FreeBSD Security Advisory FreeBSD-SA-09:15.ssl

<<On Thu, 3 Dec 2009 09:30:39 GMT, FreeBSD Security Advisories <security-advisories@xxxxxxxxxxx> 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).


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