libpng - several vulnerabilities

Several vulnerabilities have been discovered in libpng, a library for
reading and writing PNG files. The Common Vulnerabilities and
Exposures project identifies the following problems:

• CVE-2009-2042
  libpng does not properly parse 1-bit interlaced images with width values
  that are not divisible by 8, which causes libpng to include
  uninitialized bits in certain rows of a PNG file and might allow remote
  attackers to read portions of sensitive memory via “out-of-bounds
  pixels” in the file.
• CVE-2010-0205
  libpng does not properly handle compressed ancillary-chunk data that has
  a disproportionately large uncompressed representation, which allows
  remote attackers to cause a denial of service (memory and CPU
  consumption, and application hang) via a crafted PNG file

For the stable distribution (lenny), these problems have been fixed in
version 1.2.27-2+lenny3.

For the testing (squeeze) and unstable (sid) distribution, these
problems have been fixed in version 1.2.43-1

We recommend that you upgrade your libpng package.