# Application Escape and Breakout

## Summary

* [Gaining a command shell](#gaining-a-command-shell)
* [Sticky Keys](#explorer---sticky-keys)
* [Dialog Boxes](#dialog-boxes)
    * [Creating new files](#creating-new-files)
    * [Open a new Windows Explorer instance](#open-a-new-windows-explorer-instance)
    * [Exploring Context Menus](#exploring-context-menus)
    * [Save as](#save-as)
    * [Input Boxes](#input-boxes)
    * [Bypass file restrictions](#bypass-file-restrictions)
* [Internet Explorer](#internet-explorer)
* [Shell URI Handlers](#shell-uri-handlers)
* [References](#references)

## Gaining a command shell

* **Shortcut**
    * [Window] + [R] -> cmd 
    * [CTRL] + [ALT] + [SHIFT] -> Task Manager
* **Access through file browser**: Browsing to the folder containing the binary (i.e. `C:\windows\system32\`), we can simply right click and `open` it
* **Drag-and-drop**: dragging and dropping any file onto the cmd.exe 
* **Hyperlink**: `file:///c:/Windows/System32/cmd.exe`
* **Task Manager**: `File` > `New Task (Run...)`
* **MSPAINT.exe**
    * Open MSPaint.exe and set the canvas size to: Width=6 and Height=1 pixels
    * Zoom in to make the following tasks easier
    * Using the colour picker, set pixels values to (from left to right):
        * 1st: R: 10, G: 0, B: 0
        * 2nd: R: 13, G: 10, B: 13
        * 3rd: R: 100, G: 109, B: 99
        * 4th: R: 120, G: 101, B: 46
        * 5th: R: 0, G: 0, B: 101
        * 6th: R: 0, G: 0, B: 0
    * Save it as 24-bit Bitmap (*.bmp;*.dib)
    * Change its extension from bmp to bat and run 


## Sticky Keys

* Spawn the sticky keys dialog
    * Via Shell URI : `shell:::{20D04FE0-3AEA-1069-A2D8-08002B30309D}`
    * Hit 5 times [SHIFT]
* Visit "Ease of Access Center"
* You land on "Setup Sticky Keys", move up a level on "Ease of Access Center"
* Start the OSK (On-Screen-Keyboard)
* You can now use the keyboard shortcut (CTRL+N)

## Dialog Boxes

### Creating new files

* Batch files – Right click > New > Text File > rename to .BAT (or .CMD) > edit > open
* Shortcuts – Right click > New > Shortcut > `%WINDIR%\system32`

## Open a new Windows Explorer instance

* Right click any folder > select `Open in new window`

## Exploring Context Menus

* Right click any file/folder and explore context menus
* Clicking `Properties`, especially on shortcuts, can yield further access via `Open File Location`

### Save as

* "Save as" / "Open as" option
* "Print" feature – selecting "print to file" option (XPS/PDF/etc)
* `\\127.0.0.1\c$\Windows\System32\` and execute `cmd.exe`

### Input Boxes

Many input boxes accept file paths; try all inputs with UNC paths such as `//attacker–pc/` or `//127.0.0.1/c$` or `C:\`


### Bypass file restrictions

Enter *.* or *.exe or similar in `File name` box

## Internet Explorer

### Download and Run/Open

* Text files -> opened by Notepad

### Menus

* The address bar
* Search menus
* Help menus
* Print menus
* All other menus that provide dialog boxes

## Shell URI Handlers

* shell:DocumentsLibrary
* shell:Librariesshell:UserProfiles
* shell:Personal
* shell:SearchHomeFolder
* shell:System shell:NetworkPlacesFolder
* shell:SendTo
* shell:Common Administrative Tools
* shell:MyComputerFolder
* shell:InternetFolder

## References

* [PentestPartners - Breaking out of Citrix and other restricted desktop environments](https://www.pentestpartners.com/security-blog/breaking-out-of-citrix-and-other-restricted-desktop-environments/)
* [Breaking Out! of Applications Deployed via Terminal Services, Citrix, and Kiosks - Scott Sutherland - May 22nd, 2013](https://blog.netspi.com/breaking-out-of-applications-deployed-via-terminal-services-citrix-and-kiosks/)