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Fix validation of EAPOL-Key length with AES key wrap (CID 62859)

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The additional eight octet field was removed from keydatalen without
proper validation of the Key Data Length field. It would have been
possible for an invalid EAPOL-Key frame to be processed in a way that
ends up reading beyond the buffer. In theory, this could have also
resulted in writing beyond the EAPOL-Key frame buffer, but that is
unlikely to be feasible due to the AES key wrap validation step on
arbitrary memory contents.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-06-14 00:20:04 +03:00
parent 6590b6400f
commit b7c61c9d4e
1 changed files with 1 additions and 1 deletions
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src/rsn_supp/wpa.c
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@ -1501,7 +1501,7 @@ static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
ver == WPA_KEY_INFO_TYPE_AES_128_CMAC || ver == WPA_KEY_INFO_TYPE_AES_128_CMAC ||
sm->key_mgmt == WPA_KEY_MGMT_OSEN) { sm->key_mgmt == WPA_KEY_MGMT_OSEN) {
u8 *buf; u8 *buf;
if (keydatalen % 8) { if (keydatalen < 8 || keydatalen % 8) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported AES-WRAP len %d", "WPA: Unsupported AES-WRAP len %d",
keydatalen); keydatalen);