The remote host is missing an update to libxml announced via advisory USN-89-1.
Several buffer overflows have been discovered in libxml's FTP connection and DNS resolution functions. Supplying very long FTP URLs or IP addresses might result in execution of arbitrary code with the privileges of the process using libxml.
This does not affect the core XML parsing code, which is what the majority of programs use this library for.
Note: The same vulnerability was already fixed for libxml2 in USN-10-1.
The following packages are affected: libxml1
Solution: The problem can be corrected by upgrading the affected package to version 1:1.8.17-8ubuntu0.1. In general, a standard system upgrade is sufficient to effect the necessary changes.