Re: [TLS] SCSV vs RI when both specified. Was: Updated draft
Martin Rex <mrex@sap.com> Tue, 12 January 2010 19:39 UTC
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From: Martin Rex <mrex@sap.com>
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To: dispensa@phonefactor.com
Date: Tue, 12 Jan 2010 20:39:15 +0100
In-Reply-To: <D0E89820-41D3-4263-9427-0FA0166F8CFC@phonefactor.com> from "Steve Dispensa" at Jan 12, 10 09:42:31 am
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Cc: DPKemp@missi.ncsc.mil, tls@ietf.org
Subject: Re: [TLS] SCSV vs RI when both specified. Was: Updated draft
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Steve Dispensa wrote: > > On Jan 12, 2010, at 9:17 AM, Marsh Ray wrote: > > > Martin Rex wrote: > >> > >> There is absolutely _NO_ known security problem and no > >> vulnerability for > >> a server to accept an initial handshake with the existing SSLv3, > >> TLSv1.0, > >> TLSv1.1 or TLSv1.2 protocol, even when the ClientHello handshake > >> message does neither contain SCSV nor an empty extension RI. > > > > Baloney! Steve and Marsh. There is a document, approved by the IESG, where both of you are listed as document co-authors, and it says this: http://tools.ietf.org/html/draft-ietf-tls-renegotiation-03#section-4.3 4.3. Server Considerations If the client does not offer the "renegotiation_info" extension or the TLS_RENEGO_PROTECTION_REQUEST SCSV then this indicates that the client does not support secure renegotiation. However, because the above attack looks like two handshakes to the server, the server can safely continue the connection as long as it does not allow the client to renegotiate. I'm fine with that "the server can safely continue the connection as long as it does not allow the client to renegotiate." I don't want to continue discussing this issue. -Martin
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Michael D'Errico
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Michael D'Errico
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Steve Checkoway
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Steve Checkoway
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Steve Checkoway
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Pasi.Eronen
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Yoav Nir
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Michael D'Errico
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Dr Stephen Henson
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Michael D'Errico
- Re: [TLS] SCSV vs RI when both specified - consen… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified - consen… Nasko Oskov
- Re: [TLS] SCSV vs RI when both specified - consen… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified - consen… Michael D'Errico
- Re: [TLS] SCSV vs RI when both specified - consen… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Yoav Nir
- Re: [TLS] SCSV vs RI when both specified - consen… Yoav Nir
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Kemp, David P.
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Ben Laurie
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Kemp, David P.
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Steve Dispensa
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Kemp, David P.
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Kemp, David P.
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Martin Rex
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Marsh Ray
- Re: [TLS] SCSV vs RI when both specified. Was: Up… Kyle Hamilton