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You are here:Home » Protect Application on Cloud Server With NAXSI

By Abhishek Ghosh October 27, 2014 9:09 am Updated on October 27, 2014

Protect Application on Cloud Server With NAXSI

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NAXSI is the final step for Nginx setup to protect from XSS and SQL injections. Here is basics to protect application on Cloud Server with Naxsi. You must have noticed that we have avoided Naxsi rules on basic guides on installation of WordPress on Nginx or more advanced guide to tweak nginx.conf.

 

Protect Application on Cloud Server With NAXSI

 

There are two commented out lines on /etc/nginx/sites-available/default :

/etc/nginx/sites-available/default
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# Uncomment to enable naxsi on this location
# include /etc/nginx/naxsi.rules

Before making these lines active, you must have Nginx–Naxsi compiled, otherwise naxsi.rules will not work.

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/root
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apt-get install nginx-naxsi

NAXSI can check and block GET, POST, HTTP headers and POST-request body by rules. NAXSI core rules are simple, but needs a bit learning. They block dangerous symbols, SQL related keywords and allows whitelist approach configuration creating a web application baseline. Obviously, if you uncomment include /etc/nginx/naxsi.rules and save the file and run nginx -t; if it returns error. Quite nicely written guide can be found on the official Wiki :

/root
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https://code.google.com/p/naxsi/wiki/Howto

Protect Application on Cloud Server With NAXSI

 

Protect Application on Cloud Server With NAXSI : With WordPress

 

WordPress-NAXSI is quite difficult setup and configuration varies from version to version. This is an example set of rules for WordPress 3.5 :

/etc/nginx/naxsi_core.rules
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# WP website itself
BasicRule wl:1005,1010,1011,1308,1309,1315 "mz:$HEADERS_VAR:cookie";
 
# WP login screen
BasicRule wl:1100 "mz:$ARGS_VAR:redirect_to";
BasicRule wl:1100 "mz:$BODY_VAR:redirect_to";
# WP backend
BasicRule wl:1000 "mz:URL|$URL:/wp/wp-admin/update-core.php";
BasicRule wl:1000 "mz:URL|$URL:/wp/wp-admin/update.php";
BasicRule wl:1000 "mz:$BODY_VAR:_wp_http_referer";
BasicRule wl:1000 "mz:$ARGS_VAR:action";
# load and load[] GET variable
BasicRule wl:1015 "mz:$ARGS_VAR:load";
BasicRule wl:1015 "mz:$ARGS_VAR:load[]";
# WP categories and add new
BasicRule wl:1310,1311 "mz:$URL:/wp/wp-admin/load-scripts.php|$ARGS_VAR:load[]|NAME";

The context is /etc/nginx/naxsi_core.rules. We can not provide you the result, but you should first run the command netstat -antup and save it as a text file for reference before starting working on WordPress-NAXSI. Basic rule for web app goes like this :

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# config mode section
LearningMode;
SecRulesEnabled;
#SecRulesDisabled;
DeniedUrl "/RequestDenied";
#
# check rules section
CheckRule "$SQL >= 8" BLOCK;
CheckRule "$RFI >= 8" BLOCK;
CheckRule "$TRAVERSAL >= 4" BLOCK;
CheckRule "$EVADE >= 4" BLOCK;
CheckRule "$XSS >= 8" BLOCK;

Tagged With modsecurity naxsi топ , naxsi xss rules
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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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