Provide references for CVE-2013-4459.
Where can I find more information about CVE-2013-4459?
References are available at: http://www.ubuntu.com/usn/USN-2012-1, https://bugs.launchpad.net/ubuntu/%2Bsource/lightdm/%2Bbug/1243339, http://lists.freedesktop.org/archives/lightdm/2013-October/000471.html, http://lists.freedesktop.org/archives/lightdm/2013-October/000472.html.