#VU47112 Incorrect default permissions in Singularity - CVE-2020-25040

Vulnerability identifier: #VU47112

Vulnerability risk: Low

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

CVE-ID: CVE-2020-25040

CWE-ID: CWE-276

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Singularity
Universal components / Libraries / Libraries used by multiple products

Vendor: Singularity

Description

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

The vulnerability exists due to incorrect default permissions for temporary directories used in explicit and implicit container build operations. A local user with access to the system can view contents of files and directories or modify them.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Singularity: 3.0.0 - 3.6.2

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External links
https://lists.opensuse.org/opensuse-security-announce/2020-09/msg00070.html
https://github.com/hpcng/singularity/security/advisories/GHSA-jv9c-w74q-6762
https://medium.com/sylabs

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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.