USN-1765-1: Apache HTTP Server vulnerabilities

18 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. (CVE-2013-1048)

Update instructions

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

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.