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

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Message-ID: <CAAcrURLf=KhSTzVnrprdOHz2SR30e=LBQe+nrPmVq=PVBKfjKA@mail.gmail.com>
Date: Tue, 24 Sep 2013 21:29:24 -0700
From: Crist Clark <cjclark@...m.mit.edu>
To: silence_is_best@...hmail.com
Cc: Full Disclogure <full-disclosure@...ts.grok.org.uk>
Subject: Re: SYN ACK scans to random ports

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, <silence_is_best@...hmail.com> 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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