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FragAttacks: Fragmentation & Aggregation Attacks
6f234c1e2e
This adds a new hostapd configuration parameter wpa_disable_eapol_key_retries=1 that can be used to disable retransmission of EAPOL-Key frames that are used to install keys (EAPOL-Key message 3/4 and group message 1/2). This is similar to setting wpa_group_update_count=1 and wpa_pairwise_update_count=1, but with no impact to message 1/4 retries and with extended timeout for messages 4/4 and group message 2/2 to avoid causing issues with stations that may use aggressive power saving have very long time in replying to the EAPOL-Key messages. This option can be used to work around key reinstallation attacks on the station (supplicant) side in cases those station devices cannot be updated for some reason. By removing the retransmissions the attacker cannot cause key reinstallation with a delayed frame transmission. This is related to the station side vulnerabilities CVE-2017-13077, CVE-2017-13078, CVE-2017-13079, CVE-2017-13080, and CVE-2017-13081. This workaround might cause interoperability issues and reduced robustness of key negotiation especially in environments with heavy traffic load due to the number of attempts to perform the key exchange is reduced significantly. As such, this workaround is disabled by default (unless overridden in build configuration). To enable this, set the parameter to 1. It is also possible to enable this in the build by default by adding the following to the build configuration: CFLAGS += -DDEFAULT_WPA_DISABLE_EAPOL_KEY_RETRIES=1 Signed-off-by: Jouni Malinen <j@w1.fi> |
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| doc | ||
| eap_example | ||
| hostapd | ||
| hs20 | ||
| mac80211_hwsim/tools | ||
| radius_example | ||
| src | ||
| tests | ||
| wlantest | ||
| wpa_supplicant | ||
| wpadebug | ||
| wpaspy | ||
| .gitignore | ||
| Android.mk | ||
| build_release | ||
| CONTRIBUTIONS | ||
| COPYING | ||
| README | ||
wpa_supplicant and hostapd -------------------------- Copyright (c) 2002-2017, Jouni Malinen <j@w1.fi> and contributors All Rights Reserved. These programs are licensed under the BSD license (the one with advertisement clause removed). If you are submitting changes to the project, please see CONTRIBUTIONS file for more instructions. This package may include either wpa_supplicant, hostapd, or both. See README file respective subdirectories (wpa_supplicant/README or hostapd/README) for more details. Source code files were moved around in v0.6.x releases and compared to earlier releases, the programs are now built by first going to a subdirectory (wpa_supplicant or hostapd) and creating build configuration (.config) and running 'make' there (for Linux/BSD/cygwin builds). License ------- This software may be distributed, used, and modified under the terms of BSD license: Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name(s) of the above-listed copyright holder(s) nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.