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:
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:
nc <target-ip> 3299Look for response patterns like:
M2 7200This 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/3200This 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.
saprouter -r -H /H/<saprouter-ip>/S/3299/H/<target-sap-ip>/S/3200Tunneling 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
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.
Learn & practice For the Bug Bounty
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