Authentication Bypass in OpenBSD 6.6 Affecting Libc
CVE-2019-19521

9.8CRITICAL

Key Information:

Vendor

OpenBSD
Status
OpenBSD
Vendor
CVE Published:
5 December 2019

What is CVE-2019-19521?

The vulnerability identified in OpenBSD 6.6 involves an authentication bypass in the libc library, which could allow unauthorized access through the -schallenge username in services like smtpd, ldapd, or radiusd. The issue is largely related to the files gen/auth_subr.c and gen/authenticate.c, as well as components of the login system. This flaw raises significant concerns regarding the integrity of user authentication and highlights the need for immediate remediation to protect against unauthorized system access.

References

https://www.openwall.com/lists/oss-security/2019/12/04/5
x_refsource_MISC
https://www.openbsd.org/errata66.html
x_refsource_MISC
http://www.openwall.com/lists/oss-security/2019/12/04/6
mailing-listx_refsource_MLIST

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2019-19521 : Authentication Bypass in OpenBSD 6.6 Affecting Libc