File 0002-EAP-pwd-server-Fix-payload-length-validati... of Package wpa_supplicant

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File 0002-EAP-pwd-server-Fix-payload-length-validation-for-Com.patch of Package wpa_supplicant

From e28a58be26184c2a23f80b410e0997ef1bd5d578 Mon Sep 17 00:00:00 2001
From: Jouni Malinen <j@w1.fi>
Date: Fri, 1 May 2015 16:40:44 +0300
Subject: [PATCH 2/5] EAP-pwd server: Fix payload length validation for Commit
 and Confirm

The length of the received Commit and Confirm message payloads was not
checked before reading them. This could result in a buffer read
overflow when processing an invalid message.

Fix this by verifying that the payload is of expected length before
processing it. In addition, enforce correct state transition sequence to
make sure there is no unexpected behavior if receiving a Commit/Confirm
message before the previous exchanges have been completed.

Thanks to Kostya Kortchinsky of Google security team for discovering and
reporting this issue.

Signed-off-by: Jouni Malinen <j@w1.fi>
---
 src/eap_server/eap_server_pwd.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/eap_server/eap_server_pwd.c b/src/eap_server/eap_server_pwd.c
index 66bd5d2..3189105 100644
--- a/src/eap_server/eap_server_pwd.c
+++ b/src/eap_server/eap_server_pwd.c
@@ -656,9 +656,21 @@ eap_pwd_process_commit_resp(struct eap_sm *sm, struct eap_pwd_data *data,
 	BIGNUM *x = NULL, *y = NULL, *cofactor = NULL;
 	EC_POINT *K = NULL, *point = NULL;
 	int res = 0;
+	size_t prime_len, order_len;
 
 	wpa_printf(MSG_DEBUG, "EAP-pwd: Received commit response");
 
+	prime_len = BN_num_bytes(data->grp->prime);
+	order_len = BN_num_bytes(data->grp->order);
+
+	if (payload_len != 2 * prime_len + order_len) {
+		wpa_printf(MSG_INFO,
+			   "EAP-pwd: Unexpected Commit payload length %u (expected %u)",
+			   (unsigned int) payload_len,
+			   (unsigned int) (2 * prime_len + order_len));
+		goto fin;
+	}
+
 	if (((data->peer_scalar = BN_new()) == NULL) ||
 	    ((data->k = BN_new()) == NULL) ||
 	    ((cofactor = BN_new()) == NULL) ||
@@ -774,6 +786,13 @@ eap_pwd_process_confirm_resp(struct eap_sm *sm, struct eap_pwd_data *data,
 	u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr;
 	int offset;
 
+	if (payload_len != SHA256_MAC_LEN) {
+		wpa_printf(MSG_INFO,
+			   "EAP-pwd: Unexpected Confirm payload length %u (expected %u)",
+			   (unsigned int) payload_len, SHA256_MAC_LEN);
+		goto fin;
+	}
+
 	/* build up the ciphersuite: group | random_function | prf */
 	grp = htons(data->group_num);
 	ptr = (u8 *) &cs;
-- 
1.9.1

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