"It's actually scary how accurate it is," said Kamkar, the author of the Samy Worm, a self-replicating XSS exploit that in 2005 added more than 1 million friends to his MySpace account and in the process knocked the site out of commission. "I've found that with a single MAC address, I've always been spot on with the tests I've done."
Kamkar, who tweeted about the vulnerability Tuesday, has posted a proof-of-concept attack here. For now, it works only on FiOS routers supplied by Verizon, and then only when users are logged in to the device's administrative panel. With a little more work, he said he can make it exploit similar XSS holes in routers made by other manufacturers.
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