#3506: failure to check server certificate in SMTP TLS connection
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Reporter: db | Owner: mutt-dev
Type: defect | Status: new
Priority: major | Milestone:
Component: mutt | Version:
Keywords: |
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Hi mutt fails to check the validity of a SMTP servers certificate during a
TLS connection. In my mutt configuration I have
set ssl_starttls = yes
set ssl_force_tls = yes
However, after performing the steps below I found that mutt did not
properly validate the remote servers SMTP tls certificate. This means that
an attacker could potentially MITM a mutt user connecting to their SMTP
server even when the user has forced a TLS connection.
Steps to test this:
1. I set in my hosts file the ip for smtp.gmail.com to be bound to
mail.lolok.com
in /etc/hosts
74.125.127.109 mail.LOLOK.com
2.Then I changed my
set smtp_url = "smtp://[email protected]:587/"
to be
set smtp_url = "smtp://[email protected]:587/"
3. I opened up mutt and emailed my self. I note that I saw mutt say
"connecting to mail.lolok.com".
I feel that this is an issue because mutt _does_ actually perform IMAP
server certificate validation (at least it did when I last tested it :P).
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Ticket URL: <http://dev.mutt.org/trac/ticket/3506>
Mutt <http://www.mutt.org/>
The Mutt mail user agent
