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I argue because UAC is designed to enforce privileges (processes cannot jump to any privilege they want) and control privileges (prompts for privilege changes) it is a security feature. In Microsoft’s defense, some people have also argued UAC is not a “security boundary”, a vague term in my books. Again, the balance between usability and security comes under the spotlight. This will make sure granting privileges are only in the control of your own mouse clicks and should prevent a malicious application from exploiting this and the previous flaw. Important: The advice to every Windows 7 beta user is to set your UAC setting to “high”. The only solution I can think of is also one I don’t think Microsoft will even consider, that is to revert to a single UAC policy and prompt for every elevation including Windows’ own applications. The breadth of Windows executables is just too many and too diverse, and many are exploitable. Unfortunately this flaw is not just a single point of failure.

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With a simple “proxy” executable that does nothing more than launch an elevated instance of “RUNDL元2” pointing to a malicious payload DLL, the code inside that DLL now inherits the administrative privileges from its parent process “RUNDL元2” without ever prompting for UAC or turning it off.įor more technical details about this and a downloadable proof of concept, head over to Rafael’s site where he has prepared a non-malicious informational executable and DLL rolled into one neat package to try for yourself at home. To demonstrate, one of the many Microsoft-signed applications that can be taken advantage of is “RUNDL元2.exe”. A phenomenon I’ve started calling “piggybacking”. Since there is an inherent trust on everything Microsoft-signed, by design, the chain of trust inadvertently flows onto other third-party code as well. A handful of these Microsoft-signed applications can also execute third-party code for various legitimate purposes. The fundamental risk with the above behavior is the fact that Windows is a platform that welcomes third-party code with open arms. Rafael Rivera has more details how this works. Without going into too much detail, as you already may know from the previous postings, Windows 7 has the ability automatically elevates Microsoft-signed applications and code which specifies “auto elevation” to mitigate the number of UAC prompts.

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If and until a patch is available, I feel obliged to outline the elevated risk (pun) to the millions of Windows 7 beta user running Windows 7 beta in its default UAC policy of “notify me of changes by program, not of Windows changes” which does not adequately enforce the privilege system, arguably an essential factor to a safe operating system. Whilst Microsoft has not officially responded, I’ve heard rumors it may already fixed in current internal builds. This public disclosure comes after a private disclosure to Microsoft and Windows 7 beta testers earlier this week. A result I’m sure cannot be classified as “by design”.

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In summary, a second UAC security flaw in the Windows 7 beta’s default security configuration allows a malicious application to autonomously elevate themselves to full administrative privileges without UAC prompts or turning UAC off. Soon after writing my last blog post on the potential security vulnerability to autonomously disable Windows 7 beta’s UAC system, I had realized that flaw was just one piece in a string of dominoes that fell much earlier when the new tiered-UAC system was introduced in Windows 7.

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