mod_security rule [Id '-1'] triggered! ModSecurity: Access denied with code 403

While updating the contents in any of the CMS, I was getting 403 error on litespeed server.

Below are the Error log - (tail -f /usr/local/apache/logs/error_log | grep IP address )

2016-11-02 19:55:14.148 [NOTICE] [IP Address :HTTP2-1] mod_security rule [Id '-1'] triggered!
[Wed Nov 2 19:55:14 2016] [error] ModSecurity: Access denied with code 403,
[Rule: 'TX:0' '!@pmFromFile userdata_wl_content_type']
2016-11-02 19:55:14.148 [NOTICE] [IP Address:54100:HTTP2-1] Content len: 1276, Request line:
'PUT /ajax/api/static-pages/2 HTTP/1.1'
2016-11-02 19:55:14.148 [INFO] [IP Address49:54100:HTTP2-1] Cookie len: 36,
2016-11-02 19:55:14.148 [NOTICE] [IP Address:54100:HTTP2-1] Redirect: #1,
URL: /index.php
2016-11-02 19:55:14.148 [INFO] [IP Address:54100:HTTP2-1] File not found

Solution :-

1. Find out the mod security rules which are triggered by checking apache error logs. You can also check the modsec audit logs.
Apache error logs - tail -f /usr/local/apache/logs/error_log | grep IP address
Mod security audit log location - /usr/local/apache/logs/modsec_audit.log

2. You can also check the rules which are being triggered from WHM >> Mod Security Tools.

3. Once you'll got the rule, white-list them from WHM >> ConfigServer ModSecurity Control. You can either globally white-list the rule or can white-list for particular user.

Globally white-listing the mod security rule - WHM >> ConfigServer ModSecurity Control >> ModSecurity rule ID list >> Enter the Rule ID >> Save Global whitelist.

White-listing the mod security rule for particular user - WHM >> ConfigServer ModSecurity Control >> Select the user from drop-down list >> Modify User whitelist >> ModSecurity rule ID list >> Save whitelist for all accessible domain.

4. If there is still error then please use debug tool in your web-browser, find out the HTTP header. HTTP Headers tell you the content type and white-list those contents type on server on below file -

You'll need to do below server wide changes -

cd /usr/local/apache
Put your Content-Type in whitelist here -
cat /etc/apache2/conf.d/modsec_vendor_configs/comodo_apache/userdata_wl_content_type

Below are the some example header type for you reference -


5. Rebulit the 'httpdconf' file - /scripts/rebuildhttpdconf

6. Restart the 'litespeed' service - service lsws restart

Now, try to replicate the issue, it will be fixed. 

Note :- You can usually use Chome/Firefox developer tools to get the HTTP header ( right click on page >> Inspect Element).

Let me know if you've any thoughts

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