Incorrect Regular Expression in OWASP ModSecurity Core Rule Set (CRS) - CVE-2019-11387
Published: February 9, 2023
Vulnerability identifier: #VU72100
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-11387
CWE-ID: CWE-185
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incorrect ruleset in /rules/REQUEST-942-APPLICATION-ATTACK-SQLI.conf. A remote attacker can pass a specially crafted string with nested repetition operators and perform regular expression denial of service (ReDos) attack.
Affected software
OWASP ModSecurity Core Rule Set (CRS)
How to mitigate CVE-2019-11387
Install update from vendor's website.
OWASP ModSecurity Core Rule Set (CRS) - update to 3.1.1