CVE-2017-18078

NameCVE-2017-18078
Descriptionsystemd-tmpfiles in systemd before 237 attempts to support ownership/permission changes on hardlinked files even if the fs.protected_hardlinks sysctl is turned off, which allows local users to bypass intended access restrictions via vectors involving a hard link to a file for which the user lacks write access, as demonstrated by changing the ownership of the /etc/passwd file.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1762-1, ELA-115-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
systemd (PTS)jessie, jessie (lts)215-17+deb8u15fixed
stretch (security)232-25+deb9u14vulnerable
stretch (lts), stretch232-25+deb9u17vulnerable
buster, buster (lts)241-7~deb10u11fixed
buster (security)241-7~deb10u10fixed
bullseye247.3-7+deb11u5fixed
bullseye (security)247.3-7+deb11u6fixed
bookworm252.31-1~deb12u1fixed
trixie257-2fixed
sid257.1-4fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
systemdsourcewheezy44-11+deb7u7ELA-115-1
systemdsourcejessie215-17+deb8u12DLA-1762-1
systemdsource(unstable)237-1unimportant

Notes

https://github.com/systemd/systemd/issues/7736
https://github.com/systemd/systemd/commit/5579f85663d10269e7ac7464be6548c99cea4ada (v237)
Neutralised by kernel hardening

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