intrigeri uploaded new packages for xorg-server which fixed the
following security problem:

CVE-2013-4396
  Pedro Ribeiro discovered a use-after-free in the handling of
  ImageText requests in the Xorg Xserver, which could result in denial
  of service or privilege escalation.

  https://security-tracker.debian.org/tracker/CVE-2013-4396
  http://www.debian.org/security/2013/dsa-2784

For the squeeze-backports distribution, this problem has been fixed in
version 1.10.4-1~bpo60+2.

For the oldstable distribution (squeeze), this problem has been fixed
in version 1.7.7-17.

For the stable distribution (wheezy), this problem has been fixed in
version 1.12.4-6+deb7u1.

For the testing (jessie) and unstable (sid) distributions, this
problem has been fixed in version 1.14.3-4.