CVE-2019-6535 : What You Need to Know

CVE-2019-6535 was published on January 29, 2019, by ICS-CERT. The vulnerability affects Mitsubishi Electric Q03/04/06/13/26UDVCPU and Q04/06/13/26UDPVCPU devices with specific serial numbers, allowing a remote attack that can crash the Ethernet stack.

Understanding CVE-2019-6535

This CVE entry identifies a vulnerability in certain Mitsubishi Electric devices that could be exploited remotely, leading to a denial of service.

What is CVE-2019-6535?

The vulnerability in Mitsubishi Electric Q03/04/06/13/26UDVCPU and Q04/06/13/26UDPVCPU devices allows a remote attacker to crash the Ethernet stack by sending specific bytes over Port 5007.

The Impact of CVE-2019-6535

The vulnerability poses a risk of a denial-of-service attack on the affected devices, potentially disrupting critical operations and services.

Technical Details of CVE-2019-6535

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability involves uncontrolled resource consumption (CWE-400), leading to a resource exhaustion condition in the Ethernet stack of the affected Mitsubishi Electric devices.

Affected Systems and Versions

Mitsubishi Electric Q03/04/06/13/26UDVCPU: serial number 20081 and prior
Mitsubishi Electric Q04/06/13/26UDPVCPU: serial number 20081 and prior
Mitsubishi Electric Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 20101 and prior

Exploitation Mechanism

The vulnerability can be exploited by sending specific bytes over Port 5007, triggering a crash in the Ethernet stack of the affected devices.

Mitigation and Prevention

Protecting systems from CVE-2019-6535 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates to mitigate the vulnerability.
Implement network segmentation to limit exposure to potential attacks.
Monitor network traffic for any suspicious activity targeting Port 5007.

Long-Term Security Practices

Regularly update and patch all software and firmware on critical devices.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.
Educate personnel on cybersecurity best practices to enhance overall security posture.

Patching and Updates

Mitsubishi Electric may release patches or updates to address the vulnerability. Stay informed about security advisories and apply patches promptly.