Multiple integer overflows in X.org libXp 1.0.1 and earlier allow X servers to trigger allocation of insufficient memory and a buffer overflow via vectors related to the (1) XpGetAttributes, (2) XpGetOneAttribute, (3) XpGetPrinterList, and (4) XpQueryScreens functions.
http://www.x.org/wiki/Development/Security/Advisory-2013-05-23
http://www.ubuntu.com/usn/USN-1861-1
http://www.openwall.com/lists/oss-security/2013/05/23/3
http://www.debian.org/security/2013/dsa-2685
http://lists.opensuse.org/opensuse-updates/2013-06/msg00170.html