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# SAPRouter - Port 3299

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## Basic info

SAP systems are often the crown jewels of enterprise infrastructure. At the heart of many SAP network architectures lies **SAPRouter**, a critical gateway and proxy tool used to filter and control access to SAP services. In this article, we provide a comprehensive, in-depth guide to **penetration testing SAPRouter**, exposing attack vectors, enumeration techniques, and post-exploitation methods — all crafted to help cybersecurity professionals assess and exploit this target efficiently.

***

### What Is SAPRouter and Why It Matters in Pentesting

**SAPRouter** is an application-layer proxy developed by SAP to control traffic between SAP systems, networks, and client applications. It listens by default on TCP port `3299` and acts as a traffic dispatcher with access-control features.

Insecurely configured SAPRouters can allow unauthenticated access to internal SAP services, bypassing traditional firewalls and enabling lateral movement inside the SAP landscape.

***

## Enumerating SAPRouter Services (Port 3299)

### TCP 3299

The default port `3299` is SAPRouter’s listening endpoint. During initial reconnaissance, you should:

```bash
nmap -sV -p 3299 --script saprouter-enum <target-ip>
```

### Banner Grabbing

Manually connecting to the port using `nc` or `telnet` may return valuable banner information:

```bash
nc <target-ip> 3299
```

Look for response patterns like:

```
M2 7200
```

This response indicates a running SAPRouter service.

***

## Bypassing Access Control with Route Strings

SAPRouter uses **route strings** to determine which systems can communicate. A misconfigured or overly permissive `saprouttab` file can open doors to internal SAP systems.

#### Structure of a Route String:

```
/H/<host>/S/<port>
```

You can chain multiple route segments:

```
/H/192.168.0.5/S/3299/H/10.10.10.5/S/3200
```

This allows an external attacker to **pivot** through the SAPRouter into internal SAP services such as **SAP Dispatcher** (3200), **Gateway** (3300), or **Message Server** (3600).

***

## Exploitation Techniques for SAPRouter

#### **Establishing Route Chains**

Misconfigured routers may allow unauthorized clients to create chained connections to restricted internal services.

```bash
saprouter -r -H /H/<saprouter-ip>/S/3299/H/<target-sap-ip>/S/3200
```

#### **Tunneling Arbitrary Traffic**

SAPRouter can be abused as a SOCKS-like proxy. With chained route strings, attackers can tunnel various protocols through SAPRouter to reach services like **Telnet**, **RDP**, or **SAP NetWeaver** endpoints.

#### **Command Injection via Weak ACLs**

If an attacker can manipulate the `saprouttab` file (due to misconfigurations or weak file permissions), they can modify routing rules and inject malicious commands or redirect traffic.

***

### ⚠️ Common SAPRouter Misconfigurations

| Misconfiguration                     | Impact                                       |
| ------------------------------------ | -------------------------------------------- |
| No password or access control        | Full unauthenticated access to route traffic |
| Overly permissive `saprouttab`       | Allows chaining to internal services         |
| Exposure of `saprouttab` via SMB/NFS | Leak of internal route structure             |
| No logging enabled                   | No traceability of attacker activity         |

***

### Chaining SAPRouter with Other Exploits

Once access through SAPRouter is achieved, combine it with:

* **SAP RFC abuse** (via `RFCEXEC`)
* **SAP Gateway exploits** (such as remote command execution)
* **SAP Management Console vulnerabilities**

Route strings can allow pivoting to these services even when not directly exposed externally.

***

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