CVE-2019-19726
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.52% probability · 89th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-269
- Affected
- openbsd/openbsd
- Source
- cve@mitre.org
References
- http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
- http://seclists.org/fulldisclosure/2019/Dec/31Exploit, Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2023/Oct/11
- http://www.openwall.com/lists/oss-security/2023/10/03/2
- https://seclists.org/bugtraq/2019/Dec/25Exploit, Mailing List, Third Party Advisory
- https://www.openbsd.org/errata66.htmlPatch, Vendor Advisory
- https://www.openwall.com/lists/oss-security/2019/12/11/9Mailing List, Third Party Advisory
- http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
- http://seclists.org/fulldisclosure/2019/Dec/31Exploit, Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2023/Oct/11
- http://www.openwall.com/lists/oss-security/2023/10/03/2
- https://seclists.org/bugtraq/2019/Dec/25Exploit, Mailing List, Third Party Advisory
- https://www.openbsd.org/errata66.htmlPatch, Vendor Advisory
- https://www.openwall.com/lists/oss-security/2019/12/11/9Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.