Wago: Multiple vulnerabilities in web-based management of multiple products
Plan Patch8.8VDE-2023-039Mar 13, 2024
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary
Multiple cross-site-scripting vulnerabilities exist in the web-based management interface of WAGO programmable logic controllers. These vulnerabilities allow attackers to inject malicious scripts via configuration data, potentially leading to remote code execution. The vulnerabilities affect several WAGO controller models across firmware versions FW13 and earlier. Fixes are available for some product lines (Ethernet Controller 3rd Gen and Fieldbus Coupler Ethernet 3rd Gen via FW14), but controllers with BACnet/IP and BACnet MS/TP protocols have no fix planned.
What this means
What could happen
An attacker could execute malicious scripts on the web-based management interface, potentially gaining control of PLC configuration and logic, or in some cases running arbitrary code that could alter process behavior or stop operations.
Who's at risk
Manufacturing facilities using WAGO PLCs for process automation, including those running BACnet/IP or MS/TP controllers and Ethernet-based controllers. Specifically affects production control systems where these devices manage critical processes.
How it could be exploited
An attacker crafts a malicious configuration or script that exploits the cross-site-scripting vulnerability in the WBM interface. If the device is accessible over the network and an authorized user loads the malicious content, the attacker's code executes with the same privileges as the user, potentially allowing remote code execution depending on configuration.
Prerequisites
- Network access to the web-based management port (typically port 80/443)
- User with access to the WBM interface must view or interact with the malicious content
- WBM must be enabled on the device
remotely exploitableno authentication requiredlow complexityhigh CVSS score (8.8)no patch available for two product linesaffects control system configuration
Affected products (4)
2 with fix2 EOL
ProductAffected VersionsFix Status
Ethernet Controller 3rd Generation≤ FW13FW14
Fieldbus Coupler Ethernet 3rd Generation≤ FW13FW14
Controller BACnet MS/TP≤ FW13No fix (EOL)
Controller BACnet/IP≤ FW13No fix (EOL)
Remediation & Mitigation
0/6
Do now
0/3WORKAROUNDDisable web-based management via command line if not required for operations
HARDENINGRestrict network access to the WBM port to only authorized engineering workstations and administrative networks
HARDENINGDo not directly connect affected PLC devices to the internet; keep them on isolated or segmented internal networks
Schedule — requires maintenance window
0/3Patching may require device reboot — plan for process interruption
Ethernet Controller 3rd Generation
HOTFIXUpdate Ethernet Controller 3rd Generation to firmware FW14 or later
Fieldbus Coupler Ethernet 3rd Generation
HOTFIXUpdate Fieldbus Coupler Ethernet 3rd Generation to firmware FW14 or later
All products
HARDENINGDisable unused TCP and UDP ports on the device
CVEs (2)
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