full-disclosure - Re: Mutt: failure to check server certificate in SMTP TLS connection

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Message-ID: <AANLkTimaCROCOg=4qKd5=jJrLQtxg=hSN1UH84kkc17q@mail.gmail.com>
Date: Wed, 23 Mar 2011 00:40:06 +1100
From: dave b <db.pub.mail@...il.com>
To: Honza Horak <hhorak@...hat.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Mutt: failure to check server certificate in
 SMTP TLS connection

> Hi,
>
> I've tested this behaviour using both - gnutls and openssl - and it seems
> like the only difference is that there is an error printed using openssl:
> "Certificate host check failed: certificate owner does not match hostname
> imap.myhost.web".
>
> In both cases a user can accept the certificate, but there is no warning
> about certificate's hostname mishmash using gnutls, which is a
> vulnerability.
>
> I just wanted to sum up the issue, do I understand it correctly?
>

Yes and no. The thing is with gnutls if the certificate is valid for
another host - like I had in my test example then gnutls will not show
the error and will continue as if there is no error.
Obviously if the host has a certificate that is not 'valid' (e.g. self
signed) mutt will
prompt and ask for you to accept it first .

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