USN-787-1: Apache vulnerabilities

Ubuntu Security Notice USN-787-1

11th 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.

Update instructions

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

Ubuntu 9.04:
apache2-mpm-worker 2.2.11-2ubuntu2.1
apache2-mpm-event 2.2.11-2ubuntu2.1
apache2.2-common 2.2.11-2ubuntu2.1
apache2-mpm-prefork 2.2.11-2ubuntu2.1
Ubuntu 8.10:
apache2-mpm-worker 2.2.9-7ubuntu3.1
apache2-mpm-event 2.2.9-7ubuntu3.1
apache2.2-common 2.2.9-7ubuntu3.1
apache2-mpm-prefork 2.2.9-7ubuntu3.1
Ubuntu 8.04 LTS:
apache2-mpm-worker 2.2.8-1ubuntu0.8
apache2-mpm-event 2.2.8-1ubuntu0.8
apache2.2-common 2.2.8-1ubuntu0.8
apache2-mpm-prefork 2.2.8-1ubuntu0.8
apache2-mpm-perchild 2.2.8-1ubuntu0.8
Ubuntu 6.06 LTS:
apache2-mpm-worker 2.0.55-4ubuntu2.5
apache2-mpm-perchild 2.0.55-4ubuntu2.5
libapr0 2.0.55-4ubuntu2.5
apache2-mpm-prefork 2.0.55-4ubuntu2.5
apache2-common 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.


CVE-2009-0023, CVE-2009-1191, CVE-2009-1195, CVE-2009-1955, CVE-2009-1956