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From Tim Rohrer <>
Subject [users@httpd] Configuration issues leading to mod_security alerts?
Date Mon, 26 May 2014 18:30:57 GMT

I have a system set up where I use a reverse proxy (Apache/2.4.7 (Ubuntu 14.04LTS)), to reach
a content server (Apache/2.2.22 (Ubuntu 12.04LTS)). The content server is providing a Wordpress
(latest version) site. Two domains point to the external ip and the proxy server passes them
to the content server as either 80 or 443 traffic.  On the backend, a redirection occurs for
all 80 traffic to 443 which has 3rd party cert.

The reverse proxy is also providing caching.  The site seems to be working.

I then installed mod_security from the Ubuntu package libapache2-modsecurity, which I understand
to be ver 2.7.7-2, downloaded the CRS and turned it on with DetectionOnly.

However, every time the site is accessed, I get a significant number of alerts. And a significant
number of these seem related to cache (specifically Cache-Control Response Header Missing),
headers (Content-Type Headers missing), and cookies. Some include the tag of “MISCONFIGURATION”.

I’ve been reading how to scrub these for false-positives, but the number of them right now
makes me think I may have a configuration screwup, and I want to rule that out before I start
turning off rules.

I don’t want to indiscriminately dump logs or config files here but will provide what others
think is most valid.

Thanks in advance for any help getting pointed in the right direction.


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