Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
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

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.