Ilja van Sprundel of IOActive discovered several security issues in the
X.Org libXfont library, which may allow a local, authenticated user to
attempt to raise privileges; or a remote attacker who can control the
font server to attempt to execute code with the privileges of the X
server.
For the oldstable distribution (squeeze), these problems have been fixed in
version 1:1.4.1-5.
For the stable distribution (wheezy), these problems have been fixed in
version 1:1.4.5-4.
For the unstable distribution (sid), these problems have been fixed in
version 1:1.4.7-2.
We recommend that you upgrade your libxfont packages.