CVE-2019-19726
CVE-2019-19726
Vexday Risk Score
38Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
Exploit maturity
Functional exploit
Automatable exploit available (Nuclei/Metasploit).
CVSS —EPSS 3.5%KEV nãoPoC públicaNuclei —Metasploit simPatch —
Lifecycle
11 Dec 2019Metasploit module available
12 Dec 2019Published on NVD
16 Dec 2019Public PoC
Weaponization speed
4 daysto first PoC
Weaponized quickly — attackers prioritized this vulnerability. Patch urgently.
Recommendation: Plan a near-term fix — a public PoC already exists.
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.
Affected products
n/a · n/apublic PoCs found — 5
cve_referencepacketstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.htmlunverifiedcve_referencepacketstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.htmlunverifiedcve_referencepacketstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.htmlunverifiedexploitdbwww.exploit-db.com/exploits/47803unverifiedexploitdbwww.exploit-db.com/exploits/47780unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.htmlhttp://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.htmlhttp://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.htmlhttp://seclists.org/fulldisclosure/2019/Dec/31http://seclists.org/fulldisclosure/2023/Oct/11https://seclists.org/bugtraq/2019/Dec/25https://www.openbsd.org/errata66.htmlhttps://www.openwall.com/lists/oss-security/2019/12/11/9http://www.openwall.com/lists/oss-security/2023/10/03/2