SB2012021006 - Fedora EPEL 6 update for libyubikey, pam_yubico, ykclient
Published: February 10, 2012
Security Bulletin ID
SB2012021006
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2011-4120)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration. A remote attacker could use this flaw to circumvent common authentication process and obtain access to the account in question by providing a NULL value (pressing Ctrl-D keyboard sequence) as the password string.
Remediation
Install update from vendor's website.