USN-787-1: Apache vulnerabilities

11 June 2009

apache2 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS
  • Ubuntu 6.06 LTS

Software Description

  • apache2


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)

Update instructions

The problem can be corrected by updating your system to the following package versions:

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
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 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 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

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to effect the necessary changes.