CVE-2022-39956

NameCVE-2022-39956
DescriptionThe OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass for HTTP multipart requests by submitting a payload that uses a character encoding scheme via the Content-Type or the deprecated Content-Transfer-Encoding multipart MIME header fields that will not be decoded and inspected by the web application firewall engine and the rule set. The multipart payload will therefore bypass detection. A vulnerable backend that supports these encoding schemes can potentially be exploited. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised upgrade to 3.2.2 and 3.3.3 respectively. The mitigation against these vulnerabilities depends on the installation of the latest ModSecurity version (v2.9.6 / v3.0.8).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs1021137

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
modsecurity-crs (PTS)buster3.1.0-1+deb10u2vulnerable
bullseye3.3.0-1+deb11u1vulnerable
bookworm, sid3.3.2-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
modsecurity-crssource(unstable)(unfixed)1021137

Notes

[bullseye] - modsecurity-crs <no-dsa> (Minor issues; will be fixed in point release)
https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/
Depends on changes to be done in src:libmodsecurity3 / src:modsecurity-apache, cf.
https://bugs.debian.org/1020303

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