Provide references for CVE-2011-4931.
Where can I find more information about CVE-2011-4931?
References are available at: https://security-tracker.debian.org/tracker/CVE-2011-4931, https://access.redhat.com/security/cve/cve-2011-4931, http://www.openwall.com/lists/oss-security/2012/01/17/13.