Date: Wed, 11 Aug 2021 09:51:04 +0200 From: Hanno Böck <hanno@...eck.de> To: oss-security@...ts.openwall.com Subject: Re: STARTTLS vulnerabilities On Wed, 11 Aug 2021 08:09:57 +0100 Matthew Wild <mwild1@...il.com> wrote: > XMPP has some additional protections against this in its design. It is > required, after TLS negotiation, for both parties to discard the > pre-TLS XML stream and negotiate a new one after TLS has been > established. This is actually not much different from how STARTTLS works in SMTP or IMAP. You are basically advised to throw away all state from pre-TLS. But yet here we are with > 40 vulnerabilities. The buffering issue is really subtle if you look at how such code is written. It's basically "if you implement this with C API file descriptors you will very likely create this bug *unless* you're aware of it and actively avoid it". And I don't see how XMPP would be any different here. -- Hanno Böck https://hboeck.de/
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