The remote host is missing an update to zip announced via advisory DSA 624-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20624-1

A buffer overflow has been discovered in zip, the archiver for .zip files. When doing recursive folder compression the program did not check the resulting path length, which would lead to memory being overwritten. A malicious person could convince a user to create an archive containing a specially crafted path name, which could lead to the execution of arbitrary code. For the stable distribution (woody) this problem has been fixed in version 2.30-5woody2. For the unstable distribution (sid) this problem has been fixed in version 2.30-8. We recommend that you upgrade your zip package.