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From ff553f837172ecb2b5c8eca257ec3c5619a4b299 Mon Sep 17 00:00:00 2001
From: "Dr. Stephen Henson" <steve@openssl.org>
Date: Sat, 17 Sep 2016 12:36:58 +0100
Subject: [PATCH] Fix small OOB reads.

In ssl3_get_client_certificate, ssl3_get_server_certificate and
ssl3_get_certificate_request check we have enough room
before reading a length.

Thanks to Shi Lei (Gear Team, Qihoo 360 Inc.) for reporting these bugs.

CVE-2016-6306

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>

Upstream-Status: Backport
CVE: CVE-2016-6306
Signed-off-by: Armin Kuster <akuster@mvista.com>

---
 ssl/s3_clnt.c | 11 +++++++++++
 ssl/s3_srvr.c |  6 ++++++
 2 files changed, 17 insertions(+)

Index: openssl-1.0.2h/ssl/s3_clnt.c
===================================================================
--- openssl-1.0.2h.orig/ssl/s3_clnt.c
+++ openssl-1.0.2h/ssl/s3_clnt.c
@@ -1216,6 +1216,12 @@ int ssl3_get_server_certificate(SSL *s)
         goto f_err;
     }
     for (nc = 0; nc < llen;) {
+        if (nc + 3 > llen) {
+            al = SSL_AD_DECODE_ERROR;
+            SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
+                   SSL_R_CERT_LENGTH_MISMATCH);
+            goto f_err;
+        }
         n2l3(p, l);
         if ((l + nc + 3) > llen) {
             al = SSL_AD_DECODE_ERROR;
@@ -2167,6 +2173,11 @@ int ssl3_get_certificate_request(SSL *s)
     }
 
     for (nc = 0; nc < llen;) {
+        if (nc + 2 > llen) {
+            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
+            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
+            goto err;
+        }
         n2s(p, l);
         if ((l + nc + 2) > llen) {
             if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
Index: openssl-1.0.2h/ssl/s3_srvr.c
===================================================================
--- openssl-1.0.2h.orig/ssl/s3_srvr.c
+++ openssl-1.0.2h/ssl/s3_srvr.c
@@ -3213,6 +3213,12 @@ int ssl3_get_client_certificate(SSL *s)
         goto f_err;
     }
     for (nc = 0; nc < llen;) {
+        if (nc + 3 > llen) {
+            al = SSL_AD_DECODE_ERROR;
+            SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
+                   SSL_R_CERT_LENGTH_MISMATCH);
+            goto f_err;
+        }
         n2l3(p, l);
         if ((l + nc + 3) > llen) {
             al = SSL_AD_DECODE_ERROR;