1. Ubuntu Security Notices
  2. USN-5141-1

USN-5141-1: Firejail vulnerability

Publication date

11 November 2021

Overview

Firejail could be made to overwrite files as the administrator.

Releases

Packages

Details

Roman Fiedler discovered that a race condition existed in Firejail
when using OverlayFS to prevent writes to the underlying file system. A
local attacker could use this to gain administrative privileges. Note:
this update disables support for OverlayFS in Firejail.

Roman Fiedler discovered that a race condition existed in Firejail
when using OverlayFS to prevent writes to the underlying file system. A
local attacker could use this to gain administrative privileges. Note:
this update disables support for OverlayFS in Firejail.

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
20.04 focal firejail –  0.9.62-3ubuntu0.1

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References

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