CVE-2019-19726

moderate-risk

Published 2019-12-12

OpenBSD through 6.6 allows local users to escalate to root because a check for LD_LIBRARY_PATH in setuid programs can be defeated by setting a very small RLIMIT_DATA resource limit. When executing chpass or passwd (which are setuid root), _dl_setup_env in ld.so tries to strip LD_LIBRARY_PATH from the environment, but fails when it cannot allocate memory. Thus, the attacker is able to execute their own library code as root.

Do I need to act?

9.4% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

2 public exploits available

47803, 47780

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.8/10 High

LOCAL / LOW complexity

Affected Products (1)

Openbsd

Affected Vendors

Openbsd

References (18)

Exploit http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dyn...

Third Party Advisory http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privil...

http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalati...

Exploit http://seclists.org/fulldisclosure/2019/Dec/31

http://seclists.org/fulldisclosure/2023/Oct/11

http://www.openwall.com/lists/oss-security/2023/10/03/2

Exploit https://seclists.org/bugtraq/2019/Dec/25

Patch https://www.openbsd.org/errata66.html

Mailing List https://www.openwall.com/lists/oss-security/2019/12/11/9