Home/CVE/Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race conditio
CVE

CVE-2021-26910

Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race conditio

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.

HIGH · CVSS 7.8 EPSS 0.0005
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
▤

Affected Products & Versions

2
firejail project firejail< 0.9.64.4
debian linuxall versions
⚠

Public Exploits & PoCs

2
pocunparalleled.eu · 20210208-rigged-race-against-firejail-for-local-rootunparalleled.eu
pocunparalleled.eu · advisory-unpar-2021-0.txtunparalleled.eu
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Feb 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

2
usnUSN-5141-1
suse-csafopenSUSE-SU-2021:0271-1
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2021/02/09/1ExploitMailing ListPatchThird Party Advisory
https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834bPatchThird Party Advisory
https://github.com/netblue30/firejail/releases/tag/0.9.64.4Release NotesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00015.htmlThird Party Advisory
https://security.gentoo.org/glsa/202105-19Third Party Advisory
https://www.debian.org/security/2021/dsa-4849Third Party Advisory
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