#VU47113 Incorrect default permissions in Singularity - CVE-2020-25039

Vulnerability identifier: #VU47113

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-2020-25039

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 on temporary directories used in fakeroot or user namespace container execution. 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: 3.2.0 - 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-w6v2-qchm-grj7
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.