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visual2008_3086
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Oct 17, 2017

HTTP header X-XSS-Protection, X-Content-Type-Options issue

I am trying to insert the HTTP header X-XSS-Protection, X-Content-Type-Options in order to mitigate a security vunerability. I have found an irule solution, but when I implemented the solution, a code error appears.Can anyone share the correct syntax for this please? when HTTP_RESPONSE {

 

if { !([ HTTP::header exists "X-Content-Type-Options“ ])} { HTTP::header insert "X-Content-Type-Options" "'nosniff'" }

 

if { !([ HTTP::header exists "X-XSS-Protection“ ])} { HTTP::header insert "X-XSS-Protection" "1; mode=block" } }

01070151:3: Rule [/OHSBC/Ohsbc] error: /OHSBC/Ohsbc:17: error: [parse error: PARSE missingQuote 515 {missing "}][{ !([ HTTP::header exists "X-Content-Type-Options“ ])}] /OHSBC/Ohsbc:18: error: [parse error: PARSE missingQuote 645 {missing "}][{ !([ HTTP::header exists "X-XSS-Protection“ ])}]

 

  • You had an incorrect quotation mark at the end of your header type in the IF statement. This was preventing the close braces from working correctly.

     

    I've corrected the code:

     

    when HTTP_RESPONSE { 
        if {!([HTTP::header exists "X-Content-Type-Options" ])} { 
            HTTP::header insert "X-Content-Type-Options" "'nosniff'"
        }
    
        if {!([ HTTP::header exists "X-XSS-Protection"])} { 
            HTTP::header insert "X-XSS-Protection" "1; mode=block" 
        } 
    }
  • Hey

    I've only corrected you syntax

    when HTTP_RESPONSE {
    
    if { ! [HTTP::header exists "X-Content-Type-Options"] } { 
        HTTP::header insert "X-Content-Type-Options" "'nosniff'" 
    }
    
    if { ! [HTTP::header exists "X-XSS-Protection"] } { 
        HTTP::header insert "X-XSS-Protection" "1; mode=block" 
        } 
    }
    

    Now you should be able to create it.

    Please give me a feedback

    Regards

  • How can we verify that the iRule for XSS protection works? is there a command to verify the iRule works or a way to test it ?