From 3e34cfdff6b192fe337c6fb3f487f73e96582961 Mon Sep 17 00:00:00 2001

From: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>

Date: Sun, 15 Jul 2018 01:25:53 +0200

Subject: [PATCH] WPA: Ignore unauthenticated encrypted EAPOL-Key data

Ignore unauthenticated encrypted EAPOL-Key data in supplicant

processing. When using WPA2, these are frames that have the Encrypted

flag set, but not the MIC flag.

When using WPA2, EAPOL-Key frames that had the Encrypted flag set but

not the MIC flag, had their data field decrypted without first verifying

the MIC. In case the data field was encrypted using RC4 (i.e., when

negotiating TKIP as the pairwise cipher), this meant that

unauthenticated but decrypted data would then be processed. An adversary

could abuse this as a decryption oracle to recover sensitive information

in the data field of EAPOL-Key messages (e.g., the group key).

(CVE-2018-14526)

Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>

---

 src/rsn_supp/wpa.c | 11 +++++++++++

 1 file changed, 11 insertions(+)

diff -upr wpa_supplicant-2.6.orig/src/rsn_supp/wpa.c wpa_supplicant-2.6/src/rsn_supp/wpa.c

--- wpa_supplicant-2.6.orig/src/rsn_supp/wpa.c	2016-10-02 21:51:11.000000000 +0300

+++ wpa_supplicant-2.6/src/rsn_supp/wpa.c	2018-08-08 16:55:11.506831029 +0300

@@ -2016,6 +2016,17 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, c

 	if ((sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) &&

 	    (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {

+		/*

+		 * Only decrypt the Key Data field if the frame's authenticity

+		 * was verified. When using AES-SIV (FILS), the MIC flag is not

+		 * set, so this check should only be performed if mic_len != 0

+		 * which is the case in this code branch.

+		 */

+		if (!(key_info & WPA_KEY_INFO_MIC)) {

+			wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,

+				"WPA: Ignore EAPOL-Key with encrypted but unauthenticated data");

+			goto out;

+		}

 		if (wpa_supplicant_decrypt_key_data(sm, key, ver, key_data,

 						    &key_data_len))

 			goto out;