CVE-2020-7477 : Vulnerability Insights and Analysis
Learn about CVE-2020-7477, a CWE-754 vulnerability in Schneider Electric's Modicon Quantum Ethernet Network module and Quantum / Premium COPRO, potentially leading to a Denial of Service attack. Find out how to mitigate and prevent this security risk.
A CWE-754 vulnerability exists in Schneider Electric's Modicon Quantum Ethernet Network module and Quantum / Premium COPRO, potentially leading to a Denial of Service attack.
Understanding CVE-2020-7477
This CVE involves an Improper Check for Unusual or Exceptional Conditions vulnerability in specific Schneider Electric products.
What is CVE-2020-7477?
The vulnerability affects the Quantum Ethernet Network module 140NOE771x1 (Versions 7.0 and prior), Quantum processors with integrated Ethernet, and Premium processors with integrated Ethernet. It could be exploited by sending a specially crafted command over Modbus, resulting in a Denial of Service.
The Impact of CVE-2020-7477
The vulnerability could allow attackers to disrupt the normal operation of affected devices, potentially leading to service unavailability or downtime.
Technical Details of CVE-2020-7477
This section provides more technical insights into the vulnerability.
Vulnerability Description
The CWE-754 vulnerability arises from an improper check for unusual or exceptional conditions in the affected Schneider Electric products.
Affected Systems and Versions
- Modicon Quantum Ethernet Network module 140NOE771x1 (Versions 7.0 and prior)
- Quantum processors with integrated Ethernet – 140CPU65xxxxx (all Versions)
- Premium processors with integrated Ethernet (all Versions)
Exploitation Mechanism
Attackers can exploit this vulnerability by sending a specifically crafted command over Modbus to trigger a Denial of Service condition.
Mitigation and Prevention
Protecting systems from CVE-2020-7477 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by Schneider Electric.
- Implement network segmentation to limit the impact of potential attacks.
- Monitor network traffic for any suspicious activity.
Long-Term Security Practices
- Regularly update and patch all software and firmware.
- Conduct security assessments and penetration testing on industrial control systems.
- Educate personnel on cybersecurity best practices.
Patching and Updates
Schneider Electric may release patches or updates to address the vulnerability. Stay informed about security advisories and apply patches promptly.