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