From 796e4197f696261c1f872d7576371232330bcc30 Mon Sep 17 00:00:00 2001
From: Simon Josefsson <simon@josefsson.org>
Date: Fri, 15 Jul 2022 16:23:58 +0200
Subject: [PATCH] GSSAPI server: Boundary check gss_wrap token (read OOB).

--- gsasl-1.8.0.orig/gssapi/server.c
+++ gsasl-1.8.0/gssapi/server.c
@@ -232,6 +232,9 @@ _gsasl_gssapi_server_step (Gsasl_session
          FALSE, and responds with the generated output_message.  The
          client can then consider the server authenticated. */
 
+      if (bufdesc2.length < 4)
+	return GSASL_AUTHENTICATION_ERROR;
+
       if ((((char *) bufdesc2.value)[0] & GSASL_QOP_AUTH) == 0)
 	{
 	  /* Integrity or privacy unsupported */