Link Following Affecting systemd package, versions <237-1


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.06% (29th percentile)

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  • Snyk IDSNYK-DEBIAN12-SYSTEMD-1560726
  • published29 Jan 2018
  • disclosed29 Jan 2018

Introduced: 29 Jan 2018

CVE-2017-18078  (opens in a new tab)
CWE-59  (opens in a new tab)

How to fix?

Upgrade Debian:12 systemd to version 237-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream systemd package and not the systemd package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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.

CVSS Scores

version 3.1