Re: Mozilla Thunderbird SMTP down-negotiation weakness

Jason Haar <Jason.Haar@trimble.co.nz> wrote:
> Thunderbird explicitly allows you "TLS, if available" - which appears to 
> be what you refer to. However, there is a "TLS" - which means only do 
> TLS - and alert if the TLS certificate presented doesn't match a known 
> one (which would happen in a MITM).
>
> Are you referring to a bug in their "TLS" mode - or implying that "TLS, 
> if available" is somehow not... what it says it is...???
>
> Doesn't sound like a hole to me.

The "TLS, if available" option is common to most MUAs and is a serious
security problem.

Thunderbird has other security-related user interface problems. For
example, the account setup wizard creates accounts with insecure
settings by default and then encourages users to log in immediately
and compromise their passwords.

http://www.livejournal.com/users/fanf/39428.html

Tony.
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