Fix for TLS record tampering bug CVE-2013-4353

Author: snhenson

CHANGES

@@ -4,6 +4,11 @@
 
  Changes between 1.0.1e and 1.0.1f [xx XXX xxxx]
 
+  *) Fix for TLS record tampering bug. A carefully crafted invalid 
+     handshake could crash OpenSSL with a NULL pointer exception.
+     Thanks to Anton Johansson for reporting this issues.
+     (CVE-2013-4353)
+
   *) Keep original DTLS digest and encryption contexts in retransmission
      structures so we can use the previous session parameters if they need
      to be resent. (CVE-2013-6450)

NEWS

@@ -7,6 +7,7 @@
 
   Major changes between OpenSSL 1.0.1e and OpenSSL 1.0.1f [under development]
 
+      o Fix for TLS record tampering bug CVE-2013-4353
       o Fix for TLS version checking bug CVE-2013-6449
       o Fix for DTLS retransmission bug CVE-2013-6450
 

ssl/s3_both.c

@@ -210,7 +210,11 @@ static void ssl3_take_mac(SSL *s)
 	{
 	const char *sender;
 	int slen;
-
+	/* If no new cipher setup return immediately: other functions will
+	 * set the appropriate error.
+	 */
+	if (s->s3->tmp.new_cipher == NULL)
+		return;
 	if (s->state & SSL_ST_CONNECT)
 		{
 		sender=s->method->ssl3_enc->server_finished_label;