Todd Ouska - 2009-11-12

Hi!  We’ve been getting a number of questions about the high profile
vulnerabilities in OpenSSL, GnuTLS, NSS and mod_ssl.

This vulnerability is based on a potentially insecure SSL early feature that
yaSSL chose to never support in the first place.  As such, yaSSL was never

More details on the issue can be found below:

From CVE:

“The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in
Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP
Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier,
Mozilla Network Security Services (NSS) 3.12.4 and earlier, and other products,
does not properly associate renegotiation handshakes with an existing
connection, which allows man-in-the-middle attackers to insert data into HTTPS
sessions, and possibly other types of sessions protected by TLS or SSL, by
sending an unauthenticated request that is processed retroactively by a server
in a post-renegotiation context, related to a "plaintext injection" attack, aka
the "Project Mogul" issue.”