CVE-2017-18078
systemd - security update
7.8
HIGH
CVSS 3.1
EPSS 0.08%
Description
systemd-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.
How to fix CVE-2017-18078
To remediate CVE-2017-18078, upgrade the affected package to a fixed version below.
- —upgrade to 237-1 or later
- —upgrade to 215-17+deb8u12 or later
Is CVE-2017-18078 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 237-1
- from 0, < 215-17+deb8u12
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |