Re: [TLS] Another IRINA bug in TLS
Santiago Zanella-Beguelin <santiago@microsoft.com> Wed, 20 May 2015 16:58 UTC
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From: Santiago Zanella-Beguelin <santiago@microsoft.com>
To: "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] Another IRINA bug in TLS
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Date: Wed, 20 May 2015 16:58:06 +0000
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Archived-At: <http://mailarchive.ietf.org/arch/msg/tls/hDci_VBNeTeLUmFY7HVByKr_HpI>
Subject: Re: [TLS] Another IRINA bug in TLS
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Indeed, we are lazy and didn't want to write things like TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA in full. The extended master secret extension won't prevent the attack because the downgrade happens within the handshake and before key confirmation. If the signature in the ServerKeyExchange message covered a hash of the transcript so far (including the ciphersuite that the server chose), downgrading to "DHE_EXPORT" would no longer be possible. To be fair, it's not an "INRIA bug". It's joint work with U. Penn, U. Michigan, Johns Hopkins, and Microsoft Research (funded in part by the Microsoft Research-Inria joint centre in Paris). Cheers, --Santiago ________________________________________ From: TLS <tls-bounces@ietf.org> on behalf of Watson Ladd <watsonbladd@gmail.com> Sent: Wednesday, May 20, 2015 3:05 PM To: tls@ietf.org Subject: [TLS] Another IRINA bug in TLS https://weakdh.org/ Transcript hashing will solve this problem. In the meantime, you want to turn off DH_EXPORT. There are also implications for false start. Chrome has already announced countermeasures. I'm pretty sure this won't be the last issue of this nature. Sincerely, Watson Ladd _______________________________________________ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
- [TLS] Another IRINA bug in TLS Watson Ladd
- Re: [TLS] Another IRINA bug in TLS Tom Ritter
- Re: [TLS] Another IRINA bug in TLS Ilari Liusvaara
- Re: [TLS] Another IRINA bug in TLS Nikos Mavrogiannopoulos
- Re: [TLS] Another IRINA bug in TLS Aaron Zauner
- Re: [TLS] Another IRINA bug in TLS Nikos Mavrogiannopoulos
- Re: [TLS] Another IRINA bug in TLS Watson Ladd
- Re: [TLS] Another IRINA bug in TLS Salz, Rich
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Martin Rex
- Re: [TLS] Another IRINA bug in TLS Peter Gutmann
- Re: [TLS] Another IRINA bug in TLS Nikos Mavrogiannopoulos
- Re: [TLS] Another IRINA bug in TLS Nikos Mavrogiannopoulos
- Re: [TLS] Another IRINA bug in TLS Yuhong Bao
- Re: [TLS] Another IRINA bug in TLS Karthikeyan Bhargavan
- Re: [TLS] Another IRINA bug in TLS Florian Weimer
- Re: [TLS] Another IRINA bug in TLS Nikos Mavrogiannopoulos
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Peter Gutmann
- Re: [TLS] Another IRINA bug in TLS Yngve N. Pettersen
- Re: [TLS] Another IRINA bug in TLS Peter Gutmann
- Re: [TLS] Another IRINA bug in TLS Yoav Nir
- Re: [TLS] Another IRINA bug in TLS Antoine Delignat-Lavaud
- Re: [TLS] Another IRINA bug in TLS Florian Weimer
- Re: [TLS] Another IRINA bug in TLS Nikos Mavrogiannopoulos
- Re: [TLS] Another IRINA bug in TLS Florian Weimer
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Florian Weimer
- Re: [TLS] Another IRINA bug in TLS Nikos Mavrogiannopoulos
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Aaron Zauner
- Re: [TLS] Another IRINA bug in TLS Aaron Zauner
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Nikos Mavrogiannopoulos
- Re: [TLS] Another IRINA bug in TLS Dave Garrett
- Re: [TLS] Another IRINA bug in TLS Aaron Zauner
- Re: [TLS] Another IRINA bug in TLS Watson Ladd
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Dan Brown
- Re: [TLS] Another IRINA bug in TLS Watson Ladd
- Re: [TLS] Another IRINA bug in TLS Dan Brown
- Re: [TLS] Another IRINA bug in TLS Jeffrey Walton
- Re: [TLS] Another IRINA bug in TLS Nico Williams
- Re: [TLS] Another IRINA bug in TLS Peter Gutmann
- Re: [TLS] Another IRINA bug in TLS Jeffrey Walton
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Kurt Roeckx
- Re: [TLS] Another IRINA bug in TLS Karthikeyan Bhargavan
- Re: [TLS] Another INRIA bug in TLS Daniel Kahn Gillmor
- Re: [TLS] Another INRIA bug in TLS Andrei Popov
- Re: [TLS] Another INRIA bug in TLS Martin Thomson
- Re: [TLS] Another INRIA bug in TLS Martin Thomson
- Re: [TLS] Another IRINA bug in TLS Tony Arcieri
- Re: [TLS] Another INRIA bug in TLS Jeffrey Walton
- Re: [TLS] Another INRIA bug in TLS Tanja Lange
- Re: [TLS] Another IRINA bug in TLS Tanja Lange
- Re: [TLS] Another INRIA bug in TLS Andrey Jivsov
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another INRIA bug in TLS Martin Thomson
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another INRIA bug in TLS Karthikeyan Bhargavan
- Re: [TLS] Another IRINA bug in TLS Kurt Roeckx
- Re: [TLS] Another IRINA bug in TLS Kurt Roeckx
- Re: [TLS] Another INRIA bug in TLS Stephen Farrell
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another INRIA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Watson Ladd
- Re: [TLS] Another IRINA bug in TLS Jeffrey Walton
- Re: [TLS] Another IRINA bug in TLS Watson Ladd
- Re: [TLS] Another IRINA bug in TLS Peter Gutmann
- Re: [TLS] Another IRINA bug in TLS Karthikeyan Bhargavan
- Re: [TLS] Another IRINA bug in TLS Peter Gutmann
- Re: [TLS] Another IRINA bug in TLS Tanja Lange
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Peter Gutmann
- Re: [TLS] Another IRINA bug in TLS Santiago Zanella-Beguelin
- Re: [TLS] Another IRINA bug in TLS Andrey Jivsov
- Re: [TLS] Another IRINA bug in TLS Hubert Kario
- Re: [TLS] Another IRINA bug in TLS Hubert Kario
- Re: [TLS] Another IRINA bug in TLS Karthikeyan Bhargavan
- Re: [TLS] Another IRINA bug in TLS Karthikeyan Bhargavan
- Re: [TLS] Another IRINA bug in TLS Hubert Kario
- Re: [TLS] Another IRINA bug in TLS Daniel Kahn Gillmor
- Re: [TLS] Another IRINA bug in TLS Jeffrey Walton
- Re: [TLS] Another IRINA bug in TLS Andrei Popov
- Re: [TLS] Another IRINA bug in TLS Nico Williams
- Re: [TLS] Another INRIA bug in TLS Nico Williams