Snort mailing list archives

Re: Stream5 question


From: "tung tran" <tunghack () gmail com>
Date: Tue, 8 Apr 2008 02:29:25 -0400

Hi all,
I should also mention that I tested this issue with the newest version
of Snort. However, I had to send the packet (with invalid sequence and
ack numbers) repeatedly 3 times (to Snort) before Snort passed one of
the packets down to the detection engine ( I wrote a rule to check
this)
Thanks,

On Tue, Apr 8, 2008 at 2:12 AM, tung tran <tunghack () gmail com> wrote:
Hi all,
 My question is: "is is true that even though Stream5 preprocessor is
 on (with necessary directives set), Snort always passes a packet down
 to the detection engine even though the packet has invalid sequence
 number/ acknowledge number which is not expected by the receiver and
 the packet is normally discarded by the receiver ?". Is there a way to
 tell Snort not to passes packets with invalid sequence/acknowledge
 numbers down to the detection engine? I tested this with the newest
 version of Snort.
 Thanks,
 Tung.


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