CVE-2019-19521 Information

Description

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).

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8