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CVE-2018-6954

nvd nist
Published: Feb 13, 2018Modified: Jun 9, 2025

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7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: NVD

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.

Affected (5)

Systemd Project
1 product
Systemd
Canonical
1 product
Ubuntu Linux
Opensuse
1 product
Leap
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Systemd
Up to 237
Configuration B
4 vulnerable
Vulnerable SoftwareAffected Versions
Canonical
Ubuntu Linux
Version 16.04
Ubuntu Linux
Version 18.04
Ubuntu Linux
Version 18.10
Leap
Version 42.3

Related CWEs

CWE-59
Improper Link Resolution Before File Access ('Link Following')
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

References (12)

Source: cve@mitre.org
Third Party Advisory
Source: cve@mitre.org
ExploitIssue TrackingPatchThird Party Advisory
Source: cve@mitre.org
Source: cve@mitre.org
Source: cve@mitre.org
Third Party Advisory
Source: cve@mitre.org
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
ExploitIssue TrackingPatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Source: af854a3a-2127-422b-91ae-364da2661108
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

Timeline

No history available yet.