Description
xlock in OpenBSD 6.6 allows local users to gain the privileges of the auth group by providing a LIBGL_DRIVERS_PATH environment variable, because xenocara/lib/mesa/src/loader/loader.c mishandles dlopen.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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retrymp3/Openbsd-Privilege-Escalation ★ 2 · Nov 21, 2020
Script that automates the process of escalating privileges on openbsd system (CVE-2019-19520) by exploiting the xlock binary and againing it's sgid and escalating to the root user by (CVE-2019-19522)…
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://www.openwall.com/lists/oss-security/2019/12/04/5
- https://www.openbsd.org/errata66.html
- [oss-security] 20191204 Re: Authentication vulnerabilities in OpenBSD mailing-list
- [oss-security] 20191204 Authentication vulnerabilities in OpenBSD mailing-list
- 20191205 Authentication vulnerabilities in OpenBSD mailing-list
- http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
- 20191206 Authentication vulnerabilities in OpenBSD mailing-list