The remote host is missing an update to clamav announced via advisory USN-754-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 8.10: libclamav5 0.94.dfsg.2-1ubuntu0.2 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-754-1

It was discovered that ClamAV did not properly verify its input when processing TAR archives. A remote attacker could send a specially crafted TAR file and cause a denial of service via infinite loop. It was discovered that ClamAV did not properly validate Portable Executable (PE) files. A remote attacker could send a crafted PE file and cause a denial of service (divide by zero).