The remote host is missing updates announced in advisory CLA-2004:865.
zlib[1] is a compression library used by several programs.
Due to a Debian bug report[2], a denial of service vulnerability[2] was discovered in the zlib compression library versions 1.2.x, in the inflate() and inflateBack() functions. An attacker could exploit this vulnerability to launch a denial of service attack on any application using the zlib library. Older versions of zlib are not affected.
Solution: The apt tool can be used to perform RPM package upgrades by running 'apt-get update' followed by 'apt-get upgrade'