The remote host is missing an update to apache2 announced via advisory USN-787-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: apache2-common 2.0.55-4ubuntu2.5 apache2-mpm-perchild 2.0.55-4ubuntu2.5 apache2-mpm-prefork 2.0.55-4ubuntu2.5 apache2-mpm-worker 2.0.55-4ubuntu2.5 libapr0 2.0.55-4ubuntu2.5 Ubuntu 8.04 LTS: apache2-mpm-event 2.2.8-1ubuntu0.8 apache2-mpm-perchild 2.2.8-1ubuntu0.8 apache2-mpm-prefork 2.2.8-1ubuntu0.8 apache2-mpm-worker 2.2.8-1ubuntu0.8 apache2.2-common 2.2.8-1ubuntu0.8 Ubuntu 8.10: apache2-mpm-event 2.2.9-7ubuntu3.1 apache2-mpm-prefork 2.2.9-7ubuntu3.1 apache2-mpm-worker 2.2.9-7ubuntu3.1 apache2.2-common 2.2.9-7ubuntu3.1 Ubuntu 9.04: apache2-mpm-event 2.2.11-2ubuntu2.1 apache2-mpm-prefork 2.2.11-2ubuntu2.1 apache2-mpm-worker 2.2.11-2ubuntu2.1 apache2.2-common 2.2.11-2ubuntu2.1 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-787-1

Matthew Palmer discovered an underflow flaw in apr-util as included in Apache. An attacker could cause a denial of service via application crash in Apache using a crafted SVNMasterURI directive, .htaccess file, or when using mod_apreq2. This issue only affected Ubuntu 6.06 LTS. (CVE-2009-0023) Sander de Boer discovered that mod_proxy_ajp would reuse connections when a client closed a connection without sending a request body. A remote attacker could exploit this to obtain sensitive response data. This issue only affected Ubuntu 9.04. (CVE-2009-1191) Jonathan Peatfield discovered that Apache did not process Includes options correctly. With certain configurations of Options and AllowOverride, a local attacker could use an .htaccess file to override intended restrictions and execute arbitrary code via a Server-Side-Include file. This issue affected Ubuntu 8.04 LTS, 8.10 and 9.04. (CVE-2009-1195) It was discovered that the XML parser did not properly handle entity expansion. A remote attacker could cause a denial of service via memory resource consumption by sending a crafted request to an Apache server configured to use mod_dav or mod_dav_svn. This issue only affected Ubuntu 6.06 LTS. (CVE-2009-1955) C. Michael Pilato discovered an off-by-one buffer overflow in apr-util when formatting certain strings. For big-endian machines (powerpc, hppa and sparc in Ubuntu), a remote attacker could cause a denial of service or information disclosure leak. All other architectures for Ubuntu are not considered to be at risk. This issue only affected Ubuntu 6.06 LTS. (CVE-2009-1956)