WAGO: Web-Based Management Denial of Service
VDE-2020-007 (2020-03-09 10:10 UTC+0100)
CVE Identifier
CVE-2019-5149Affected Vendors
WAGO
Affected Products
Article Name | Article Number | Version |
Series PFC100 | 750-81xx/xxx-xxx | All FW versions => 5 are affected |
Series PFC200 | 750-82xx/xxx-xxx | |
Touch Panel 600 Standard Line | 762-4xxx | |
Touch Panel 600 Advanced Line | 762-5xxx | |
Touch Panel 600 Marine Line | 762-6xxx |
Vulnerability Type
Insufficient Resource Pool (CWE-410)
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.
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.
Solution
Due to the limited resources on the embedded device, it is necessary to protect it from unauthorized access such as denial of service attacks.
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
Reported by
This vulnerability was reported by Daniel Patrick DeSantis, Cisco Talos to WAGO. Coordination done by CERT@VDE.