#VU57176 Security restrictins bypass in Flatpak - CVE-2021-41133

Vulnerability identifier: #VU57176

Vulnerability risk: Low

CVSSv4.0: 5.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-41133

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Flatpak
Server applications / Frameworks for developing and running applications

Vendor: Flatpak

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an error in the VFS-manipulating syscalls implementation. A local user can bypass sandbox restrictions and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Flatpak: 1.8.0 - 1.8.5, 1.9.1 - 1.9.3, 1.10.0 - 1.12.0

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External links
https://github.com/flatpak/flatpak/releases/tag/1.12.1
https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q
https://github.com/flatpak/flatpak/releases/tag/1.10.5

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Q & A

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.