Re: detection problem in client body

[Russ via Snort-users <snort-users () lists snort org>]

FYI - Snort 3 will alert as expected.

On 3/7/18 11:55 AM, Felix Erlacher via Snort-users wrote:
> Hi all,
>
> I am having a detection problem with an http_client_body rule. I tried
> to provide a minimal example in the attachments.
> post.pcapng contains two full tcp connections with one http request (and
> corresponding response) each. The first post request has 'foo' in the
> client body, the second post request has 'foo123' in the client body.
> test.rules contains a rule which is looking for the letter 'o' in the
> http_client_body.
> If I run snort in IDS mode, only the second post request is triggering
> an alert while the first post request does not although it also contains
> an 'o' in the client body. The only notable difference (to me) is the
> '123' added to the client body, which IMHO should not make any difference.
>
> Why is the first post request not triggering an alert?
>
> I am using the newest snort 2.9.11.1 with standard config (minimal
> changes, attached), snort output is attached. As can be seen, I am using
> the -k none switch.
>
> thx and regards
>
> Felix
>
>
>
>
>
>
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