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Description of problem: If SecDefaultAction is changed to a disruptive action like "deny" most requests will be denied. Here is the upstream bug report. https://www.modsecurity.org/tracker/browse/CORERULES-36 Version-Release number of selected component (if applicable): mod_security-2.5.12-3.el5 Looks like it may also be in the latest el6 version as well. How reproducible: Very Steps to Reproduce: 1. Change SecDefaultAction in modsecurity_crs_10_config.conf to "phase:2,log,deny" 2. Restart apache 3. Try to view an image on the web server (or most any other binary) Actual results: Will get 403 http error Expected results: Will get the requested file Additional info: The fix is just to add "pass" to the rule in question.
Can check if this issue is still reproducible with the latest mod_security and mod_security_crs from epel-testing.