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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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