Summary
The Web-Based Management (WBM) of WAGOs programmable logic controller (PLC) is typically used for commissioning and update. The controller is an embedded device which has limited resources. The vulnerability described here takes advantage of this fact.With special crafted requests it is possible to have a denial of service of the WBM.
Details
Impact
The default configuration of the web server limits the number of concurrent processes, which can be abused to cause a DoS of the WBM.This vulnerability allows an attacker, who has access to the device, to cause a denial of service of the WBM, by sending special crafted requests.
Mitigation
- Follow the instructions in WAGOs handbook Cyber Security for Controller
- Restrict network access to the device.
- Do not directly connect the device to the internet
Due to the limited resources on the embedded device, it is necessary to protect it from unauthorized access such as denial of service attacks.
Vulnerabilities 1
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Unscored —
The WBM web application on firmwares prior to 03.02.02 and 03.01.07 on the WAGO PFC100 and PFC2000, respectively, runs …
Revision history
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#1
Initial revision.
References
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VDE-2020-007: WAGO: Web-Based Management Denial of Service - HTML
https://certvde.com/en/advisories/VDE-2020-007/
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Vendor PSIRT
https://www.wago.com/psirt
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CERT@VDE Security Advisories for WAGO GmbH & Co. KG
https://certvde.com/en/advisories/vendor/wago/