freedesktop systemd CVE-2018-6954 vulnerability in FreeDesktop and Other Products
Published on February 13, 2018

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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.

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Vulnerability Analysis

CVE-2018-6954 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is an insecure temporary file Vulnerability?

The software 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.

CVE-2018-6954 has been classified to as an insecure temporary file vulnerability or weakness.


Products Associated with CVE-2018-6954

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2018-6954 are published in these products:

FreeDesktop Systemd
 
Canonical Ubuntu Linux
 
Systemdproject Systemd
 
OpenSuse Leap
 

Exploit Probability

EPSS
0.13%
Percentile
31.94%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.