alpine 3.6
crypto weakness #64

4

Weakness Breakdown


Definition:

This weakness involves creating non-standard or non-tested algorithms, using weak algorithms or applying cryptographic algorithms incorrectly. Algorithms that were once considered safe are commonly later found to be unsafe, as the algorithms were broken.

Warning code(s):

The crypt functions use a poor one-way hashing algorithm; since they only accept passwords of 8 characters or fewer and only a two-byte salt, they are excessively vulnerable to dictionary attacks given today's faster computing equipment.

File Name:

wpa_supplicant/src/wpa_supplicant-2.6/src/ap/wpa_auth_ft.c

Context:

The highlighted line of code below is the trigger point of this particular Alpine 3.6 crypto weakness.

 			return -1;
	} else {
		wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
			   "packet_type %d", frame->packet_type);
		return -1;
	}

	if (end > pos) {
		wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
			    pos, end - pos);
	}

	return 0;
}


static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
				   struct wpa_ft_pmk_r0_sa *pmk_r0,
				   struct ft_remote_r1kh *r1kh,
				   const u8 *s1kh_id, int pairwise)
{
	struct ft_r0kh_r1kh_push_frame frame, f;
	struct os_time now;
	const u8 *plain;
	u8 *crypt;

	os_memset(&frame, 0, sizeof(frame));
	frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
	frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
	frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
	os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);

	/* aes_wrap() does not support inplace encryption, so use a temporary
	 * buffer for the data. */
	os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
	os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
	os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
	wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
			  s1kh_id, f.pmk_r1, f.pmk_r1_name);
	wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
	wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
		    WPA_PMK_NAME_LEN);
	os_get_time(&now);
	WPA_PUT_LE32(f.timestamp, now.sec);
	f.pairwise = host_to_le16(pairwise);
	os_memset(f.pad, 0, sizeof(f.pad));
	plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
					     timestamp);
	crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame, 

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