USN-1437-1: PHP vulnerability

4 May 2012

php5 vulnerability

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

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


Standalone PHP CGI scripts could be made to execute arbitrary code with the privilege of the web server.

Software Description

  • php5 - HTML-embedded scripting language interpreter


It was discovered that PHP, when used as a stand alone CGI processor for the Apache Web Server, did not properly parse and filter query strings. This could allow a remote attacker to execute arbitrary code running with the privilege of the web server. Configurations using mod_php5 and FastCGI were not vulnerable.

This update addresses the issue when the PHP CGI interpreter is configured using mod_cgi and mod_actions as described in /usr/share/doc/php5-cgi/README.Debian.gz; however, if an alternate configuration is used to enable PHP CGI processing, it should be reviewed to ensure that command line arguments cannot be passed to the PHP interpreter. Please see CVE-2012-2311 for more details and potential mitigation approaches.

Update instructions

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

Ubuntu 12.04 LTS
php5-cgi - 5.3.10-1ubuntu3.1
Ubuntu 11.10
php5-cgi - 5.3.6-13ubuntu3.7
Ubuntu 11.04
php5-cgi - 5.3.5-1ubuntu7.8
Ubuntu 10.04 LTS
php5-cgi - 5.3.2-1ubuntu4.15
Ubuntu 8.04 LTS
php5-cgi - 5.2.4-2ubuntu5.24

To update your system, please follow these instructions:

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