libtk-img - arbitrary code execution

Two buffer overflows have been found in the GIF image parsing code of
Tk, a cross-platform graphical toolkit, which could lead to the execution
of arbitrary code. The Common Vulnerabilities and Exposures project
identifies the following problems:

• CVE-2007-5137
  It was discovered that libtk-img is prone to a buffer overflow via
  specially crafted multi-frame interlaced GIF files.
• CVE-2007-5378
  It was discovered that libtk-img is prone to a buffer overflow via
  specially crafted GIF files with certain subimage sizes.

For the stable distribution (lenny), these problems have been fixed in
version 1.3-release-7+lenny1.

For the oldstable distribution (etch), these problems have been fixed in
version 1.3-15etch3.

For the testing distribution (squeeze) and the unstable distribution
(sid), these problems have been fixed in version 1.3-release-8.

We recommend that you upgrade your libtk-img packages.