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CVE-2019-19726

Date: December 11, 2019

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.

Language: C

Severity Score

Related Resources (11)

http://seclists.org/fulldisclosure/2023/Oct/11
https://nvd.nist.gov/vuln/detail/CVE-2019-19726
https://seclists.org/bugtraq/2019/Dec/25
https://www.openwall.com/lists/oss-security/2019/12/11/9
http://seclists.org/fulldisclosure/2019/Dec/31
http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html
http://www.openwall.com/lists/oss-security/2023/10/03/2
http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html
https://www.openbsd.org/errata66.html
https://www.mend.io/vulnerability-database/CVE-2019-19726

Severity Score

Weakness Type (CWE)

Improper Privilege Management

CWE-269

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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