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Link Following Affecting systemd package, versions <237-1

Severity

 Recommended
low

Based on Debian security rating

    Threat Intelligence

    EPSS
    0.06% (27th percentile)

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  • Snyk ID SNYK-DEBIAN12-SYSTEMD-1560726
  • published 29 Jan 2018
  • disclosed 29 Jan 2018
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Introduced: 29 Jan 2018

CVE-2017-18078 Open this link in a new tab
CWE-59 Open this link 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.

References

CVSS Scores

version 3.1
Expand this section

NVD

7.8 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High