diff --git a/extra/yassl/src/handshake.cpp b/extra/yassl/src/handshake.cpp index aa2de39333c0d..bb8e37915528c 100644 --- a/extra/yassl/src/handshake.cpp +++ b/extra/yassl/src/handshake.cpp @@ -787,6 +787,16 @@ int DoProcessReply(SSL& ssl) needHdr = true; else { buffer >> hdr; + /* + According to RFC 4346 (see "7.4.1.3. Server Hello"), the Server Hello + packet needs to specify the highest supported TLS version, but not + higher than what client requests. YaSSL highest supported version is + TLSv1.1 (=3.2) - if the client requests a higher version, downgrade it + here to 3.2. + See also Appendix E of RFC 5246 (TLS 1.2) + */ + if (hdr.version_.major_ == 3 && hdr.version_.minor_ > 2) + hdr.version_.minor_ = 2; ssl.verifyState(hdr); }