Auth bypass in OpenBSD
CVE-2019-19519
In OpenBSD 6.6, local users can use the su -L option to achieve any login class (often excluding root) because there is a logic error in the main function in su/su.c.
Vulnerability class: Broken Authentication
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: 0.004 (31.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- OpenBSD — versions 6.6
Weakness classification (CWE)
References
- www.openwall.com/lists/oss-security/2019/12/04/5 (Exploit, Mailing List, Third Party Advisory)
- www.openbsd.org/errata66.html (Vendor Advisory)
- github.com/openbsd/src/blob/2dfc98f42e117c7605b52b5020b630d98601dc22/usr.bin/su… (Third Party Advisory)
- 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-2019-19519?
- CVE-2019-19519 is a high-severity vulnerability in OpenBSD, classified under Improper Authentication. CVSS score: 7.8/10. Published 2019-12-05.
- How severe is CVE-2019-19519?
- High severity. CVSS v3 base score is 7.8 out of 10.