Siemens SCALANCE X-200RNA Switch Devices
Plan Patch8.8ICS-CERT ICSA-22-349-02Dec 13, 2022
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary
SCALANCE X204RNA Ethernet switch devices contain multiple vulnerabilities in input validation, resource handling, and session management. Versions before 3.2.7 are affected. The vulnerabilities allow remote attackers to cause denial of service, extract sensitive configuration data or credentials, or hijack authenticated user sessions to the management interface. The device management web interface (ports 80/443) and SNMP service (port 161) are the primary attack vectors. No public exploits are known at this time.
What this means
What could happen
An attacker could cause the switch to stop processing network traffic, extract configuration or password data from the device, or hijack admin sessions to gain unauthorized control of network connectivity in your industrial network.
Who's at risk
Water and electric utilities operating Siemens SCALANCE X204RNA Ethernet switches for network redundancy or process connectivity. This includes facilities using HSR (High-availability Seamless Redundancy) or PRP (Parallel Redundancy Protocol) configurations, and those with EEC (Extended Ethernet Connectivity) modules.
How it could be exploited
An attacker on the network sends a malicious request to the SCALANCE X204RNA switch's web interface (port 80/443) or SNMP service (port 161). Due to insufficient input validation and weak session management, the request causes a denial of service, leaks sensitive data from memory, or allows the attacker to intercept and manipulate existing admin sessions.
Prerequisites
- Network access to the SCALANCE X204RNA switch
- Access to at least one of: ports 80/TCP, 443/TCP, 161/UDP, or 22/TCP
- No authentication required for some vulnerabilities
- User interaction may be required for session hijacking attacks
Remotely exploitableNo authentication required for some vectorsLow attack complexityAffects network infrastructure that supports critical control systemsHigh CVSS score (8.8)Multiple vulnerability types (DoS, information disclosure, session hijacking)
Exploitability
Moderate exploit probability (EPSS 2.0%)
Affected products (5)
5 with fix
ProductAffected VersionsFix Status
SCALANCE X204RNA (HSR)<V3.2.73.2.7
SCALANCE X204RNA (PRP)<V3.2.73.2.7
SCALANCE X204RNA EEC (HSR)<V3.2.73.2.7
SCALANCE X204RNA EEC (PRP)<V3.2.73.2.7
SCALANCE X204RNA EEC (PRP/HSR)<V3.2.73.2.7
Remediation & Mitigation
0/6
Do now
0/3WORKAROUNDRestrict network access to ports 22/TCP, 80/TCP, 443/TCP, and 161/UDP to only trusted IP addresses using firewall rules
WORKAROUNDDisable SNMP service if not required for operations
WORKAROUNDDisable the web server if not required for operations
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpdate SCALANCE X204RNA devices to firmware version 3.2.7 or later
Long-term hardening
0/2HARDENINGSegment the industrial control network from business networks using firewalls
HARDENINGImplement network access controls to prevent Internet-facing exposure of control system devices
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