USN-1765-1: Apache HTTP Server vulnerabilities

Ubuntu Security Notice USN-1765-1

18th March, 2013

apache2 vulnerabilities

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

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


Several security issues were fixed in the Apache HTTP Server.

Software description

  • apache2 - Apache HTTP server


Niels Heinen discovered that multiple modules incorrectly sanitized certain
strings, which could result in browsers becoming vulnerable to cross-site
scripting attacks when processing the output. With cross-site scripting
vulnerabilities, if a user were tricked into viewing server output during a
crafted server request, a remote attacker could exploit this to modify the
contents, or steal confidential data (such as passwords), within the same
domain. (CVE-2012-3499, CVE-2012-4558)

It was discovered that the mod_proxy_ajp module incorrectly handled error
states. A remote attacker could use this issue to cause the server to stop
responding, resulting in a denial of service. This issue only applied to
Ubuntu 8.04 LTS, Ubuntu 10.04 LTS and Ubuntu 11.10. (CVE-2012-4557)

It was discovered that the apache2ctl script shipped in Ubuntu packages
incorrectly created the lock directory. A local attacker could possibly use
this issue to gain privileges. The symlink protections in Ubuntu 11.10 and
later should reduce this vulnerability to a denial of service.

Update instructions

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

Ubuntu 12.10:
apache2.2-common 2.2.22-6ubuntu2.2
Ubuntu 12.04 LTS:
apache2.2-common 2.2.22-1ubuntu1.3
Ubuntu 11.10:
apache2.2-common 2.2.20-1ubuntu1.4
Ubuntu 10.04 LTS:
apache2.2-common 2.2.14-5ubuntu8.11
Ubuntu 8.04 LTS:
apache2.2-common 2.2.8-1ubuntu0.25

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.


CVE-2012-3499, CVE-2012-4557, CVE-2012-4558, CVE-2013-1048