Provide references for CVE-2013-6421.
Where can I find more information about CVE-2013-6421?
References are available at: http://archives.neohapsis.com/archives/bugtraq/2013-12/0077.html, http://www.openwall.com/lists/oss-security/2013/12/03/1, http://www.openwall.com/lists/oss-security/2013/12/03/6, http://vapid.dhs.org/advisories/sprout-0.7.246-command-inj.html.