The so-called "Aurora" attack exploit on IE 6, which was unleashed in the wild late last week, has raised alarm as researchers demonstrated the exploit code can be retooled to attack IE 7 and IE 8 as well, and can bypass Data Execution Protection (DEP). So far, just a few attacks have actually been spotted in the wild, according to Websense.
George Stathakopoulos, general manager for Trustworthy Computing Security at Microsoft, said in an interview today that Microsoft has seen attacks thus far only on IE 6, and the attacks have been targeted and not widespread. "But we expect that landscape will change as time goes by," Stathakopoulos says. So Microsoft decided to patch the flaw ahead of its next Patch Tuesday in February; the software giant will announce tomorrow exactly when that patch will be available, according to Stathakopoulos.
Though the exploit is just one piece of the puzzle in the attacks out of China, it's what we know for now and can at least try to mitigate, security experts say.
"Ultimately, vulnerabilities happen. They happen to Web browsers -- all of them -- they happen to document readers -- all of them -- and they happen to operating systems and even network infrastructure," says Dan Kaminsky, director of penetration testing for IOActive. "Things will get better over time -- IE 8 on Win7 is pretty solid, and all signs out of Adobe are that Acrobat is really getting worked over. In the meantime, we have to respond to attacks as they come."
So with the exploit code taking on a life of its own and an IE patch on the horizon, how do you protect your organization in the meantime? There's no guarantee your company won't eventually get targeted or hit with this exploit or some variant, but here are some steps Microsoft and other security firms recommend you can take now to help defend yourself:
1. Upgrade to IE 8 if you're an IE shop.
Despite concerns that IE 8 also could be compromised by the attack, Microsoft is still recommending the newest version of its browser as the safest.
Dino Dai Zovi, a security researcher and co-author of The Mac Hacker's Handbook, warns, however, that IE 8 on Windows XP SP3 isn't safe from this exploit, thanks to the latest research findings. "IE 8 on Windows Vista SP1 and above or Windows 7 is considerably more difficult to exploit," he says.
2. Enable DEP in IE.
DEP is automatically enabled in IE 8 on XP SP3, Vista SP1, Vista SP2, and Windows 7, but other versions of the browser require manually selecting DEP.
3. Run IE in Protected Mode on Vista and newer versions of Windows.
Microsoft says doing so limits the "impact" of an attack on the flaw.
4. Warn users about suspicious links that could be used for this attack or Websites containing online ads or user-generated content.
A user has to click on the malicious link to get infected with the malware, so remind people to be careful about links in email and instant messages, and to take care on the Web.
5. Limit user privileges.
If an attacker victimizes a user with administrative rights, then he would have the same access as that user.
6. Set Internet zone security in IE to "high."
7. Update all third-party applications with the latest versions and patches.
"Asking people to use a browser [other] than IE is not going to help one bit, unless the user also patches all other programs," says Thomas Kristensen, CSO at Secunia. "The reason is actually quite obvious -- more than 60 programs are installed on the average PC, approximately one out of five programs on the average PC are vulnerable, [and] some of these programs go unpatched for months, even years."
Meanwhile, security researchers say while the exploit used in the attack wasn't especially sophisticated or unique, it's still a real risk. "I think the ease of this exploit is dangerous," says Lucas Lundgren, a security researcher. "It's another day, another exploit, [but] every enterprise should take these threats seriously."
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