CVE-2021-26910
HIGHCVSS 7/10EPSS 0.44%
Last modified
CVE-2021-26910 is a high-severity vulnerability rated 7/10 on the CVSS scale. 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.. EPSS estimates a 0.44% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Firejail Project | Firejail | < 0.9.64.4 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
References
- http://www.openwall.com/lists/oss-security/2021/02/09/1Exploit, Mailing List, Patch, Third Party Advisory
- https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834bPatch, Third Party Advisory
- https://github.com/netblue30/firejail/releases/tag/0.9.64.4Release Notes, Third 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-local-root/Exploit, Third Party Advisory
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txtExploit, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4849Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/02/09/1Exploit, Mailing List, Patch, Third Party Advisory
- https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834bPatch, Third Party Advisory
- https://github.com/netblue30/firejail/releases/tag/0.9.64.4Release Notes, Third 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-local-root/Exploit, Third Party Advisory
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txtExploit, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4849Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-26910?
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 a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.
How do I fix CVE-2021-26910?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2021-26910?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST