Date: Wed, 11 Aug 2021 10:31:58 -0500 From: Eric Blake <eblake@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: STARTTLS vulnerabilities On Wed, Aug 11, 2021 at 08:16:34AM +0200, Hanno Böck wrote: > Of course it's a very obvious idea for further research to look if one > finds similar vulnerabilities to the ones we found in other protocols. > So I'd really like to encourage other people to look for this. > > FWIW there are a lot of protocols with a STARTTLS mechanism, here's the > list of supported protocols by OpenSSL: > smtp > pop3 > imap > ftp > xmpp > xmpp-server > telnet > irc > mysql > postgres > lmtp > nntp > sieve > ldap Not mentioned in that list was ndb, but as far as I can tell, that project has already documented the ramifications of opportunistic encryption as being a security risk, and all known implementations (both servers and clients) with TLS support have a mode of execution that ensures the connection is dropped if a downgrade attack is attempted: https://github.com/NetworkBlockDevice/nbd/blob/master/doc/proto.md#security-considerations https://lists.debian.org/nbd/2021/08/msg00031.html But I welcome review from those with more experience from the security side of things. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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