The remote host is missing updates announced in advisory CLSA-2005:1007.
netpbm are tools for manipulating graphic files in many formats.
pstopnm did not properly use the '-dSAFER' option when calling Ghostscript to convert a PostScript file into a PBM, PGM, or PNM file, which allows remote attackers to execute arbitrary commands.
Solution: The apt tool can be used to perform RPM package upgrades by running 'apt-get update' followed by 'apt-get upgrade'