It was discovered that libimager-perl, a Perl extension for generating 24-bit images, did not correctly handle 8-bit compressed images, which could allow the execution of arbitrary code.
For the stable distribution (etch), this problem has been fixed in version 0.50-1etch1.
We recommend that you upgrade your libimager-perl package.
MD5 checksums of the listed files are available in the original advisory.