diff options
Diffstat (limited to 'main/wpa_supplicant/0001-EAP-pwd-peer-Fix-payload-length-validation-for-Commi.patch')
| -rw-r--r-- | main/wpa_supplicant/0001-EAP-pwd-peer-Fix-payload-length-validation-for-Commi.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/main/wpa_supplicant/0001-EAP-pwd-peer-Fix-payload-length-validation-for-Commi.patch b/main/wpa_supplicant/0001-EAP-pwd-peer-Fix-payload-length-validation-for-Commi.patch new file mode 100644 index 000000000..91627fb7b --- /dev/null +++ b/main/wpa_supplicant/0001-EAP-pwd-peer-Fix-payload-length-validation-for-Commi.patch @@ -0,0 +1,73 @@ +From dd2f043c9c43d156494e33d7ce22db96e6ef42c7 Mon Sep 17 00:00:00 2001 +From: Jouni Malinen <j@w1.fi> +Date: Fri, 1 May 2015 16:37:45 +0300 +Subject: [PATCH 1/5] EAP-pwd peer: 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_peer/eap_pwd.c | 29 +++++++++++++++++++++++++++++ + 1 file changed, 29 insertions(+) + +diff --git a/src/eap_peer/eap_pwd.c b/src/eap_peer/eap_pwd.c +index f2b0926..a629437 100644 +--- a/src/eap_peer/eap_pwd.c ++++ b/src/eap_peer/eap_pwd.c +@@ -355,6 +355,23 @@ eap_pwd_perform_commit_exchange(struct eap_sm *sm, struct eap_pwd_data *data, + BIGNUM *mask = NULL, *x = NULL, *y = NULL, *cofactor = NULL; + u16 offset; + u8 *ptr, *scalar = NULL, *element = NULL; ++ size_t prime_len, order_len; ++ ++ if (data->state != PWD_Commit_Req) { ++ ret->ignore = TRUE; ++ goto fin; ++ } ++ ++ 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->private_value = BN_new()) == NULL) || + ((data->my_element = EC_POINT_new(data->grp->group)) == NULL) || +@@ -554,6 +571,18 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data, + u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr; + int offset; + ++ if (data->state != PWD_Confirm_Req) { ++ ret->ignore = TRUE; ++ goto fin; ++ } ++ ++ 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; ++ } ++ + /* + * first build up the ciphersuite which is group | random_function | + * prf +-- +1.9.1 + |