(full article) https://arstechnica.com/information-tec ... esdroppingSevere flaw in WPA2 protocol leaves Wi-Fi traffic open to eavesdropping
ArsTechnica, Dan Goodin - 10/15/2017, 10:37 PM
An air of unease set into the security circles on Sunday as they prepared for the disclosure of high-severity vulnerabilities in the Wi-Fi Protected Access II protocol that make it possible for attackers to eavesdrop Wi-Fi traffic passing between computers and access points.
The proof-of-concept exploit is called KRACK, short for Key Reinstallation Attacks. The research has been a closely guarded secret for weeks ahead of a coordinated disclosure that's scheduled for 8am Monday, East Coast time. A website disclosing the vulnerability said it affects the core WPA2 protocol itself and is effective against devices running the Android, Linux, Apple, Windows, and OpenBSD operating systems, as well as MediaTek Linksys, and other types of devices. The site warned attackers can exploit it to decrypt a wealth of sensitive data that's normally encrypted by the nearly ubiquitous Wi-Fi encryption protocol.
"This can be abused to steal sensitive information such as credit card numbers, passwords, chat messages, emails, photos, and so on. 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."
"Although websites or apps may use HTTPS as an additional layer of protection, we warn that this extra protection can (still) be bypassed in a worrying number of situations," the researchers explained. "For example, HTTPS was previously bypassed in non-browser software, in Apple's iOS and OS X, in Android apps, in Android apps again, in banking apps, and even in VPN apps."
The researchers went on to say that the weakness allows attackers to target both vulnerable access points as well as vulnerable computers, smartphones and other types of clients with differing levels of difficulty... According to a researcher who has been briefed on the vulnerability, it works by exploiting a four-way handshake that's used to establish a key for encrypting traffic. During the third step, the key can be resent multiple times. When it's resent in certain ways, a cryptographic nonce can be reused in a way that completely undermines the encryption.
This is actually a really big deal, and is almost certainly a vulnerability that was designed right in at figurative gunpoint of tyrants and monsters.
