Vulnerability identifier: #VU23426

Vulnerability risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:P/RL:U/RC:C]

CVE-ID: CVE-2019-19519

CWE-ID: CWE-399

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
OpenBSD
Operating systems & Components / Operating system

Vendor: OpenBSD

Description

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

The vulnerability exists due to a logic error in the main function in su/su.c. A local user can use the su -L option to achieve any login class.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

OpenBSD: 6.6

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External links
http://www.openwall.com/lists/oss-security/2019/12/04/5
http://github.com/openbsd/src/blob/2dfc98f42e117c7605b52b5020b630d98601dc22/usr.bin/su/su.c#L210-L211
http://seclists.org/bugtraq/2019/Dec/8
http://www.openbsd.org/errata66.html
http://www.openwall.com/lists/oss-security/2019/12/04/5

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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. However, proof of concept for this vulnerability is available.