#VU85991 Security features bypass in runc - CVE-2024-21626

Vulnerability identifier: #VU85991

Vulnerability risk: High

CVSSv4.0: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2024-21626

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
runc
Server applications / Virtualization software

Vendor: Linux Foundation

Description

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

The vulnerability exists due to an internal file descriptor leak that can cause a newly-spawned container process (from runc exec) to have a working directory in the host filesystem namespace or a malicious image to allow a container process to gain access to the host filesystem through runc run. A remote attacker can trick the victim into loading a malicious image to bypass sandbox restrictions and execute arbitrary code on the host OS.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

runc: 1.0.0 rc93 - 1.1.11

---

External links
https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv
https://github.com/opencontainers/runc/commit/02120488a4c0fc487d1ed2867e901eeed7ce8ecf
https://github.com/opencontainers/runc/releases/tag/v1.1.12

---

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. However, a fully functional exploit for this vulnerability is available.