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Mac hacker publishes Airport exploit

Notorious Wi-Fi hack finally published

Notorious Mac hacker David Maynor has finally published details of an exploit for Apple's Airport wireless drivers, more than a year after claiming to have found a way to take over a Mac computer using the flaw.

The details were included in a paper published in the September issue of Uninformed.org, an online hacking magazine. The lengthy paper describes how to run unauthorised software on a Mac by taking advantage of a flaw in Apple's AirPort wireless drivers.

Apple patched the bug on September 21, 2006, without crediting Maynor for discovering the problem. Instead, Apple's engineers found the bug during an internal audit, the company said.

Maynor and researcher Jon Ellch first described this type of problem during an August 2006 presentation at the Black Hat security conference in Las Vegas. He was widely criticised by the Apple community for failing to back up his claims with technical details, and for presenting a video demonstration that used a third-party wireless card instead of the one that ships with the Mac.

On Tuesday, Maynor said that at the time of the Black Hat demonstration, he had found similar wireless bugs in a number of wireless cards, including Apple's AirPort and that he had been told to use the third-party card in the video because it was deemed "the least offensive to people."

So why publish the Mac hack now?

Maynor said that he had been under a nondisclosure agreement, which had previously prevented him from publishing details of the hack. The security researcher wouldn't say who his NDA was with, but that agreement is no longer in force, allowing him to talk about the exploit. "I published it now because I can publish it now," he said.

By going public with the information, Maynor hopes to help other Apple researchers with new documentation on things like Wi-Fi debugging and the Mac OS X kernel core dumping facility. "There's a lot of interesting information in the paper that, if you're doing vulnerability research on Apple, you'd find useful."

Maynor will soon publish a second paper on Uniformed.org explaining how to write software that will run on a compromised system, he said.

As for his detractors, who will say that this disclosure comes too late, Maynor says he just doesn't care what they think. "Let them tear me apart all they want but at the end of the day the technical merit of the paper will stand on its own."


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