Link Following Affecting apport package, versions <2.14.1-0ubuntu3.29+esm4


Severity

Recommended
high

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.08% (38th percentile)

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  • Snyk IDSNYK-UBUNTU1404-APPORT-572327
  • published2 Apr 2020
  • disclosed22 Apr 2020

Introduced: 2 Apr 2020

CVE-2020-8831  (opens in a new tab)
CWE-59  (opens in a new tab)

How to fix?

Upgrade Ubuntu:14.04 apport to version 2.14.1-0ubuntu3.29+esm4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream apport package and not the apport package as distributed by Ubuntu. See How to fix? for Ubuntu:14.04 relevant fixed versions and status.

Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.

CVSS Scores

version 3.1