CVE-2019-19726

Vulnerability 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 Score

Affected Products

Related Weaknesses (CWE)

References

• http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-DynExploitThird Party AdvisoryVDB Entry
• http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-PrivilThird Party AdvisoryVDB Entry
• http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalati
• http://seclists.org/fulldisclosure/2019/Dec/31ExploitMailing ListThird 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/25ExploitMailing ListThird Party Advisory
• https://www.openbsd.org/errata66.htmlPatchVendor Advisory
• https://www.openwall.com/lists/oss-security/2019/12/11/9Mailing ListThird Party Advisory
• http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-DynExploitThird Party AdvisoryVDB Entry
• http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-PrivilThird Party AdvisoryVDB Entry
• http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalati
• http://seclists.org/fulldisclosure/2019/Dec/31ExploitMailing ListThird Party Advisory
• http://seclists.org/fulldisclosure/2023/Oct/11
• http://www.openwall.com/lists/oss-security/2023/10/03/2