Vulnerability identifier: #VU54999

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32760

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
containerd
Other software / Other software solutions

Vendor: containerd

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to archive package allows chmod of file outside of unpack target directory. A remote attacker can deny access to the expected owner of the file, widen access to others, or set extended bits like setuid, setgid, and sticky.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

containerd: 1.4.0 - 1.4.7, 1.5.0 - 1.5.3

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External links
http://github.com/containerd/containerd/security/advisories/GHSA-c72p-9xmj-rx3w
http://github.com/containerd/containerd/releases/tag/v1.4.8
http://github.com/containerd/containerd/releases/tag/v1.5.4

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.