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).

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

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

7.5^/10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

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 Third Party Advisory
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 Third Party Advisory
https://seclists.org/bugtraq/2019/Dec/8	Exploit Mailing List Third Party Advisory
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 (hide)

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

Information

Published : 2019-12-04 16:15

Updated : 2019-12-12 07:55

NVD link : CVE-2019-19521

Mitre link : CVE-2019-19521

JSON object : View

CWE

CWE-287

Improper Authentication

Products Affected

openbsd

openbsd

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