Vulnerability CVE-2021-26910
Published: 2021-02-08

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.

Type:

CWE-367

 (Time-of-check Time-of-use (TOCTOU) Race Condition)

CVSS2 => (AV:L/AC:M/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.9/10
10/10
3.4/10
Exploit range
Attack complexity
Authentication
Local
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Firejail project -> Firejail 
Debian -> Debian linux 

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