Local denial of service in Buildah

1) UNIX symbolic link following

EUVDB-ID: #VU98817

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-9676

CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a symlink following issue when running a malicious image using an automatically assigned user namespace (`--userns=auto` in Podman and Buildah). A local user can create a symbolic link to an arbitrary file on the system, force the library to read it and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

buildah: 1.37.0 - 1.37.4

CPE2.3

• cpe:2.3:a:containers:buildah:1.37.0:*:*:*:*:*:*:*
• cpe:2.3:a:containers:buildah:1.37.1:*:*:*:*:*:*:*
• cpe:2.3:a:containers:buildah:1.37.2:*:*:*:*:*:*:*

External links

https://github.com/containers/buildah/releases/tag/v1.37.5

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.