The remote host is missing an update to unzip announced via advisory DSA 1522-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201522-1

Tavis Ormandy discovered that unzip, when processing specially crafted ZIP archives, could pass invalid pointers to the C library's free routine, potentially leading to arbitrary code execution (CVE-2008-0888). For the stable distribution (etch), this problem has been fixed in version 5.52-9etch1. For the old stable distribution (sarge), this problem has been fixed in version 5.52-1sarge5. The unstable distribution (sid) will be fixed soon. We recommend that you upgrade your unzip package.