CVE-2019-6133

NameCVE-2019-6133
DescriptionIn PolicyKit (aka polkit) 0.115, the "start time" protection mechanism can be bypassed because fork() is not atomic, and therefore authorization decisions are improperly cached. This is related to lack of uid checking in polkitbackend/polkitbackendinteractiveauthority.c.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1644-1, DLA-1799-1
NVD severitymedium
Debian Bugs918985

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1vulnerable
jessie (security)3.16.81-1fixed
stretch4.9.210-1fixed
stretch (security)4.9.189-3+deb9u2fixed
buster4.19.98-1fixed
buster (security)4.19.67-2+deb10u2fixed
bullseye5.4.19-1fixed
sid5.5.13-2fixed
policykit-1 (PTS)jessie0.105-15~deb8u2vulnerable
jessie (security)0.105-15~deb8u4fixed
stretch, stretch (security)0.105-18+deb9u1vulnerable
buster0.105-25fixed
bullseye, sid0.105-26fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.19.16-1
linuxsourcejessie3.16.68-1DLA-1799-1
linuxsourcestretch4.9.161-1
policykit-1source(unstable)0.105-25918985
policykit-1sourcejessie0.105-15~deb8u4DLA-1644-1

Notes

[stretch] - policykit-1 <no-dsa> (Minor issue, kernel mitigation will land in next 4.9.x rebase)
https://bugs.chromium.org/p/project-zero/issues/detail?id=1692
https://gitlab.freedesktop.org/polkit/polkit/merge_requests/19
https://gitlab.freedesktop.org/polkit/polkit/commit/c898fdf4b1aafaa04f8ada9d73d77c8bb76e2f81
Issue can be mitigated in kernel with
https://git.kernel.org/linus/7b55851367136b1efd84d98fea81ba57a98304cf (landed in 4.9.150)

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