Provide references for CVE-2012-6648.
Where can I find more information about CVE-2012-6648?
References are available at: https://launchpadlibrarian.net/96474113/gdm-guest-session.secure-cleanup.debdiff, https://bugs.launchpad.net/ubuntu/%2Bsource/lightdm/%2Bbug/953044, http://ubuntu.com/usn/usn-1399-1.