Vulnerability 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 Score
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Firejail Project | Firejail | < 0.9.64.4 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2021/02/09/1ExploitMailing ListPatch
- https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d841827PatchThird 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://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-locaExploitThird Party Advisory
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txtExploitThird Party Advisory
- https://www.debian.org/security/2021/dsa-4849Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/02/09/1ExploitMailing ListPatch
- https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d841827PatchThird 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://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-locaExploitThird Party Advisory
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txtExploitThird Party Advisory
FAQ
What is CVE-2021-26910?
CVE-2021-26910 is a vulnerability with a CVSS score of 7.8 (HIGH). 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.
How severe is CVE-2021-26910?
CVE-2021-26910 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-26910?
Check the references section above for vendor advisories and patch information. Affected products include: Firejail Project Firejail, Debian Debian Linux.