On Thu, Mar 10, 2016 at 12:30 PM, Osiris dovecot@flut.demon.nl wrote:
On 09-03-16 13:14, djk wrote:
On 09/03/16 10:44, Florent B wrote:
Hi,
I don't see any SSL configuration option in Dovecot to disable "Client-initiated secure renegotiation".
It is advised to disable it as it can cause DDoS (CVE-2011-1473).
Is it possible to have this possibility through an SSL option or other ?
Thank you.
Florent ssl_protocols = !SSLv3 !SSLv2
Is that enough?
I'm afraid not. I've got SSLv2 and SSLv3 disabled and with
openssl s_client -connect $host:993I still can successfully renegotiate by passing a single 'R'.
Are you use good ssl_cipher_list (https://wiki.mozilla.org/Security/Server_Side_TLS)?
My config ## Service options # 10-ssl ssl = yes ssl_cert =
Work fine, but only testssl.sh scanner generate small warning "Secure Client-Initiated Renegotiation VULNERABLE (NOT ok), DoS threat"
openssl s_client -connect $host:993 -ssl2(3) and openssl s_client -connect $host:143 -starttls imap -showcerts -state -crlf -ssl2(3) break connection