X.Org X server before 1.13.4 and 1.4.x before 1.14.1 does not properly restrict access to input events when adding a new hot-plug device, which might allow physically proximate attackers to obtain sensitive information, as demonstrated by reading passwords from a tty.
https://bugs.freedesktop.org/show_bug.cgi?id=63353
http://www.ubuntu.com/usn/USN-1803-1
http://www.openwall.com/lists/oss-security/2013/04/18/3
http://www.debian.org/security/2013/dsa-2661
http://lists.opensuse.org/opensuse-updates/2013-06/msg00015.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/104089.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/102391.html