Authentication Bypass in Yubico PAM Module
CVE-2011-4120

9.8CRITICAL

Key Information:

Vendor

yubico-pam

Status
yubico-pam
Vendor
CVE Published:
26 November 2019

What is CVE-2011-4120?

The Yubico PAM Module, prior to version 2.10, contains a significant vulnerability that allows a remote attacker to bypass standard user authentication. This occurs when the configuration option 'use_first_pass' is not enabled, allowing the module to be set as 'sufficient' in the PAM configuration. In this scenario, an attacker can gain unauthorized access by submitting a NULL value, such as a Ctrl-D keyboard sequence, as the password, effectively circumventing the authentication process.

Affected Version(s)

yubico-pam before 2.10

References

https://security-tracker.debian.org/tracker/CVE-2011-4120
x_refsource_MISC
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120
x_refsource_MISC
https://access.redhat.com/security/cve/cve-2011-4120
x_refsource_MISC

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

.