Date: Wed, 04 Feb 2015 10:35:44 -0600 From: Mark Felder <feld@...d.me> To: oss-security@...ts.openwall.com Subject: Apache 2.4 mod_ssl SSLSessionTickets -- others vulnerable? >From the 2.4.12 changelog: *) mod_ssl: New directive SSLSessionTickets (On|Off). The directive controls the use of TLS session tickets (RFC 5077), default value is "On" (unchanged behavior). Session ticket creation uses a random key created during web server startup and recreated during restarts. No other key recreation mechanism is available currently. Therefore using session tickets without restarting the web server with an appropriate frequency (e.g. daily) compromises perfect forward secrecy. [Rainer Jung] So if you use Apache 2.4 and care about PFS protecting your data, you should turn this feature off. This appears to be an implementation issue because there is no other way for Apache to recreate keys. I don't know a lot about the fine details of Session Tickets, but can anyone care to comment if there are other known bad implementations of session tickets out there? Does this affect Apache 2.2? Nginx? Lighttpd? Thanks I find this bizarre that a known security weakness like this is left "on" by default...
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