'The mod_proxy_ajp module in the Apache HTTP Server before 2.2.21, when used with mod_proxy_balancer in certain configurations, allows remote attackers to cause a denial of service (temporary “error state” in the backend server) via a malformed HTTP request.'
This issue does not affect ClearOS 5.x. In ClearOS 6.x, This issue was resolved in a backported fix. Current up to date versions not affected.
This issue does not affect ClearOS 5.x or earlier versions of Apache because the bug was introduced in a later version of Apache. This issue was resolved in httpd-2.2.15-9.el6 (ClearOS 6.x). Current versions meet or exceed this minor release.
For ClearOS 5.x, no action is necessary. For ClearOS 6.x, validate that you are running httpd-2.2.15-9.el6 (ClearOS 6.x) or later, run the following:
rpm -qi httpd
If you need to update, run the following: