Apache: buffer overflows and a possible information disclosure

Background

The Apache HTTP Server is one of the most popular web servers on the Internet.

Description

Multiple stack-based buffer overflows in mod_alias and mod_rewrite allow attackers who can create or edit configuration files including .htaccess files, to cause a denial of service and execute arbitrary code via a regular expression containing more than 9 captures, and a bug in the way mod_cgid handles CGI redirect paths could result in CGI output going to the wrong client when a threaded MPM is used, resulting in an information disclosure.

Impact

An attacker may cause a denial of service or execute arbitrary code with the privileges of the user that is running apache.

Workaround

There is no known workaround at this time.

Resolution

It is recommended that all Gentoo Linux users who are running net-misc/apache 2.x upgrade:

 # emerge sync
 # emerge -pv '>=www-servers/apache-2.0.48'
 # emerge '>=www-servers/apache-2.0.48'
 # emerge clean
 # /etc/init.d/apache2 restart

Please remember to update your config files in /etc/apache2 as --datadir has been changed to /var/www/localhost.