CVE Vulnerability

CVE-2019-19521

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).

7.5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

9.8 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://www.openbsd.org/errata66.html Vendor Advisory
https://www.openwall.com/lists/oss-security/2019/12/04/5 Exploit Mailing List
http://www.openwall.com/lists/oss-security/2019/12/04/6 Mailing List
http://www.openwall.com/lists/oss-security/2019/12/04/5 Exploit Mailing List
https://seclists.org/bugtraq/2019/Dec/8 Exploit Mailing List
http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html Third Party Advisory
http://seclists.org/fulldisclosure/2019/Dec/14 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:o:openbsd:openbsd:6.6:*:*:*:*:*:*:*
Information

Published : 2019-12-05 12:15

Updated : 2019-12-12 03:55

NVD link : CVE-2019-19521

Mitre link : CVE-2019-19521

Products Affected
No products.
CWE
CWE-287