Date: Tue, 5 Aug 2014 14:38:05 +1000 From: Michael Samuel <mik@...net.net> To: oss-security@...ts.openwall.com Subject: Re: Re: Possible CVE request: subversion MD5 collision authentication leak On 5 August 2014 08:32, Ben Reser <ben@...er.org> wrote: > I think your understanding of the current state of MD5 collision attacks is out > of date. Chosen prefix attacks are possible. See: > http://www.win.tue.nl/hashclash/ChosenPrefixCollisions/ > > The MD5 hash is created off the data in the following format: > <$URL> $REALM > > An attacker trying to take advantage of this only needs the $URL portion to > match their server. The $REALM can then be whatever data is required to make > the MD5 hash match the system they are trying to attack. Just to clarify - does the attacker have control of both $REALM parameters? A chosen prefix collision still requires the attacker provide both inputs (or at-least the suffix to both inputs). Regards, Michael
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