From 749fbab0bb4bad3748d164f8c25485618f0ed1ce Mon Sep 17 00:00:00 2001 From: Fabrice Fontaine Date: Mon, 30 Mar 2020 23:54:25 +0200 Subject: [PATCH] package/hostapd: fix CVE-2019-16275 hostapd before 2.10 and wpa_supplicant before 2.10 allow an incorrect indication of disconnection in certain situations because source address validation is mishandled. This is a denial of service that should have been prevented by PMF (aka management frame protection). The attacker must send a crafted 802.11 frame from a location that is within the 802.11 communications range. Signed-off-by: Fabrice Fontaine Signed-off-by: Peter Korsgaard --- ...re-management-frame-from-unexpected-.patch | 77 +++++++++++++++++++ package/hostapd/hostapd.mk | 4 + 2 files changed, 81 insertions(+) create mode 100644 package/hostapd/0001-AP-Silently-ignore-management-frame-from-unexpected-.patch diff --git a/package/hostapd/0001-AP-Silently-ignore-management-frame-from-unexpected-.patch b/package/hostapd/0001-AP-Silently-ignore-management-frame-from-unexpected-.patch new file mode 100644 index 0000000000..959788c2e9 --- /dev/null +++ b/package/hostapd/0001-AP-Silently-ignore-management-frame-from-unexpected-.patch @@ -0,0 +1,77 @@ +From 8c07fa9eda13e835f3f968b2e1c9a8be3a851ff9 Mon Sep 17 00:00:00 2001 +From: Jouni Malinen +Date: Thu, 29 Aug 2019 11:52:04 +0300 +Subject: [PATCH] AP: Silently ignore management frame from unexpected source + address + +Do not process any received Management frames with unexpected/invalid SA +so that we do not add any state for unexpected STA addresses or end up +sending out frames to unexpected destination. This prevents unexpected +sequences where an unprotected frame might end up causing the AP to send +out a response to another device and that other device processing the +unexpected response. + +In particular, this prevents some potential denial of service cases +where the unexpected response frame from the AP might result in a +connected station dropping its association. + +Signed-off-by: Jouni Malinen + +Signed-off-by: Fabrice Fontaine +[Retrieved from: +https://w1.fi/security/2019-7/0001-AP-Silently-ignore-management-frame-from-unexpected-.patch] +--- + src/ap/drv_callbacks.c | 13 +++++++++++++ + src/ap/ieee802_11.c | 12 ++++++++++++ + 2 files changed, 25 insertions(+) + +diff --git a/src/ap/drv_callbacks.c b/src/ap/drv_callbacks.c +index 31587685fe3b..34ca379edc3d 100644 +--- a/src/ap/drv_callbacks.c ++++ b/src/ap/drv_callbacks.c +@@ -131,6 +131,19 @@ int hostapd_notif_assoc(struct hostapd_data *hapd, const u8 *addr, + "hostapd_notif_assoc: Skip event with no address"); + return -1; + } ++ ++ if (is_multicast_ether_addr(addr) || ++ is_zero_ether_addr(addr) || ++ os_memcmp(addr, hapd->own_addr, ETH_ALEN) == 0) { ++ /* Do not process any frames with unexpected/invalid SA so that ++ * we do not add any state for unexpected STA addresses or end ++ * up sending out frames to unexpected destination. */ ++ wpa_printf(MSG_DEBUG, "%s: Invalid SA=" MACSTR ++ " in received indication - ignore this indication silently", ++ __func__, MAC2STR(addr)); ++ return 0; ++ } ++ + random_add_randomness(addr, ETH_ALEN); + + hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211, +diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c +index c85a28db44b7..e7065372e158 100644 +--- a/src/ap/ieee802_11.c ++++ b/src/ap/ieee802_11.c +@@ -4626,6 +4626,18 @@ int ieee802_11_mgmt(struct hostapd_data *hapd, const u8 *buf, size_t len, + fc = le_to_host16(mgmt->frame_control); + stype = WLAN_FC_GET_STYPE(fc); + ++ if (is_multicast_ether_addr(mgmt->sa) || ++ is_zero_ether_addr(mgmt->sa) || ++ os_memcmp(mgmt->sa, hapd->own_addr, ETH_ALEN) == 0) { ++ /* Do not process any frames with unexpected/invalid SA so that ++ * we do not add any state for unexpected STA addresses or end ++ * up sending out frames to unexpected destination. */ ++ wpa_printf(MSG_DEBUG, "MGMT: Invalid SA=" MACSTR ++ " in received frame - ignore this frame silently", ++ MAC2STR(mgmt->sa)); ++ return 0; ++ } ++ + if (stype == WLAN_FC_STYPE_BEACON) { + handle_beacon(hapd, mgmt, len, fi); + return 1; +-- +2.20.1 + diff --git a/package/hostapd/hostapd.mk b/package/hostapd/hostapd.mk index f8c144c236..b94a0e4578 100644 --- a/package/hostapd/hostapd.mk +++ b/package/hostapd/hostapd.mk @@ -12,6 +12,10 @@ HOSTAPD_DEPENDENCIES = host-pkgconf HOSTAPD_CFLAGS = $(TARGET_CFLAGS) HOSTAPD_LICENSE = BSD-3-Clause HOSTAPD_LICENSE_FILES = README + +# 0001-AP-Silently-ignore-management-frame-from-unexpected-.patch +HOSTAPD_IGNORE_CVES += CVE-2019-16275 + HOSTAPD_CONFIG_SET = HOSTAPD_CONFIG_ENABLE = \ -- 2.30.2