oss-sec mailing list archives
Re: attacking hsts through ntp
From: Hanno Böck <hanno () hboeck de>
Date: Thu, 16 Oct 2014 23:07:13 +0200
I'm CC-ing Adam Langley, don't know if he is on this list. Am Thu, 16 Oct 2014 13:45:16 -0700 schrieb Michal Zalewski <lcamtuf () coredump cx>:
However, in section seven, where the author claims that preloaded entries are added for 1000 days, that's only via the net-internals debugging interface. (The code screenshot shown is also of code for that debugging interface.) I believe that preloaded entries in Chrome will always be enforced, no matter what the system time is.
Something can't be correct here. In the talk the attack was presented directly with chrome + google mail (which is one of the preloaded entries). Either he cheatet or the 1000 days limit applies to them, too (haven't done any tests myself). But basically, it may be debatable if browsers should consider preloaded entries as "forever". Independent of that I think the quesiton how date/time can be made more secure is worth investigation. tlsdate etc. certainly seem like a good idea to me. The OS default should be a secure timesetting method. If I understand it correct tlsdate uses the timestamp field of normal tls connections while ntp is a timesetting protocol on its own. I'm not into that stuff, can ntp be retrofittet with tls? Is that a good idea? Has it advantages/disadvantages compared to tlsdate? Still open is obviously the question: Who do you trust with your time? If your timeserver is compromised you still have an attack vector. -- Hanno Böck http://hboeck.de/ mail/jabber: hanno () hboeck de GPG: BBB51E42
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Current thread:
- attacking hsts through ntp Hanno Böck (Oct 16)
- Re: attacking hsts through ntp Kurt Seifried (Oct 16)
- Re: attacking hsts through ntp Lukas Reschke (Oct 16)
- Re: attacking hsts through ntp Hanno Böck (Oct 16)
- Re: attacking hsts through ntp Kurt Seifried (Oct 16)
- Re: attacking hsts through ntp Hanno Böck (Oct 16)
- Re: attacking hsts through ntp Kurt Seifried (Oct 16)
- Re: attacking hsts through ntp Michal Zalewski (Oct 16)
- Re: attacking hsts through ntp Hanno Böck (Oct 16)
- Re: attacking hsts through ntp Adam Langley (Oct 16)
- Re: attacking hsts through ntp Kurt Seifried (Oct 16)
- Re: attacking hsts through ntp Kurt Seifried (Oct 16)
- Re: attacking hsts through ntp Hanno Böck (Oct 17)
- Re: attacking hsts through ntp Yves-Alexis Perez (Oct 17)
- Re: attacking hsts through ntp Stephen Röttger (Oct 17)
- Re: attacking hsts through ntp Yves-Alexis Perez (Oct 18)
- Re: attacking hsts through ntp Stephen Röttger (Oct 20)
- RE: attacking hsts through ntp Bendler, Ehren (Oct 20)