Al Viro and Alan Cox discovered several maths overflow errors in NetPBM, a set of graphics conversion tools. These programs are not installed setuid root but are often installed to prepare data for processing. These vulnerabilities may allow remote attackers to cause a denial of service or execute arbitrary code.
For the stable distribution (woody) this problem has been fixed in version 9.20-8.2.
The old stable distribution (potato) does not seem to be affected by this problem.
For the unstable distribution (sid) this problem has been fixed in version 9.20-9.
We recommend that you upgrade your netpbm package.
MD5 checksums of the listed files are available in the original advisory.