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Date: Thu, 3 Dec 2009 17:52:58 -0500
From: Garrett Wollman <wollman@bimajority.org>
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Subject: FreeBSD Security Advisory FreeBSD-SA-09:15.ssl
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<<On Thu, 3 Dec 2009 09:30:39 GMT, FreeBSD Security Advisories <security-advisories@freebsd.org> said:

> NOTE WELL: This update causes OpenSSL to reject any attempt to renegotiate
> SSL / TLS session parameters.  As a result, connections in which the other
> party attempts to renegotiate session parameters will break.  In practice,
> however, session renegotiation is a rarely-used feature, so disabling this
> functionality is unlikely to cause problems for most systems.

Actually, pretty much anyone who uses client certificates in an
enterprise environment is likely to have a problem with this, which is
why the IETF TLS working group is working on publishing a protocol
fix.  It looks like that RFC should be published, at Proposed
Standard, in a few weeks, and most vendors look prepared to release
implementations of the fix immediately thereafter (as soon as the
relevant constants are assigned by IANA).

-GAWollman