Vulnerability CVE-2019-19726


Published: 2019-12-12

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.

See advisories in our WLB2 database:
Topic
Author
Date
High
OpenBSD 6.x Dynamic Loader Privilege Escalation
Qualys
17.12.2019
High
OpenBSD Dynamic Loader chpass Privilege Escalation
Brendan Coles
29.12.2019
High
glibc ld.so Local Privilege Escalation
Qualys Security ...
08.10.2023

Type:

CWE-269

(Improper Privilege Management)

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Openbsd -> Openbsd 

 References:
http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html
http://seclists.org/fulldisclosure/2019/Dec/31
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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