Adds multiple checks to avoid buffer over reads
@@ -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);
