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WNM: Ignore Key Data in WNM Sleep Mode Response frame if no PMF in use

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WNM Sleep Mode Response frame is used to update GTK/IGTK only if PMF is
enabled. Verify that PMF is in use before using this field on station
side to avoid accepting unauthenticated key updates. (CVE-2015-5310)

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-10-25 15:45:50 +02:00
parent d0f56772ea
commit 2cb28a4c75
1 changed files with 6 additions and 0 deletions
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6
wpa_supplicant/wnm_sta.c
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@ -189,6 +189,12 @@ static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
end = ptr + key_len_total; end = ptr + key_len_total;
wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total); wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
if (key_len_total && !wpa_sm_pmf_enabled(wpa_s->wpa)) {
wpa_msg(wpa_s, MSG_INFO,
"WNM: Ignore Key Data in WNM-Sleep Mode Response - PMF not enabled");
return;
}
while (end - ptr > 1) { while (end - ptr > 1) {
if (2 + ptr[1] > end - ptr) { if (2 + ptr[1] > end - ptr) {
wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element " wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "