This particular technique can be remediated or fixed by setting the UAC level to "Always Notify" or by removing the current user from the Local Administrators group. However, he also warns that the exploit is different to others that are publicly known for a number of reasons:. All Rights Reserved. Privacy Policy - Cookie Policy. Got News? Contact Us. How to transform the role of a CISO for the digital-first economy.
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If you look at the targets of this exploit, you will find that Windows 7 is vulnerable even though Windows Vista which came before Windows 7 is not vulnerable. The reason for this is because Microsoft deliberately downplayed the security of Windows 7 in order to provider a better user experience.
Any Vista user is going to tell you the unlimited number of UAC prompts every time they performed a task. To minimize those prompts, Microsoft decided that all those applications that Microsoft signs with its code signing certificate should be trusted for auto elevation of privileges and so this vulnerability was born. Since the sysprep. This technique is known as DLL hijacking. Suppose the malicious DLL starts notepad.
This vulnerability also exist in Windows 8 although not with the sysprep. Now if you are concerned about this attack vector there are a few steps you can take to make sure bypass UAC don't work. The first thing you can do is not to use Administrator user. This will protect you because injecting a malicious DLL or any other code in another process require to have debug privilege on that process.
Administrators can have debug privilege to any process that is why bypass UAC require Administrator privileges. If you set the protection to Always Notify , no process can silently elevate its privileges.
Now you decide whether you should worry about this vulnerability or not. In most of the cases, if the malicious user has gained code execution with Administrator privileges, its already game over for you. Should you worry about it? It depends on what you're doing about it, if you're using the administrator account then yea you should, but if you have the administrator locked with a nice password and you're using a second account then what's to worry about?
This is a local exploit. It means someone must already have access to your computer to use it. For a home user this is not a problem on it's own. The same rules for securing your computer still apply: for example don't run. UAC is not a security boundary, and as such shouldn't be used as a real protective measure. It's nice to have and a neat idea, but it doesn't protect you.
Sure, why not? A bug is a bug. If you're actually looking to provide real protection then don't run things where UAC has to act -- run as a standard user. Any attack that can bypass UAC would have nothing to bypass and will only get privileges of the standard user, not an administrator. Sign up to join this community. The best answers are voted up and rise to the top.
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