CVE-2019-19521
First published: Wed Dec 04 2019(Updated: )
libc in OpenBSD 6.6 allows authentication bypass via the -schallenge username, as demonstrated by smtpd, ldapd, or radiusd. This is related to gen/auth_subr.c and gen/authenticate.c in libc (and login/login.c and xenocara/app/xenodm/greeter/verify.c).
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Openbsd Openbsd | =6.6 |
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Reference Links
- http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
- http://seclists.org/fulldisclosure/2019/Dec/14
- http://www.openwall.com/lists/oss-security/2019/12/04/5
- http://www.openwall.com/lists/oss-security/2019/12/04/6
- https://seclists.org/bugtraq/2019/Dec/8
- https://www.openbsd.org/errata66.html
- https://www.openwall.com/lists/oss-security/2019/12/04/5
Frequently Asked Questions
What is CVE-2019-19521?
CVE-2019-19521 is a vulnerability in the libc library in OpenBSD 6.6 that allows authentication bypass via the -schallenge username.
How severe is CVE-2019-19521?
CVE-2019-19521 has a severity rating of 9.8, which is considered critical.
Which software version is affected by CVE-2019-19521?
OpenBSD 6.6 is the affected version of the software.
How can the authentication bypass be exploited?
The authentication bypass can be exploited by using the -schallenge username in services like smtpd, ldapd, or radiusd.
Are there any references for CVE-2019-19521?
References for CVE-2019-19521 can be found at the following links: http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html, http://seclists.org/fulldisclosure/2019/Dec/14, http://www.openwall.com/lists/oss-security/2019/12/04/5
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