CVE-2020-5658 : Security Advisory and Response

A Resource Management Errors vulnerability in the TCP/IP function of the MELSEC iQ-R series allows remote unauthenticated attackers to disrupt network functions.

Understanding CVE-2020-5658

This CVE involves a critical vulnerability in the firmware of specific modules within the MELSEC iQ-R series.

What is CVE-2020-5658?

The CVE-2020-5658 vulnerability is related to Resource Management Errors in the TCP/IP function of the MELSEC iQ-R series, potentially enabling attackers to halt network operations through malicious packets.

The Impact of CVE-2020-5658

The vulnerability poses a significant risk as it allows remote unauthenticated attackers to disrupt the network functions of affected products, potentially leading to operational downtime and security breaches.

Technical Details of CVE-2020-5658

This section provides detailed technical insights into the CVE.

Vulnerability Description

The vulnerability arises from resource management errors in the TCP/IP function of the MELSEC iQ-R series, affecting specific modules based on their serial number prefixes.

Affected Systems and Versions

Product: MELSEC iQ-R series
Vendor: Mitsubishi Electric Corporation
Vulnerable Versions: RJ71EIP91, RJ71PN92, RD81DL96, RD81MES96N, RD81OPC96

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted packets to the affected modules, causing network disruptions.

Mitigation and Prevention

Protecting systems from CVE-2020-5658 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply patches or firmware updates provided by Mitsubishi Electric Corporation.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Conduct regular security assessments and audits to identify vulnerabilities.
Train employees on cybersecurity best practices to enhance overall awareness.

Patching and Updates

Regularly check for security advisories and updates from Mitsubishi Electric Corporation.
Ensure timely installation of patches to mitigate known vulnerabilities.