The problem can be corrected by upgrading the affected package to
version 2.0.50-12ubuntu4.9 (for Ubuntu 4.10), 2.0.53-5ubuntu5.4 (for
Ubuntu 5.04), or 2.0.54-5ubuntu3 (for Ubuntu 5.10). In general, a
standard system upgrade is sufficient to effect the necessary changes.
A memory leak was found in the Apache 2 'worker' module in the
handling of aborted TCP connections. By repeatedly triggering this
situation, a remote attacker could drain all available memory, which
eventually led to a Denial of Service.