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Wi-fi Bug Found In Linux

A bug has been found in a major Linux Wi-Fi driver that can allow an attacker to take control of a laptop -- even when it is not on a Wi-Fi network.

There have not been many Linux Wi-Fi device drivers, and this is apparently the first remotely executable Wi-Fi bug. It affects the widely used MadWi-Fi Linux kernel device driver for Atheros-based Wi-Fi chipsets, according to Laurent Butti, a researcher from France Telecom Orange, who found the flaw and released the information in a presentation at last month's Black Hat conference in Amsterdam.

"You may be vulnerable if you do not manually patch your MadWi-Fi driver," said Butti. Before making it public, he shared the flaw with the MadWi-Fi development team, who have released a patch. However, not all Linux distributions have yet built the patch into their code, said Butti.

The kernel stack-overflow bug lets an attacker run malicious code, and can be used even if the machine is not actively on a Wi-Fi network, according to Butti, who used "fuzzing" techniques which had been shown by David Maynor and "Johnny Cache" Jon Ellch, at last year's Black Hat USA conference, and previously exploited on Windows and Macintosh systems.

Linux users have previously suffered from a shortage of Linux drivers, and have campaigned to get wireless networks supported in the Linux kernel. With fewer Linux laptops on Wi-Fi networks, security experts -- and presumably hackers -- have taken longer to get round to Linux drivers, but issue of handling remote data at the kernel level can cause trouble on the open source OS just as easily as any other.

 

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