sec_connect(char *server, char *username, char *domain, char *password, RD_BOOL reconnect)
{
	uint32 selected_proto;
	struct stream mcs_data;

	/* Start a MCS connect sequence */
	if (!mcs_connect_start(server, username, domain, password, reconnect, &selected_proto))
		return False;

	/* We exchange some RDP data during the MCS-Connect */
	mcs_data.size = 512;
	mcs_data.p = mcs_data.data = (uint8 *) xmalloc(mcs_data.size);
	sec_out_mcs_connect_initial_pdu(&mcs_data, selected_proto);

	/* finalize the MCS connect sequence */
	if (!mcs_connect_finalize(&mcs_data))
		return False;

	/* sec_process_mcs_data(&mcs_data); */
	if (g_encryption)
		sec_establish_key();
	xfree(mcs_data.data);
	return True;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.