CVE-2019-11391

NameCVE-2019-11391
DescriptionAn issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. /rules/REQUEST-933-APPLICATION-ATTACK-PHP.conf allows remote attackers to cause a denial of service (ReDOS) by entering a specially crafted string with $a# at the beginning and nested repetition operators. NOTE: the software maintainer disputes that this is a vulnerability because the issue cannot be exploited via ModSecurity
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs928053

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
modsecurity-crs (PTS)bullseye3.3.0-1+deb11u1vulnerable
bookworm3.3.4-1vulnerable
sid, trixie3.3.6-1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
modsecurity-crssource(unstable)(unfixed)unimportant928053

Notes

https://github.com/SpiderLabs/owasp-modsecurity-crs/issues/1357
Negligible security impact, doesn't affect the CRS rule set as used
by libapache2-mod-security2, only affects libmodsecurity3 in non-standard settings

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