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CVE-2019-19726 Detail

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.


Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
http://seclists.org/fulldisclosure/2019/Dec/31 Exploit  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/25 Exploit  Mailing List  Third Party Advisory 
https://www.openbsd.org/errata66.html Patch  Vendor Advisory 
https://www.openwall.com/lists/oss-security/2019/12/11/9 Mailing List  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-269 Improper Privilege Management cwe source acceptance level NIST  

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Change History

10 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-19726
NVD Published Date:
12/11/2019
NVD Last Modified:
10/06/2023
Source:
MITRE