Re: Rule "GET or HEAD Request with Body Content." is catching a "POST" method

Christian Varas <[email protected]> Tue, 23 Apr 2019 12:13:31 -0400
Newsgroups	gmane.comp.apache.mod-security.user
Message-ID	<[email protected]>
Thanks  Ervin,

I didin't note the size of Content-Lenght, for sure this is not a normal
request :P

Cheers.

El 22-04-19 a las 17:10, Ervin Hegedüs escribió:
> Hi Christian,
>
> On Mon, Apr 22, 2019 at 04:22:27PM -0300, Christian Varas wrote:
>> Hello, i'm having a small issue with modsecurity and nginx
>>
>> I'm getting the following blocking with the rule "GET or HEAD Request
>> with Body Content."
>>
>> The thing is that this rule is catching a wrong method.
>>
>> I'm sending this POST with a normal body content
> I think this isn't a "normal" request :)
>
>> *POST* /informacion-general-de-bomberos HTTP/1.1
>> Host: www.bomberos.cl
>> Content-Length: 33480
> ^^^^^^^^^^^^^^^^^^^^^^^
>
>> Cache-Control: max-age=0
> ...
>
>> Connection: close
> the body starts here:
>
>> ------WebKitFormBoundary85SDZfedhQBpvDB6
>> Content-Disposition: form-data; name="q"
>>
>> #
>> ------WebKitFormBoundary85SDZfedhQBpvDB6
>> Content-Disposition: form-data; name="option"
>>
>> com_contenido
>> ------WebKitFormBoundary85SDZfedhQBpvDB6
>> Content-Disposition: form-data; name="Itemid"
>>
>> 647
>> ------WebKitFormBoundary85SDZfedhQBpvDB6
>> Content-Disposition: form-data; name="task"
>>
>> buscarContenido
>> ------WebKitFormBoundary85SDZfedhQBpvDB6--
> the length of the bidy is 424 char (plus the CR characters at the
> end of the lines, they are 17 - so 424+17 = 441).
>  
>> "headers":{"Accept":"text/html...", ... ,"Content-Length":"441"
>> "components":["OWASP_CRS/3.1.0\""**]*},"messages":[{"message":"GET or HEAD Request with Body Content.","details":{"match":"Matched \"Operator `Rx' with parameter `^0?$' against variable `REQUEST_HEADERS:Content-Length' (Value: `441')",
> I think the Nginx waits a 33480 length body, but only got 441 - I
> assume that this is a unique Nginx behavior....
>
> I've tried your request, only replaced the Content-Length to 424,
> and everything worked well.
>
> Hope this helps.
>
>
> a.
>
>
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-- 

Chris

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