CVE-2019-19726 EXPLOIT
7.8
HIGH · CVSS 3.1 · EPSS 3.5% (pctl 89)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 7.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 3.52% — more likely to be exploited than 89% of all CVEs |
| Weakness | CWE-269 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2019-12-12 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| openbsd | openbsd |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | OpenBSD - Dynamic Loader chpass Privilege Escalation (Metasploit) | 2019-12-30 |
| exploit-db | OpenBSD 6.x - Dynamic Loader Privilege Escalation | 2019-12-16 |
References
- 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
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