Input validation error in OWASP ModSecurity Core Rule Set (CRS) - CVE-2022-39955

Vulnerability identifier: #VU72087

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-39955

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass filtration rules.

The vulnerability exists due to insufficient validation of user-supplied input when parsing HTTP Content-Type header field that indicates multiple character encoding schemes. A remote attacker send a specially crafted HTTP request and bypass the configurable CRS Content-Type header "charset" allow list.

OWASP ModSecurity Core Rule Set (CRS)
Gentoo Linux
openEuler
Fedora
mod_security
mod_security_crs
www-apache/modsecurity-crs

Install updates from vendor's website.

OWASP ModSecurity Core Rule Set (CRS) - addressed in versions 3.2.3, 3.3.4
mod_security - addressed in versions 2.9.6-1.fc35, 2.9.6-1.fc36, 2.9.6-1.fc37
mod_security_crs - update to 3.2.2-1
www-apache/modsecurity-crs - update to 3.3.4
mod_security_crs - addressed in versions 3.3.4-1.fc35, 3.3.4-1.fc36, 3.3.4-1.fc37

• https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/

• Multiple vulnerabilities in OWASP ModSecurity Core Rule Set (CRS)
• Gentoo update for OWASP ModSecurity Core Rule Set
• openEuler update for mod_security_crs
• Fedora 37 update for mod_security, mod_security_crs
• Fedora 36 update for mod_security, mod_security_crs
• Fedora 35 update for mod_security, mod_security_crs