CVE-2020-12506 Explained : Impact and Mitigation

A vulnerability in WAGO 750-8XX series with FW version <= FW03 allows unauthorized settings changes, posing a critical risk.

Understanding CVE-2020-12506

This CVE involves an authentication bypass vulnerability in specific WAGO devices, potentially leading to unauthorized access.

What is CVE-2020-12506?

This CVE identifies an Improper Authentication flaw in WAGO 750-8XX series devices with FW version <= FW03, enabling attackers to manipulate device settings without proper authentication.

The Impact of CVE-2020-12506

The vulnerability has a CVSS base score of 9.1 (Critical severity) due to its potential for high availability and integrity impact, allowing attackers to exploit the flaw remotely.

Technical Details of CVE-2020-12506

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability allows attackers to change device settings by sending crafted requests without authentication, affecting various WAGO products.

Affected Systems and Versions

Products: WAGO 750-362, 750-363, 750-823, 750-832/xxx-xxx, 750-862, 750-891, 750-890/xxx-xxx
Versions: FW03 and prior

Exploitation Mechanism

Attackers exploit the vulnerability by sending specially crafted requests to the affected devices over the network, bypassing authentication mechanisms.

Mitigation and Prevention

Protecting systems from CVE-2020-12506 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade devices to the latest standard firmware (> FW03)
Restrict network access to the device
Avoid direct internet connections
Disable unused TCP/UDP ports
Deactivate web-based management ports 80/443 post-configuration

Long-Term Security Practices

Regularly update firmware and security patches
Implement network segmentation and access controls
Conduct security audits and assessments

Patching and Updates

Ensure all affected devices are updated to firmware versions above FW03 to mitigate the vulnerability effectively.