CVE-2021-26910: Race Condition
First published: Mon Feb 08 2021(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/firejail | 0.9.58.2-2+deb10u3 0.9.64.4-2+deb11u1 0.9.72-2 | |
| Firejail Project Firejail | <0.9.64.4 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 |
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Reference Links
- https://www.openwall.com/lists/oss-security/2021/02/08/5
- https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt
- https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/
- https://security-tracker.debian.org/tracker/CVE-2021-26910
- http://www.openwall.com/lists/oss-security/2021/02/09/1
- https://github.com/netblue30/firejail/releases/tag/0.9.64.4
- https://lists.debian.org/debian-lts-announce/2021/02/msg00015.html
- https://security.gentoo.org/glsa/202105-19
- https://www.debian.org/security/2021/dsa-4849
Frequently Asked Questions
What is CVE-2021-26910?
CVE-2021-26910 is a vulnerability in Firejail before 0.9.64.4 that allows attackers to bypass intended access restrictions due to a race condition.
What is the severity of CVE-2021-26910?
CVE-2021-26910 has a severity value of 7, which is considered high.
How does CVE-2021-26910 affect Firejail?
CVE-2021-26910 affects Firejail versions before 0.9.64.4.
How can the CVE-2021-26910 vulnerability be fixed?
To fix the CVE-2021-26910 vulnerability, update Firejail to version 0.9.64.4 or later.
Are there any references for CVE-2021-26910?
Yes, you can find references for CVE-2021-26910 at the following links: [Reference 1](https://www.openwall.com/lists/oss-security/2021/02/08/5), [Reference 2](https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b), [Reference 3](https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt).
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