CVE-2018-6954

Priority
Description
systemd-tmpfiles in systemd through 237 mishandles symlinks present in
non-terminal path components, which allows local users to obtain ownership
of arbitrary files via vectors involving creation of a directory and a file
under that directory, and later replacing that directory with a symlink.
This occurs even if the fs.protected_symlinks sysctl is turned on.
Assigned-to
chrisccoulson
Notes
mdeslauroriginal fix was incomplete, see second pull
chrisccoulsonFix reverted in xenial because it breaks containers running
on pre-2.6.39 kernels
mdeslaurfix was re-introduced in xenial in 229-4ubuntu21.15
Package
Upstream:needs-triage
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):not-affected (binary not built)
Ubuntu 16.04 LTS (Xenial Xerus):released (229-4ubuntu21.15)
Ubuntu 18.04 LTS (Bionic Beaver):released (237-3ubuntu10.9)
Patches:
Upstream:https://github.com/systemd/systemd/pull/8358
Upstream:https://github.com/systemd/systemd/pull/8822
Upstream:https://github.com/systemd/systemd/commit/936f6bdb803c432578e2cdcc5f93f3bfff93aff0
More Information

Updated: 2020-03-18 22:53:27 UTC (commit 2ea7df7bd1e69e1e489978d2724a936eb3faa1b8)