Vulnerability identifier: #VU50675
Vulnerability risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-367
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
firejail
Other software /
Other software solutions
Vendor: firejail.wordpress.com
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a TOCTOU race condition between a stat operation and an OverlayFS mount operation in firejail. A local user can escalate privileges on the system.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
firejail: 0.9.30 - 0.9.64.2
External links
http://www.openwall.com/lists/oss-security/2021/02/09/1
http://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b
http://github.com/netblue30/firejail/releases/tag/0.9.64.4
http://lists.debian.org/debian-lts-announce/2021/02/msg00015.html
http://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/
http://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt
http://www.debian.org/security/2021/dsa-4849
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.