| Package | Affected versions | Patched versions |
|---|---|---|
| WixToolset.Util.wixext | < 4.0.5 | 4.0.5 |
| wix | ≥ 4.0.0, < 4.0.5< 3.14.1 | 4.0.53.14.1 |
The custom action behind WiX's RemoveFolderEx functionality could allow a standard user to delete protected directories.
RemoveFolderEx deletes an entire directory tree during installation or uninstallation. It does so by recursing every subdirectory starting at a specified directory and adding each subdirectory to the list of directories Windows Installer should delete. If the setup author instructed RemoveFolderEx to delete a per-user folder from a per-machine installer, an attacker could create a directory junction in that per-user folder pointing to a per-machine, protected directory. Windows Installer, when executing the per-machine installer after approval by an administrator, would delete the target of the directory junction.
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