mode Sibling 981173

This page contains a proposal for a stricter rule-clone for ModSecurity CRS Paranoia Mode.

981173 : SQL Injection Character Anomaly Usage

Original ID (2.2.x)	Change	Whitelisting
981173	Regex counter decreased from 4 to 1. Anomaly scoring increased to critical.	Regex for UUIDs in chained Rule.

 #
 # -=[ SQL Injection Character Anomaly Usage ]=-
 #
 # This is a paranoid sibling to 2.2.9 Rule 981173.
 # The regex limit is set to '1' and the anomaly scoring is increased to 'critical'.
 # For dealing with false positives, UUID format is whitelisted with a chained rule.
 #
 SecRule ARGS_NAMES|ARGS|XML:/* "([\~\!\@\#\$\%\^\&\*\(\)\-\+\=\{\}\[\]\|\:\;\"\'\´\’\‘\`\<\>].*?){1,}"\
       "chain,\
       phase:request,\
       rev:'2',\
       ver:'OWASP_CRS/3.0.0',\
       maturity:'X',\
       accuracy:'Y',\
       t:none,t:urlDecodeUni,\
       block,\
       msg:'Restricted SQL Character Anomaly Detection Alert - Total # of special characters exceeded',\
       id:'XXXXXX',\
       tag:'OWASP_CRS/WEB_ATTACK/SQL_INJECTION',\
       tag:'Paranoia rule on level 40',\
       logdata:'Matched Data: %{TX.1} found within %{MATCHED_VAR_NAME}: %{MATCHED_VAR}',\
       severity:'CRITICAL',\
       setvar:'tx.msg=%{rule.msg}',\
       setvar:tx.%{rule.id}-OWASP_CRS/WEB_ATTACK/RESTRICTED_SQLI_CHARS-%{matched_var_name}=%{tx.0}"
       SecRule MATCHED_VARS "!@rx ^[a-f0-9-]{36}$"\
               "t:lowercase,\
               setvar:tx.anomaly_score=+%{tx.critical_anomaly_score},\
               setvar:tx.sql_injection_score=+1"