10

How do you disable modsecurity for just a specific directory. I'm getting errors in phpMyAdmin that are caused by modsecurity tripping based on rules. I have the following files set up:

# /etc/httpd/modsecurity.d/modsecurity_crs_15_customrules.conf
<LocationMatch "^/phpMA/">
    SecRuleEngine Off
</LocationMatch>

# /etc/httpd/modsecurity.d/modsecurity_crs_60.custom.conf
<LocationMatch '^/phpMA/*'>
    SecRuleRemoveById 950004
    SecRuleRemoveById 950005
    SecRuleRemoveById 950006
    SecRuleRemoveById 960010
    SecRuleRemoveById 960012
</LocationMatch>

From what I can find the first file should disable it, but it still trips, so I tried adding the rule IDs it is tripping to the 60 file, but it still complains.

I'm running the following packages on CentOS 5.3:

  • mod_security-2.5.0-jason.2
  • httpd-2.2.8-jason.3
  • mod-php5-apache2-zend-ce-5.2.10-65
16

SecRuleEngine Off must work . Have you tried to put SecRuleEngine inside Directory:

<Directory /var/www/site/phpMA>
SecRuleEngine Off
</Directory>

instead of LocationMatch ?

  • 1
    Tried adding that to the 15 file and still getting the same errors being caught in modsecurity_audit.log – dragonmantank Aug 21 '09 at 16:15
  • Are the files modsecurity_crs_15_customrules.conf and modsecurity_crs_60.custom.conf included (not commented) in your /etc/httpd/conf.d/mod_security.conf ? – hdanniel Aug 21 '09 at 16:28
  • facepalm No, they weren't. That took care of it. – dragonmantank Aug 21 '09 at 17:30
2

On some servers and web hosts, it's possible to disable ModSecurity via .htaccess, but only in its entirety (not individual rules).

To limit this to specific URLs you can specify a regex in the <If> statement below...

### DISABLE mod_security firewall
### Some rules are currently too strict and are blocking legitimate users
### We only disable it for URLs that contain the regex below
### The regex below should be placed between "m#" and "#" 
### (this syntax is required when the string contains forward slashes)
<IfModule mod_security.c>
  <If "%{REQUEST_URI} =~ m#/admin/#">
    SecFilterEngine Off
    SecFilterScanPOST Off
  </If>
</IfModule>
2

Never disable all rules !! This could cause serious security issues !

You need to check the logfile of modsecurity with

tail -f /var/log/apache2/modsec_audit.log

and exclude each rule one by one reproducing the errors on the phpmyadmin interface.

Next, add :

<Directory /path/to/phpmyadmin>
    <IfModule security2_module>
        SecRuleRemoveByTag "WEB_ATTACK/SQL_INJECTION"
        {And other rules you need to disable ...}
    </IfModule>
</Directory>

to /etc/apache2/mods-enabled/modsecurity.conf

The tag you need to remove will be in the log file like this. For a full description of removing rules for a particular folder, see the Github wiki of the project.

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