Vulnerability identifier: #VU23424

Vulnerability risk: Low

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-2019-19520

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 within the xlock in OpenBSD 6.6, due to xenocara/lib/mesa/src/loader/loader.c mishandles dlopen. A local user can provide a specially crafted LIBGL_DRIVERS_PATH environment variable and gain privileges of the auth group.

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://www.openwall.com/lists/oss-security/2019/12/04/6
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.