Auth bypass in OpenBSD
CVE-2019-19520
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.013 (70.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.013 · change: -0.000
Affected products
- OpenBSD — versions 6.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2019/12/04/5 (Exploit, Mailing List, Third Party Advisory)
- www.openbsd.org/errata66.html (Vendor Advisory)
- www.openwall.com/lists/oss-security/2019/12/04/6 (mailing-list, Mailing List)
- www.openwall.com/lists/oss-security/2019/12/04/5 (mailing-list, Exploit, Mailing List, Third Party Advisory)
- seclists.org/bugtraq/2019/Dec/8 (mailing-list, Exploit, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentic… (Third Party Advisory)
- seclists.org/fulldisclosure/2019/Dec/14 (mailing-list, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-19520?
- CVE-2019-19520 is a high-severity vulnerability in OpenBSD, classified under Incorrect Authorization. CVSS score: 7.8/10. Published 2019-12-05.
- How severe is CVE-2019-19520?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2019-19520 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.