In my last blog post I introduced the new Windows feature, Administrator Protection and how it aimed to create a secure boundary for UAC where one didn’t exist. I described one of the ways I was able to bypass the feature before it was released. In total I found 9 bypasses during my research that have now all been fixed. In this blog post I wanted to describe the root cause of 5 of those 9 issues, specifically the implementation of UI Access, how this has been a long standing problem with UAC that’s been under-appreciated, and how it’s being fixed now. A Question of Accessibility Prior to Windows Vista any process running on a user’s desktop could control any window created by another, such as by sending window messages. This behavior could be abused if a privileged user, such as SYSTEM, displayed a user interface on the desktop. A limited user could control the UI and potentially elevate privileges. This was referred to as a Shatter Attack, and was usually fixed by removing user interface components from privileged code.
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Bypassing Administrator Protection by Abusing UI Access
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This intelligence summary is sourced from Google Project Zero and curated by CyberHawk Threat Intel for the security community. Read the complete article at the source link.
Read original at Google Project Zero →
This intelligence summary is sourced from Google Project Zero and curated by CyberHawk Threat Intel for the security community. Read the complete article at the source link.
Read original at Google Project Zero →
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