CVE-2020-8476 Explained : Impact and Mitigation

CVE-2020-8476 is an elevation of privilege vulnerability in the Central Licensing Server component used in various ABB products. Attackers can manipulate licenses by sending crafted messages to the CLS web service.

Understanding CVE-2020-8476

What is CVE-2020-8476?

This CVE identifies a weakness in input validation that allows unauthorized alteration of licenses in ABB products.

The Impact of CVE-2020-8476

The vulnerability can lead to unauthorized changes in system licenses, potentially compromising the integrity of the affected systems.

Technical Details of CVE-2020-8476

Vulnerability Description

The vulnerability arises from inadequate input validation, enabling attackers to modify licenses assigned to system nodes through specially crafted messages.

Affected Systems and Versions

ABB Central Licensing System: Version 5.1
ABB Ability System 800xA: Versions 5.1, 6.0, 6.1
Compact HMI: Versions 5.1, 6.0
Control Builder Safe: Versions 1.0, 1.1, 2.0
Symphony Plus S+ Operations: Versions 3.0 to 3.2
And more

Exploitation Mechanism

Attackers exploit the vulnerability by sending manipulated messages to the CLS web service, allowing them to alter system licenses.

Mitigation and Prevention

Immediate Steps to Take

Apply vendor-provided patches and updates promptly.
Monitor system logs for any suspicious activities related to license modifications.
Restrict network access to the CLS web service to authorized users only.

Long-Term Security Practices

Regularly update and patch all software and systems to prevent vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

ABB has released patches to address the vulnerability. Ensure all affected systems are updated with the latest patches to mitigate the risk of exploitation.