Re: [TLS] Another IRINA bug in TLS

Karthikeyan Bhargavan <karthik.bhargavan@gmail.com> Thu, 21 May 2015 07:53 UTC

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From: Karthikeyan Bhargavan <karthik.bhargavan@gmail.com>
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Date: Thu, 21 May 2015 00:53:29 -0700
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To: Nikos Mavrogiannopoulos <nmav@redhat.com>
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Subject: Re: [TLS] Another IRINA bug in TLS
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From the protocol point of view, this is yet another instance of the “cross-protocol attack” [1.2]
as we note in the longer version of the paper. The DHE_EXPORT signature can be used 
with DHE, enabling the attack.

[1] D. Wagner and B. Schneier. Analysis of the SSL 3.0 protocol. In 2nd Usenix Workshop on Electronic Commerce, 1996. 
[2] N. Mavrogiannopoulos, F. Vercauteren, V. Velichkov, and B. Preneel. A cross-protocol attack on the TLS protocol. In ACM CCS, pages 62–72, 2012.


On 21 May 2015, at 00:46, Nikos Mavrogiannopoulos <nmav@redhat.com>; wrote:

> On Wed, 2015-05-20 at 12:23 -0400, Watson Ladd wrote:
> 
>> They do mean DHE_EXPORT to refer to dhe_rsa_export and dhe_dss_export,
>> as "defined" in RFC 2246. These are ciphersuite values.
> 
> I stand corrected. It is an interesting attack, but it is very
> surprising to see ghosts like these ciphersuites present in real
> servers.
> 
> regards,
> Nikos
> 
> 
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