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CVE-2019-19726 Details

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

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html	CVE	ExploitThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html	CVE	Third Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html	CVE
http://seclists.org/fulldisclosure/2019/Dec/31	CVE	ExploitMailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2023/Oct/11	CVE
https://seclists.org/bugtraq/2019/Dec/25	CVE	ExploitMailing ListThird Party Advisory
https://www.openbsd.org/errata66.html	CVE	PatchVendor Advisory
https://www.openwall.com/lists/oss-security/2019/12/11/9	CVE	Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/10/03/2	CVE
http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html	[email protected]	ExploitThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html	[email protected]	Third Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html	[email protected]
http://seclists.org/fulldisclosure/2019/Dec/31	[email protected]	ExploitMailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2023/Oct/11	[email protected]
https://seclists.org/bugtraq/2019/Dec/25	[email protected]	ExploitMailing ListThird Party Advisory
https://www.openbsd.org/errata66.html	[email protected]	PatchVendor Advisory
https://www.openwall.com/lists/oss-security/2019/12/11/9	[email protected]	Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/10/03/2	[email protected]

see all 18 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-269	Improper Privilege Management	[email protected]

Affected Products

Product	Versions
openbsd openbsd	<= 6.6
CPE cpe:2.3:o:openbsd:openbsd:::::::: Remediation No remediation found in references.

Change History

12 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Oct 6, 2023	CVE Modified	[email protected]
Oct 6, 2023	CVE Modified	[email protected]
Oct 3, 2023	CVE Modified	[email protected]
Jan 30, 2023	Modified Analysis	[email protected]
Dec 27, 2019	CVE Modified	[email protected]
Dec 16, 2019	Initial Analysis	[email protected]
Dec 13, 2019	CVE Modified	[email protected]
Dec 12, 2019	CVE Modified	[email protected]
Dec 12, 2019	CVE Modified	[email protected]