Vulnerability · Published Feb 8, 2021 · Assigned by mitre
CVE-2021-26910
High 7.8
In plain English
A high-severity security flaw in the firejail package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.4%top 60.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | firejail | 0.9.64.4-1 | DEBIAN-CVE-2021-26910 |
| Debian:13 | firejail | 0.9.64.4-1 | DEBIAN-CVE-2021-26910 |
| Debian:14 | firejail | 0.9.64.4-1 | DEBIAN-CVE-2021-26910 |
Affected products (as reported)
References
- https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b x_refsource_MISC
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt x_refsource_MISC
- https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/ x_refsource_MISC
- https://github.com/netblue30/firejail/releases/tag/0.9.64.4 x_refsource_MISC
- [oss-security] 20210209 Re: [cve-pending] Firejail: root privilege escalation in OverlayFS code mailing-list, x_refsource_MLIST
- DSA-4849 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20210211 [SECURITY] [DLA 2554-1] firejail security update mailing-list, x_refsource_MLIST
- GLSA-202105-19 vendor-advisory, x_refsource_GENTOO