The remote host is missing an update to apache2 announced via advisory USN-802-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: apache2-common 2.0.55-4ubuntu2.6 apache2-mpm-perchild 2.0.55-4ubuntu2.6 apache2-mpm-prefork 2.0.55-4ubuntu2.6 apache2-mpm-worker 2.0.55-4ubuntu2.6 libapr0 2.0.55-4ubuntu2.6 Ubuntu 8.04 LTS: apache2-mpm-event 2.2.8-1ubuntu0.10 apache2-mpm-perchild 2.2.8-1ubuntu0.10 apache2-mpm-prefork 2.2.8-1ubuntu0.10 apache2-mpm-worker 2.2.8-1ubuntu0.10 apache2.2-common 2.2.8-1ubuntu0.10 Ubuntu 8.10: apache2-mpm-event 2.2.9-7ubuntu3.2 apache2-mpm-prefork 2.2.9-7ubuntu3.2 apache2-mpm-worker 2.2.9-7ubuntu3.2 apache2.2-common 2.2.9-7ubuntu3.2 Ubuntu 9.04: apache2-mpm-event 2.2.11-2ubuntu2.2 apache2-mpm-prefork 2.2.11-2ubuntu2.2 apache2-mpm-worker 2.2.11-2ubuntu2.2 apache2.2-common 2.2.11-2ubuntu2.2 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-802-1

It was discovered that mod_proxy_http did not properly handle a large amount of streamed data when used as a reverse proxy. A remote attacker could exploit this and cause a denial of service via memory resource consumption. This issue affected Ubuntu 8.04 LTS, 8.10 and 9.04. (CVE-2009-1890) It was discovered that mod_deflate did not abort compressing large files when the connection was closed. A remote attacker could exploit this and cause a denial of service via CPU resource consumption. (CVE-2009-1891)