On Sunday, 15.10.2017, a Wi-Fi security research results were published. This is reported by the Ars Technica.
The research is called KRACK (Key Reinstallation Attacks). The research has been a big secret for weeks ahead of a coordinated disclosure that is scheduled for 8 a.m. Monday, east coast time. US CERT described the KRACK:
US-CERT has become aware of several key management vulnerabilities in the 4-way handshake of the Wi-Fi Protected Access II (WPA2) security protocol. The impact of exploiting these vulnerabilities includes decryption, packet replay, TCP connection hijacking, HTTP content injection, and others. Note that as protocol-level issues, most or all correct implementations of the standard will be affected. The CERT/CC and the reporting researcher KU Leuven, will be publicly disclosing these vulnerabilities on 16 October 2017.
US CERT team
What had researchers found?
According to official website of KRACK, they've discovered serious weaknesses in WPA2, a protocol that secures all modern protected Wi-Fi networks. An attacker within range of a victim can exploit these weaknesses using key reinstallation attacks (KRACKs). The attack works against all modern protected Wi-Fi networks. Depending on the network configuration, it is also possible to inject and manipulate data. For example, an attacker might be able to inject ransomware or other malware into websites. The weaknesses are in the Wi-Fi standard itself, and not in individual products or implementations. Therefore, any correct implementation of WPA2 is likely affected.
Researchers says that if your device supports Wi-Fi, it is most likely affected. They've discovered that:
- and others.
are in danger.
As a proof-of-concept team executed a key reinstallation attack against an Android smartphone. In this demonstration, the attacker is able to decrypt all data that the victim transmits. For an attacker this is easy to accomplish, because our key reinstallation attack is exceptionally devastating against Linux and Android 6.0 or higher.
KRACK team also released big FAQ list. We are publishing the most interesting.
- Do we now need WPA3?
- No, luckily implementations can be patched in a backwards-compatible manner. This means a patched client can still communicate with an unpatched access point, and vice versa.
- Should I change my Wi-Fi password?
- Changing the password of your Wi-Fi network does not prevent (or mitigate) the attack.
- Is my device vulnerable?
- Probably. Any device that uses Wi-Fi is likely vulnerable. Contact your vendor for more information.
- Should I temporarily use WEP until my devices are patched?
- NO! Keep using WPA2.
Learn more at KRACK official website.