CVE-2021-26910 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt https://github.com/netblue30/firejail/releases/tag/0.9.64.4 https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/ http://www.openwall.com/lists/oss-security/2021/02/09/1 https://www.debian.org/security/2021/dsa-4849 https://lists.debian.org/debian-lts-announce/2021/02/msg00015.html https://security.gentoo.org/glsa/202105-19

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.0