In message <[email protected]>, Cy Schubert
writes:
> Author: cy
> Date: Tue Aug 14 20:10:25 2018
> New Revision: 337818
> URL: https://svnweb.freebsd.org/changeset/base/337818
>
> Log:
> 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 <[email protected]>
>
> Obtained from: git://w1.fi/hostap.git
> MFC after: 1 day
I got ahead of myself here.
Ports and vuxml in progress. git-svn is disk intensive, as is svn for
that matter.
> Security: CVE-2018-14526
> Security: VuXML: 6bedc863-9fbe-11e8-945f-206a8a720317
>
> Modified:
> vendor/wpa/dist/src/rsn_supp/wpa.c
>
> Modified: vendor/wpa/dist/src/rsn_supp/wpa.c
> =============================================================================
> =
> --- vendor/wpa/dist/src/rsn_supp/wpa.c Tue Aug 14 20:02:01 2018
> (r337817)
> +++ vendor/wpa/dist/src/rsn_supp/wpa.c Tue Aug 14 20:10:25 2018
> (r337818)
> @@ -2072,6 +2072,17 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_a
>
> 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 unaut
> henticated data");
> + goto out;
> + }
> if (wpa_supplicant_decrypt_key_data(sm, key, ver, key_data,
> &key_data_len))
> goto out;
--
Cheers,
Cy Schubert <[email protected]>
FreeBSD UNIX: <[email protected]> Web: http://www.FreeBSD.org
The need of the many outweighs the greed of the few.
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