[openssl-commits] [openssl] master update

[bernd.edlinger at hotmail.de]

The branch master has been updated
       via  161ff6c5fa872ba77be22d2093920cf505534508 (commit)
      from  dead788f6ece66707e4d0eb4bd446bdec64dae4e (commit)


- Log -----------------------------------------------------------------
commit 161ff6c5fa872ba77be22d2093920cf505534508
Author: Philippe Antoine <p.antoine at catenacyber.fr>
Date:   Fri Mar 23 20:51:38 2018 +0100

    Adds multiple checks to avoid buffer over reads
    
    Reviewed-by: Rich Salz <rsalz at openssl.org>
    Reviewed-by: Andy Polyakov <appro at openssl.org>
    Reviewed-by: Bernd Edlinger <bernd.edlinger at hotmail.de>
    (Merged from https://github.com/openssl/openssl/pull/5675)

-----------------------------------------------------------------------

Summary of changes:
 ssl/t1_trce.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/ssl/t1_trce.c b/ssl/t1_trce.c
index f8d0501..f888d24 100644
--- a/ssl/t1_trce.c
+++ b/ssl/t1_trce.c
@@ -888,6 +888,8 @@ static int ssl_print_extensions(BIO *bio, int indent, int server,
         BIO_puts(bio, "No Extensions\n");
         return 1;
     }
+    if (msglen < 2)
+        return 0;
     extslen = (msg[0] << 8) | msg[1];
     if (extslen != msglen - 2)
         return 0;
@@ -1293,6 +1295,8 @@ static int ssl_print_cert_request(BIO *bio, int indent, const SSL *ssl,
         msg += xlen;
     }
 
+    if (msglen < 2)
+        return 0;
     xlen = (msg[0] << 8) | msg[1];
     BIO_indent(bio, indent, 80);
     if (msglen < xlen + 2)
@@ -1493,7 +1497,15 @@ void SSL_trace(int write_p, int version, int content_type,
     switch (content_type) {
     case SSL3_RT_HEADER:
         {
-            int hvers = msg[1] << 8 | msg[2];
+            int hvers;
+
+            /* avoid overlapping with length at the end of buffer */
+            if (msglen < (SSL_IS_DTLS(ssl) ? 13 : 5)) {
+                BIO_puts(bio, write_p ? "Sent" : "Received");
+                ssl_print_hex(bio, 0, " too short message", msg, msglen);
+                break;
+            }
+            hvers = msg[1] << 8 | msg[2];
             BIO_puts(bio, write_p ? "Sent" : "Received");
             BIO_printf(bio, " Record\nHeader:\n  Version = %s (0x%x)\n",
                        ssl_trace_str(hvers, ssl_version_tbl), hvers);