The remote host is missing an update to libarchive1 announced via advisory DSA 1455-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201455-1

Several local/remote vulnerabilities have been discovered in libarchive1, a single library to read/write tar, cpio, pax, zip, iso9660, archives. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2007-3641 It was discovered that libarchive1 would miscompute the length of a buffer resulting in a buffer overflow if yet another type of corruption occurred in a pax extension header. CVE-2007-3644 It was discovered that if an archive prematurely ended within a pax extension header the libarchive1 library could enter an infinite loop. CVE-2007-3645 If an archive prematurely ended within a tar header, immediately following a pax extension header, libarchive1 could dereference a NULL pointer. The old stable distribution (sarge), does not contain this package. For the stable distribution (etch), these problems have been fixed in version 1.2.53-2etch1. For the unstable distribution (sid), these problems have been fixed in version 2.2.4-1. We recommend that you upgrade your libarchive package.