Disallow Message sequence number 2 in DTLSv1_listen

Signed-off-by: Joshua Rogers <MegaManSec@users.noreply.github.com>
Reviewed-by: Frederik Wedel-Heinen <fwh.openssl@gmail.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28788)

(cherry picked from commit dc242b16954552c7589a6c2ea829c2a888878f27)

diff --git a/ssl/d1_lib.c b/ssl/d1_lib.c
index 29b6b04467fdf5db61191277b8a502405a3126d7..d10814bc76d711682db5cd2319eca94b17c9b8f7 100644 (file)
--- a/ssl/d1_lib.c
+++ b/ssl/d1_lib.c
@@ -571,7 +571,7 @@ int DTLSv1_listen(SSL *ssl, BIO_ADDR *client)
         }
 
         /* Message sequence number can only be 0 or 1 */
-        if (msgseq > 2) {
+        if (msgseq > 1) {
             ERR_raise(ERR_LIB_SSL, SSL_R_INVALID_SEQUENCE_NUMBER);
             goto end;
         }