[Snort-sigs] SOLVED - Trouble with HTTP status message rule

Joel Esler (jesler) jesler at ...3865...
Thu Mar 12 19:04:44 EDT 2015


Keep in mind from_server = to_client.


On Mar 12, 2015, at 6:02 PM, Research <research at ...4016...<mailto:research at ...4016...>> wrote:


On Mar 12, 2015, at 5:57 PM, Research <research at ...4016...<mailto:research at ...4016...>> wrote:

Hello,

I am currently writing a rather basic rule to track 404 resource not found instances in Snort on a web server.  While I am aware that the logs for the web server process themselves track this, I’d like to generate a Snort rule that does the same for some testing.

Currently my rule is:

alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS \
         (msg: "Web resource not found"; flow:established,to_server; content:"404"; http_stat_code; priority:4; sid:2000110; rev:001;)

I have used the http_stat_code modifier for the content, but when I attempt to locate a non-existent resource:

http://mywebserver.com/notthere

…the rule does not fire.

I was wondering what I am missing.

Thanks

Discovered what I was doing wrong.  Should have been tracking this as a response *FROM* the server, not inbound traffic.

The following rule solves the problem:

alert tcp $HOME_NET $HTTP_PORTS -> $EXTERNAL_NET any \
         (msg: "Web resource not found"; flow:established,from_server; content:"404"; http_stat_code; priority:4; sid:2000110; rev:001;)

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