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Ubuntu Security Notice USN-5141-1

Ubuntu Security Notice USN-5141-1
Posted Nov 11, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5141-1 - 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.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2021-26910
SHA-256 | de9ac90127621c56848f354ec0b711d244e2e154a3857da22e4ef5b089d14623

Ubuntu Security Notice USN-5141-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5141-1
November 11, 2021

firejail vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

Firejail could be made to overwrite files as the administrator.

Software Description:
- firejail: Application sandbox

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.

Update instructions:

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

Ubuntu 20.04 LTS:
firejail 0.9.62-3ubuntu0.1

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

References:
https://ubuntu.com/security/notices/USN-5141-1
CVE-2021-26910

Package Information:
https://launchpad.net/ubuntu/+source/firejail/0.9.62-3ubuntu0.1

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