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Vulnerability Development: RE: Is there a hidden channel in Xauthentication?

RE: Is there a hidden channel in Xauthentication?

From: Klaus Frank <klausf_at_Pool.Informatik.RWTH-Aachen.DE>
Date: Tue, 22 May 2001 15:02:58 +0200 (MET DST)

Michael Wojcik wrote:

> In any case, it's easy enough to mask the time by using a hand-coded
> comparison loop that always compares all the bytes and sets a flag if any of
> them differ.

The flag would be set n times, where n is the number of matching bytes in the
two cookies... I'm afraid there is still a timing difference. An attempt to
mask the time differences can be found in gnuserv version 3.12, permitted().

Klaus Frank
Received on May 22 2001

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