CVE-2019-10977 : Vulnerability Insights and Analysis

The Mitsubishi Electric MELSEC-Q series Ethernet module, specifically the QJ71E71-100 with a serial number of 20121 or earlier, is vulnerable to a malicious attack that can lead to a denial-of-service situation.

Understanding CVE-2019-10977

This CVE involves a vulnerability in the Mitsubishi Electric MELSEC-Q series Ethernet module that allows attackers to trigger a denial-of-service condition.

What is CVE-2019-10977?

This CVE pertains to a flaw in the QJ71E71-100 Ethernet module that enables attackers to send manipulated TCP packets to the FTP service, causing targeted devices to enter an error mode and resulting in a denial-of-service scenario.

The Impact of CVE-2019-10977

The vulnerability can be exploited by attackers to disrupt the normal operation of devices utilizing the affected Ethernet module, potentially leading to service unavailability and operational issues.

Technical Details of CVE-2019-10977

The technical aspects of the CVE provide insight into the vulnerability and its implications.

Vulnerability Description

The vulnerability in the MELSEC-Q series Ethernet module allows attackers to send crafted TCP packets to the FTP service, triggering devices to enter an error mode and causing a denial-of-service condition.

Affected Systems and Versions

Product: MELSEC-Q series Ethernet module
Vendor: Mitsubishi Electric
Vulnerable Version: QJ71E71-100 serial number 20121 and prior

Exploitation Mechanism

Attackers exploit the vulnerability by sending manipulated TCP packets to the FTP service, prompting the targeted devices to enter an error mode and leading to a denial-of-service situation.

Mitigation and Prevention

Protecting systems from CVE-2019-10977 requires immediate actions and long-term security practices.

Immediate Steps to Take

Implement network segmentation to isolate critical devices from potential attacks.
Monitor network traffic for any suspicious activity targeting the FTP service.
Apply firewall rules to restrict unauthorized access to the Ethernet module.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.
Educate personnel on cybersecurity best practices to enhance overall security posture.
Consider implementing intrusion detection systems to detect and respond to malicious activities.

Patching and Updates

Mitsubishi Electric may release patches or updates to address the vulnerability. Ensure timely installation of these patches to mitigate the risk of exploitation.