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mnocciolino's avatar
mnocciolino
Icon for Nimbostratus rankNimbostratus
Jan 10, 2018

What is the best way to block ajax requests?

I have a page running behind the F5, the application makes queries to a database through AJAX, however for a programming error they left part of the code open, and after the time we discovered that a user made queries from an application through the page through AJAX requests.

 

The error of the code was solved, blocking those queries.

 

The query is: what is the best way (with an IRULE LTM, ASM, etc.) to block all AJAX queries that come from a user?

 

Thank you very much.

 

ASM Advanced WAF
LTM
security

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  • nathe's avatar
    nathe
    Icon for Cirrocumulus rankCirrocumulus
    Jan 18, 2018

    What about an irule like this?

    when HTTP_REQUEST { 
if { [HTTP::header "X-Requested-With" ] equals "XMLHttpRequest" } { 
drop 
   } 
 }

    Or a custom ASM signature with the following rule?

    headercontent:"XMLHttpRequest"; nocase;

    To be honest, a bit of a punt this. Other DCers may come back and highlight major errors with these approaches 🙂