Messages in this thread | | | Date | Thu, 22 Apr 2004 07:35:54 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: tcp vulnerability? haven't seen anything on it here... |
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On Thu, 22 Apr 2004, Giuliano Pochini wrote:
> > On 21-Apr-2004 David S. Miller wrote: > > On Wed, 21 Apr 2004 19:03:40 +0200 > > Jörn Engel <joern@wohnheim.fh-wedel.de> wrote: > > > >> Heise.de made it appear, as if the only news was that with tcp > >> windows, the propability of guessing the right sequence number is not > >> 1:2^32 but something smaller. They said that 64k packets would be > >> enough, so guess what the window will be. > > > > Yes, that is their major discovery. You need to guess the ports > > and source/destination addresses as well, which is why I don't > > consider this such a serious issue personally. > > Yes, but it is possible, expecially for long sessions. Also, > data injections is also possible with the same method, because > the receiver accepts everything inside the window, which is > usually 64k. Out of curiosity: in case Linux receives two > packets relative to the same portion of the stream, does it > check if the overlapping data is the same ? It would add extra > security about data injection in case the data has not been > sent to userspace yet. > >
Has anybody checked to see what Linux does if it receives a RST to the broadcast address? It would be a shame if all connections were dropped!
Cheers, Dick Johnson Penguin : Linux version 2.4.26 on an i686 machine (5557.45 BogoMips). Note 96.31% of all statistics are fiction.
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