oss-sec mailing list archives
Re: Truly scary SSL 3.0 vuln to be revealed soon:
From: Hanno Böck <hanno () hboeck de>
Date: Tue, 14 Oct 2014 13:15:41 +0200
Am Tue, 14 Oct 2014 10:41:40 +0000 schrieb Sona Sarmadi <sona.sarmadi () enea com>:
This is probably something under embargo which somehow has leaked out ... http://www.theregister.co.uk/2014/10/14/nasty_ssl_30_vulnerability_to_drop_tomorrow/
Whether it's scary or not I have an advice for you: Disable SSLv3. It causes a lot of headache already. I once had to debug a rather subtle issue in combination with SNI. The problem: Browsers downgrade out of protocol to SSLv3 if they can't connect via TLS. They do this in order to support broken server implementations. However this downgrade can also be triggered by bad or slow internet connections - and then you'll loose SNI. So sometimes your visitors will get the wrong certificate presented. I solved this for my servers by disabling SSLv3. It was a minor problem when I did this but it is almost no problem today. You will lock out IE6 users on Windows XP. However even people who use Windows XP+IE and installed their updates have TLS 1.0 support. I also encountered a small number of people who had manually disabled TLS 1.0 in firefox for unknown reasons. However this was a few years ago. Current Firefox versions make it harder to do this. I assume the reason was that they thought "v3 sound newer than v1.0". A number of people already recommend disabling SSLv3, e.g. the Qualys configuration guide. Disable it now - no matter if the rumors about a serious vuln are true, you'll be safe. cu, -- Hanno Böck http://hboeck.de/ mail/jabber: hanno () hboeck de GPG: BBB51E42
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Current thread:
- Truly scary SSL 3.0 vuln to be revealed soon: Sona Sarmadi (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Hanno Böck (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Reed Loden (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Alex Gaynor (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Reed Loden (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Reed Loden (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Hanno Böck (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Hanno Böck (Oct 14)
- RE: Truly scary SSL 3.0 vuln to be revealed soon: Sona Sarmadi (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Walter Parker (Oct 14)
- Re: Truly scary SSL 3.0 vuln to be revealed soon: Brandon Whaley (Oct 15)
- list policy (Re: Truly scary SSL 3.0 vuln to be revealed soon:) Solar Designer (Oct 15)
- Re: list policy (Re: Truly scary SSL 3.0 vuln to be revealed soon:) Alexander Cherepanov (Oct 28)
- Re: list policy (Re: Truly scary SSL 3.0 vuln to be revealed soon:) Kurt Seifried (Oct 28)
- RE: Truly scary SSL 3.0 vuln to be revealed soon: Sona Sarmadi (Oct 14)