Re: Borderware predictable initial TCP

From: Roy Hills (Roy.Hills@NTA-MONITOR.COM)
Date: Wed Sep 09 1998 - 03:21:13 PDT

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    At 20:31 08/09/98 -0600, Ivan Arce,CORE SDI wrote:
    >Hmmm
    >NT+SP3, Pentium 233Mhz
    >How exploitable does this look:
    >
    > [List of consistent, predictable TCP sequence numbers deleted]
    >
    
    Looks like I was too quick to dismiss a one-per-millisecond sequence
    as "not predictable in the real world"!  Thanks for correcting me.
    
    I've also got a feeling that it may be possible to send multiple ACKs to the
    server and the incorrect ones might just get ignored - if this is true,
    then it
    would be possible to "bracket" the predicted sequence no. with multiple
    ACKs to increase the chance of success.  Does anyone know if this is
    really the case?
    
    Roy Hills
    NTA Monitor Ltd
    --
    Roy Hills                                    Tel:   01634 721855
    NTA Monitor Ltd                              FAX:   01634 721844
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