The remote host is missing updates announced in advisory CLA-2004:909.
netpbm[1] are tools for manipulating graphic files in many formats.
Utilities provided by the netpbm package prior to the 9.25 version contain defects[2] in temporary file handling. They create temporary files with predictable names without checking if the target file already exists.
Solution: The apt tool can be used to perform RPM package upgrades by running 'apt-get update' followed by 'apt-get upgrade'