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We show that low-layer attacks against Wi-Fi can be implemented using user-modifiable firmware. Hence cheap off-the-shelf Wi-Fi dongles can be used carry out advanced attacks. We demonstrate this by implementing five low-layer attacks using open source Atheros firmware. The first attack consists of unfair channel usage, giving the user a higher throughput while reducing that of others. The second attack defeats countermeasures designed to prevent unfair channel usage. The third attack performs continuous jamming, making the channel unusable for other devices. For the fourth attack we implemented a selective jammer, allowing one to jam specific frames already in the air. The fifth is a novel channel-based Man-in-the-Middle (MitM) attack, enabling reliable manipulation of encrypted traffic.
Vanhoef et al. (Mon,) studied this question.
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