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UAC stands for User Account Control, and it was introduced in Windows Vista.
UAC is the gate keeper to prevent unauthorized attempts that involve high privileges. When an installation occurs or a change in system settings that require administrator privileges, the UAC window is being prompted, and a user interaction is required in order to proceed with the specific operation.
In the following research I will show you a cool technique on how that can be bypassed, and someone can gain elevated privileges without any user consent.
eudcedit.exe is the Private Character Editor in Windows (located in C:\Windows\System32), and it is used to create and edit user-defined characters (EUDC: End-User Defined Characters). These characters are custom glyphs that can be mapped to Unicode code points and used in documents or applications.
But before the attack demonstration, let’s understand why that happened and how the auto elevation happens.
Each application has a manifest. In the eudcedit.exe application manifest metadata, there are “instruction” to Windows to elevate it automatically, we can see that in the following picture:
Application manifest
Let’s break down the two critical tags:
The following flow demonstrates the UAC Bypass:
First let’s run eudcedit:
Eudcedit Execution
Press Ok.
The next step is to press on file and then font links:
Choose the second option and press on “Save As”:
In the window that opened just type “PowerShell”, and the UAC Bypass will be completed:
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UAC is the gate keeper to prevent unauthorized attempts that involve high privileges. When an installation occurs or a change in system settings that require administrator privileges, the UAC window is being prompted, and a user interaction is required in order to proceed with the specific operation.
In the following research I will show you a cool technique on how that can be bypassed, and someone can gain elevated privileges without any user consent.
eudcedit.exe is the Private Character Editor in Windows (located in C:\Windows\System32), and it is used to create and edit user-defined characters (EUDC: End-User Defined Characters). These characters are custom glyphs that can be mapped to Unicode code points and used in documents or applications.
But before the attack demonstration, let’s understand why that happened and how the auto elevation happens.
Each application has a manifest. In the eudcedit.exe application manifest metadata, there are “instruction” to Windows to elevate it automatically, we can see that in the following picture:
Application manifest
Let’s break down the two critical tags:
- <requestedExecutionLevel level=”requireAdministrator” />
Instructs Windows to run the binary with full admin rights. - <autoElevate>true</autoElevate>
Tells the system to bypass the UAC prompt for trusted binaries when launched by administrative users.
The following flow demonstrates the UAC Bypass:
First let’s run eudcedit:
Eudcedit Execution
Press Ok.
The next step is to press on file and then font links:
Choose the second option and press on “Save As”:
In the window that opened just type “PowerShell”, and the UAC Bypass will be completed:
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