Re: Learning more about alerts

["Tom Peters (thopeter)" <thopeter () cisco com>]

Rowell,

There are two ways HTTP headers can specify the length of the message body. They can specify the total length using the 
Content-Length header or they can specify "chunked" using the Transfer-Encoding header. Chunks are a sequence of 
individual body pieces each with their own length header. Chunks work well when the server is making up the response as 
it goes along and does not know the length up front.

Normally when an HTTP server sends a response that includes a body you will see one header or the other so the client 
knows what to expect. When neither one is present you get this alert.

Tom



From: Rowell Dionicio <RDionicio () infracore net<mailto:RDionicio () infracore net>>
Date: Wednesday, July 23, 2014 12:21 PM
To: "Snort Users List (snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>)" <snort-users 
() lists sourceforge net<mailto:snort-users () lists sourceforge net>>
Subject: [Snort-users] Learning more about alerts

Hi,

I’m new to Snort and just started tuning it. I’m getting a lot of:

http_inspect: NO CONTENT-LENGTH OR TRANSFER-ENCODING IN HTTP RESPONSE

I don’t want to rule anything out without inspecting it and knowing what it really means. What resource can I use to 
look into these various alerts?

Thank you,

Rowell

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