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

Details

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 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: https://wiki.ubuntu.com/Security/Upgrades.

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

References

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