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From 88ae012c8092852f03c50f6461175271104b4c8a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilia=20K=C3=A4sper?= <emilia@openssl.org>
Date: Thu, 24 Jul 2014 22:15:29 +0200
Subject: [PATCH] Fix DTLS anonymous EC(DH) denial of service
CVE-2014-3510
Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
---
ssl/d1_clnt.c | 23 +++++++++++++++++++++--
ssl/s3_clnt.c | 7 +++++++
2 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/ssl/d1_clnt.c b/ssl/d1_clnt.c
index 65dbb4a..fd6562c 100644
--- a/ssl/d1_clnt.c
+++ b/ssl/d1_clnt.c
@@ -996,6 +996,13 @@ int dtls1_send_client_key_exchange(SSL *s)
RSA *rsa;
unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
+ if (s->session->sess_cert == NULL)
+ {
+ /* We should always have a server certificate with SSL_kRSA. */
+ SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
if (s->session->sess_cert->peer_rsa_tmp != NULL)
rsa=s->session->sess_cert->peer_rsa_tmp;
else
@@ -1186,6 +1193,13 @@ int dtls1_send_client_key_exchange(SSL *s)
{
DH *dh_srvr,*dh_clnt;
+ if (s->session->sess_cert == NULL)
+ {
+ ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
+ SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
+ goto err;
+ }
+
if (s->session->sess_cert->peer_dh_tmp != NULL)
dh_srvr=s->session->sess_cert->peer_dh_tmp;
else
@@ -1245,6 +1259,13 @@ int dtls1_send_client_key_exchange(SSL *s)
int ecdh_clnt_cert = 0;
int field_size = 0;
+ if (s->session->sess_cert == NULL)
+ {
+ ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
+ SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
+ goto err;
+ }
+
/* Did we send out the client's
* ECDH share for use in premaster
* computation as part of client certificate?
@@ -1720,5 +1741,3 @@ int dtls1_send_client_certificate(SSL *s)
/* SSL3_ST_CW_CERT_D */
return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
}
-
-
diff --git a/ssl/s3_clnt.c b/ssl/s3_clnt.c
index 2afb892..df05f78 100644
--- a/ssl/s3_clnt.c
+++ b/ssl/s3_clnt.c
@@ -2253,6 +2253,13 @@ int ssl3_send_client_key_exchange(SSL *s)
RSA *rsa;
unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
+ if (s->session->sess_cert == NULL)
+ {
+ /* We should always have a server certificate with SSL_kRSA. */
+ SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
if (s->session->sess_cert->peer_rsa_tmp != NULL)
rsa=s->session->sess_cert->peer_rsa_tmp;
else
--
1.8.3.1