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Date: Tue, 9 Sep 2014 15:22:36 +1000
From: Michael Samuel <>
Subject: Re: [CVE Requests] rsync and librsync collisions

[ A reminder - librsync is a different codebase and protocol to rsync ]

On 9 September 2014 15:06, Loganaden Velvindron <> wrote:
> Have the details been made public yet ?

The exploit code and example colliding blocks are not public, but I
don't believe it
would be hard to attempt your own exploit, especially against librsync
with default
parameters (a birthday attack is trivial).

There's an experimental patch for librsync:

Some review (especially by upstream) is required, and some agreement among users
on details is required.  See if you maintain
a downstream project (such as Duplicity).

I don't know what's happening with rsync upstream, there hasn't been much
communication.  I attempted a patch, but it got a bit hairy due to
hard-coded details in
the code (such as hash output length).


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