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The Anatomy of COM Server-Based Binary Planting Exploits |
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The Anatomy of COM Server-Based Binary Planting Exploits Par Hack In The BoxLe [2011-05-25] à 01:32:24
Présentation : Last week at the Hack In The Box conference in Amsterdam we presented some techniques for advanced exploitation of binary planting bugs. The stage was set by our previous blog post where we described how unsafely registered COM server DLLs, as well as safely registered COM server DLLs that make unsafe binary loading calls, could be abused for mounting binary planting attacks. This post reveals our work to the rest of the world. One of the elements we used in our exploits were Windows special folders. Special folders are folders that can be shown by Windows Explorer but don't always behave like ordinary folders, which simply contain files and other folders. Some examples of special folders are Control Panel, My Computer, My Documents, Administrative Tools and Printers. Every one of these special folders is implemented as an in-process COM server with a specific class identifier CLSID . For instance, the CLSID of My Computer is 20D04FE0-3AEA-1069-A2D8-08002B30309D . Let's begin with a small magic trick works on XP, Vista and Windows 7 Create a new empty folder anywhere on your file system and rename it to folder. 20D04FE0-3AEA-1069-A2D8-08002B30309D . Note that the CLSID must be the extension of the folder name, i.e., must come after the final dot. Immediately after renaming, the folder's icon will be changed to the icon of My Computer and, moreover, opening the folder will actually show the My Computer content.
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