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This project contains scripts to test if clients or access points (APs) are affected by the KRACK attack against WPA2. For details behind this attack see our website and the research paper.

Remember that our scripts are not attack scripts! You require network credentials in order to test if an access point or client is affected by the attack.

Prerequisites

Our scripts were tested on Kali Linux. To install the required dependencies on Kali, execute:

apt-get update
apt-get install libnl-3-dev libnl-genl-3-dev pkg-config libssl-dev net-tools git sysfsutils python-scapy python-pycryptodome

Then disable hardware encryption using the script ./krackattack/disable-hwcrypto.sh. We tested our scripts on a Kali Linux distribution using a TP-Link WN722N v1.

Remember to disable Wi-Fi in your network manager before using our scripts. After disabling Wi-Fi, execute sudo rfkill unblock wifi so our scripts can still use Wi-Fi.

Testing Clients: detecting a vulnerable 4-way and group key handshake

To simulate an attack against a client follow the detailed instructions in krackattack/krack-test-client.py:

cd krackattack/
./krack-test-client.py --help

Now follow the detail instructions that the script outputs. The script assumes the client will use DHCP to get an IP. Remember to also perform extra tests using the --tptk and --tptk-rand parameters, and using --group to test the group key handshake. So concretely, we recommend running the following tests:

  1. ./krack-test-client.py
  2. ./krack-test-client.py --tptk
  3. ./krack-test-client.py --tptk-rand
  4. ./krack-test-client.py --group

Correspondence to Wi-Fi Alliance tests

The Wi-Fi Alliance created a custom vulnerability detection tool based on our scripts. At the time of writing, this tool is only accessible to Wi-Fi Alliance members. Their tools supports several different tests, and these tests correspond to the functionality in our script as follows:

  • 4.1.1 (Plaintext retransmission of EAPOL Message 3). We currently do not support this test.
  • 4.1.2 (Immediate retransmission of EAPOL M3 in plaintext). We currently do not suppor this test.
  • 4.1.3 (Immediate retransmission of encrypted EAPOL M3 during pairwise rekey handshake). This corresponds to ./krack-test-client.py except that encrypted EAPOL M3 are sent periodically instead of immediately.
  • 4.1.5 (PTK reinstallation in 4-way handshake when STA uses Temporal PTK construction, same ANonce). Execue this test using ./krack-test-client.py --tptk.
  • 4.1.6 (PTK reinstallation in 4-way handshake when STA uses Temporal PTK construction, random ANonce). Execue this test using ./krack-test-client.py --tptk-rand.
  • 4.2.1 (Group key handshake vulnerability test on STA). Execue this test using ./krack-test-client.py --group.
  • 4.3.1 (Reinstallation of GTK and IGTK on STA supporting WNM sleep mode). We currently do not support this test (and neither does the Wi-Fi Alliance).

Testing Access Points: Detecting a vulnerable FT Handshake (802.11r)

The attached Linux script krack-ft-test.py can be used to determine if an AP is vulnerable to our attack. The script contains detailed documentation on how to use it:

cd krackattack/
./krack-ft-test.py --help

Now follow the detail instructions that the script outputs. Essentially, it wraps a normal wpa_supplicant client, and will keep replaying the FT Reassociation Request (making the AP reinstall the PTK).

Extra: Ubuntu 16.04

Our scripts are officially only supported on Kali Linux. Nevertheless, some users have been able to get it running on Ubuntu 16.04. These users remarked that the python-pycryptodome package is not present on Ubuntu, but can be installed as follows:

  1. Install python-pip package
  2. Execute pip install pycryptodomex

They further recommended to install this python module under a virtual python environment using virtualenv.

Extra: Manual Tests

It's also possible to manually perform tests by cloning the hostap git repository:

git clone git://w1.fi/srv/git/hostap.git

And following the instructions in tests/cipher-and-key-mgmt-testing.txt.