CVE-2018-6954
Published: 13 February 2018
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.
Priority
Medium
CVSS 3 base score: 7.8
Status
| Package | Release | Status |
|---|---|---|
|
systemd Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Released
(237-3ubuntu10.9)
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Released
(229-4ubuntu21.15)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Not vulnerable
(binary not built)
|
|
|
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 |
||
Notes
| Author | Note |
|---|---|
| mdeslaur | original fix was incomplete, see second pull |
| chrisccoulson | Fix reverted in xenial because it breaks containers running on pre-2.6.39 kernels |
| mdeslaur | fix was re-introduced in xenial in 229-4ubuntu21.15 |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6954
- https://ubuntu.com/security/notices/USN-3816-1
- https://ubuntu.com/security/notices/USN-3816-2
- NVD
- Launchpad
- Debian