high7.8Public exploit code
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 RLIMI…
Public exploit code
Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.
- OpenBSD - Dynamic Loader chpass Privilege Escalation (Metasploit)2019-12-30 · local · openbsd · Verified
- OpenBSD 6.x - Dynamic Loader Privilege Escalation2019-12-16 · local · openbsd · Verified
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openbsd | Openbsd | through 6.6 |
Weakness classification
References
- NVD record
- CVE.org record
- http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html
- http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html
- http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
- 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
- https://seclists.org/bugtraq/2019/Dec/25
- https://www.openbsd.org/errata66.html
- https://www.openwall.com/lists/oss-security/2019/12/11/9
- http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html
- http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html
- http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
- 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
- https://seclists.org/bugtraq/2019/Dec/25
- https://www.openbsd.org/errata66.html
- https://www.openwall.com/lists/oss-security/2019/12/11/9