Hack contest's QuickTime bug puts all browsers at risk

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Because the flaw is in QuickTime's code the attack surface is "huge", says TippingPoint

By Gregg Keizer | Framingham | Friday, 27 April, 2007

The QuickTime vulnerability that first surfaced last Friday in a Mac hack challenge is "very serious" and can be exploited through any Java-enabled browser, including Internet Explorer 7 running on both Windows XP and Vista, says the company that laid out the contest's US$10,000 prize.

Unconfirmed reports also claimed that someone may have captured the exploit on Friday as the MacBook Pro was attacked. If that turns out to be the case, a widespread attack would be more likely.

Although the bug was first ascribed to Apple's Safari web browser, by Monday researchers at 3com TippingPoint — which put up the prize money as part of its Zero Day Initiative bug bounty programme — had confirmed the vulnerability was in QuickTime, Apple's media player.

Because the flaw is in QuickTime's code, and because QuickTime plug-ins are commonly installed on both Macs and PCs, and in not only Safari, but also Mozilla's Firefox and Microsoft's Internet Explorer (IE), the attack surface is "huge," says Terri Forslof, TippingPoint's manager of security research.

"This is every bit as dangerous as any vulnerability we see out there," says Forslof, who confirmed this week that using IE 6 and IE 7 on Windows XP SP2, as well as IE 7 on Vista, could lead to an exploit. "If Microsoft was rating this, it would [rate it as] a critical vulnerability. One click and you're owned."

"The vulnerability is in QuickTime, but any Java-enabled browser can be an exploit vector. No exclusions," says Forslof. TippingPoint confirmed this morning that IE 7 running on Vista — the browser that Microsoft touts as its most secure — could be a route to a PC hijack.

A successful exploit would require that the user be tricked into visiting a website containing malicious Java code. That kind of attack is commonplace, with links typically delivered via spammed email. Until Apple patches QuickTime, the only sure defense, says Forslof, is to disable Java in the browser.

Late this morning, researchers at Matasano Security, the New York-based consultancy where the MacBook contest winner, Dino Di Zovie, once worked, says it had unconfirmed reports from credible sources that the exploit had been snatched out of the air at the CanSecWest conference.

The MacBooks left open to attack during the CanSecWest challenge were connected to an unprotected wireless network, says Matasano's Thomas Ptacek in a blog this morning. "Raw packet captures of the successful exploit have been taken by parties unknown," he says. "There's a difference between the exploit being captured and the exploit being successfully hosted by attackers in the wild....[but] even so, this is a particularly virulent problem."

Adding fodder to those reports, a writer on the Information Security Sell Out blog claimed to have not only captured all data packets transmitted during the hacking contest, but had reverse-engineered the vulnerability.

Ptacek of Matasano, however, was dubious. "Their claims aren't corroborated by any of the public record about the vulnerability, which, contrary to their report, doesn't appear to involve 'the way QuickTime handles Javascript'."

Forslof would neither confirm nor deny the reports of the exploit — for which it paid Di Zovie the US$10,000 — escaping into the wild. "We're keeping the details of the vulnerability close to the chest," she says, "but QuickTime is pretty ubiquitous. With so much press around the actual challenge and so many people interested in it, an exploit is just a matter of time."

Although Forslof says that her team reported the QuickTime vulnerability to Apple on Monday, the Cupertino, Calif. computer maker has refused to comment on the specifics of the bug. Company spokesman Anuj Nayar would only repeat the standard Apple statement issued when security questions are asked: "Apple takes security very seriously and has an excellent track record of addressing potential vulnerabilities. We always welcome feedback on how to improve security."