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CVE-2021-26910

Published: 8 February 2021

Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race condition between a stat operation and an OverlayFS mount operation.

From the Ubuntu Security Team

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.

Priority

Medium

Cvss 3 Severity Score

7.0

Score breakdown

Status

Package Release Status
firejail
Launchpad, Ubuntu, Debian
bionic Needs triage

focal
Released (0.9.62-3ubuntu0.1)
groovy Ignored
(end of life)
hirsute Not vulnerable
(0.9.64.4-1)
impish Not vulnerable
(0.9.64.4-1)
jammy Not vulnerable
(0.9.64.4-1)
kinetic Not vulnerable
(0.9.64.4-1)
lunar Not vulnerable
(0.9.64.4-1)
mantic Not vulnerable
(0.9.64.4-1)
noble Not vulnerable
(0.9.64.4-1)
trusty Does not exist

upstream
Released (0.9.64.4-1)
xenial Needs triage

Severity score breakdown

Parameter Value
Base score 7.0
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H