full-disclosure - Re: SYN ACK scans to random ports

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Message-Id: <20130925105306.A4382A0153@smtp.hushmail.com>
Date: Wed, 25 Sep 2013 04:53:06 -0600
From: silence_is_best@...hmail.com
To: "Crist Clark" <cjclark@...m.mit.edu>
Cc: Full Disclogure <full-disclosure@...ts.grok.org.uk>
Subject: Re: SYN ACK scans to random ports



On 09/24/2013 at 10:29 PM, "Crist Clark"  wrote:

	Backscatter. Someone may be sending out spoofed SYNs. The target
sends SYN-ACKs to the spoofed source, you. What's the source port? A
well known service? Do the source addresses really have reachable
services on those ports?
  On Sep 24, 2013 7:25 AM,   wrote:
 Can someone explain the point of a SYN ACK scan to random high ports?
 I usually see a fair amount of these...at first I thought it was
maybe a block to an initiating SYN packet, but I don't see any
evidence that the SYN ACK isn't the first packet seen.  Danke. 
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That's a great point Crist I had not thought about that...thanks for
the insight.
 
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