1 files changed, 48 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/wpa-supplicant/wpa-supplicant/0012-EAP-pwd-server-Detect-reflection-attacks.patch b/meta/recipes-connectivity/wpa-supplicant/wpa-supplicant/0012-EAP-pwd-server-Detect-reflection-attacks.patch
new file mode 100644
index 0000000000..32d134db41
--- /dev/null
+++ b/meta/recipes-connectivity/wpa-supplicant/wpa-supplicant/0012-EAP-pwd-server-Detect-reflection-attacks.patch
@@ -0,0 +1,48 @@
+From d63edfa90243e9a7de6ae5c275032f2cc79fef95 Mon Sep 17 00:00:00 2001
+From: Mathy Vanhoef <mathy.vanhoef@nyu.edu>
+Date: Sun, 31 Mar 2019 17:26:01 +0200
+Subject: [PATCH 12/14] EAP-pwd server: Detect reflection attacks
+
+When processing an EAP-pwd Commit frame, verify that the peer's scalar
+and elliptic curve element differ from the one sent by the server. This
+prevents reflection attacks where the adversary reflects the scalar and
+element sent by the server. (CVE-2019-9497)
+
+The vulnerability allows an adversary to complete the EAP-pwd handshake
+as any user. However, the adversary does not learn the negotiated
+session key, meaning the subsequent 4-way handshake would fail. As a
+result, this cannot be abused to bypass authentication unless EAP-pwd is
+used in non-WLAN cases without any following key exchange that would
+require the attacker to learn the MSK.
+
+Signed-off-by: Mathy Vanhoef <mathy.vanhoef@nyu.edu>
+Signed-off-by: Adrian Bunk <bunk@stusta.de>
+Upstream-Status: Backport
+CVE: CVE-2019-9497
+---
+ src/eap_server/eap_server_pwd.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/src/eap_server/eap_server_pwd.c b/src/eap_server/eap_server_pwd.c
+index 74979da..16057e9 100644
+--- a/src/eap_server/eap_server_pwd.c
++++ b/src/eap_server/eap_server_pwd.c
+@@ -753,6 +753,15 @@ eap_pwd_process_commit_resp(struct eap_sm *sm, struct eap_pwd_data *data,
+                }
+        }
+ 
++       /* detect reflection attacks */
++       if (crypto_bignum_cmp(data->my_scalar, data->peer_scalar) == 0 ||
++           crypto_ec_point_cmp(data->grp->group, data->my_element,
++                               data->peer_element) == 0) {
++               wpa_printf(MSG_INFO,
++                          "EAP-PWD (server): detected reflection attack!");
++               goto fin;
++       }
++
+        /* compute the shared key, k */
+        if ((crypto_ec_point_mul(data->grp->group, data->grp->pwe,
+                                 data->peer_scalar, K) < 0) ||
+-- 
+2.7.4
+