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"11 May 2021 — This website presents FragAttacks (fragmentation and aggregation attacks) which is a collection of new security vulnerabilities that affect Wi-Fi devices. An adversary that is within range of a victim's Wi-Fi network can abuse these vulnerabilities to steal user information or attack devices. Three of the discovered vulnerabilities are design flaws in the Wi-Fi standard and therefore affect most devices. On top of this, several other vulnerabilities were discovered that are caused by widespread programming mistakes in Wi-Fi products. Experiments indicate that every Wi-Fi product is affected by at least one vulnerability and that most products are affected by several vulnerabilities."

"The discovered vulnerabilities affect all modern security protocols of Wi-Fi, including the latest WPA3 specification. Even the original security protocol of Wi-Fi, called WEP, is affected. This means that several of the newly discovered design flaws have been part of Wi-Fi since its release in 1997! Fortunately, the design flaws are hard to abuse because doing so requires user interaction or is only possible when using uncommon network settings. As a result, in practice the biggest concern are the programming mistakes in Wi-Fi products since several of them are trivial to exploit."

"The discovery of these vulnerabilities comes as a surprise, because the security of Wi-Fi has in fact significantly improved over the past years. For instance, previously we discovered the KRACK attacks, the defenses against KRACK were proven secure, and the latest WPA3 security specification has improved. Unfortunately, a feature that could have prevented one of the newly discovered design flaws was not adopted in practice, and the other two design flaws are present in a feature of Wi-Fi that was previously not widely studied. This shows it stays important to analyze even the most well-known security protocols (if you want to help, we are hiring). Additionally, it shows that it's essential to regularly test Wi-Fi products for security vulnerabilities, which can for instance be done when certifying them."

"To protect users, security updates were prepared during a 9-month-long coordinated disclosure that was supervised by the Wi-Fi Alliance and ICASI. If updates for your device are not yet available, you can mitigate some attacks (but not all) by assuring that websites use HTTPS and by assuring that your devices received all other available updates."

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Introduction

Demo

Details

Paper

Tools

Q&A