Out-of-bounds Write Affecting policykit-1 package, versions <0.105-20ubuntu0.18.04.6


Severity

Recommended
0.0
high
0
10

Based on Ubuntu security rating.

Threat Intelligence

Exploit Maturity
Mature
EPSS
0.14% (50th percentile)

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  • Snyk IDSNYK-UBUNTU1804-POLICYKIT1-2361673
  • published26 Jan 2022
  • disclosed28 Jan 2022

Introduced: 26 Jan 2022

CVE-2021-4034  (opens in a new tab)
CWE-787  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 policykit-1 to version 0.105-20ubuntu0.18.04.6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream policykit-1 package and not the policykit-1 package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.

References

CVSS Scores

version 3.1