CVE-2021-22659 : Exploit Details and Defense Strategies

CVE-2021-22659: What You Need to Know

This article provides detailed information about CVE-2021-22659, a vulnerability affecting Rockwell Automation MicroLogix 1400 devices. It discusses the impact, technical details, and mitigation steps to prevent exploitation.

Understanding CVE-2021-22659

CVE-2021-22659 involves a vulnerability in Rockwell Automation MicroLogix 1400 Version 21.6 and below, allowing remote unauthenticated attackers to trigger a buffer overflow by sending a specially crafted Modbus packet.

What is CVE-2021-22659?

Rockwell Automation MicroLogix 1400 Version 21.6 and below are susceptible to a remote unauthenticated attack that could lead to a denial-of-service condition. Exploitation of this vulnerability may result in a buffer overflow, causing the device's FAULT LED to flash RED and potential communication loss.

The Impact of CVE-2021-22659

If successfully exploited, this vulnerability could allow attackers to retrieve or modify random values in registers, potentially leading to a denial-of-service condition that requires manual intervention to recover and restore normal device operation.

Technical Details of CVE-2021-22659

Vulnerability Description

The vulnerability in MicroLogix 1400 devices allows remote unauthenticated attackers to manipulate registers through a specially crafted Modbus packet, causing a buffer overflow.

Affected Systems and Versions

Rockwell Automation MicroLogix 1400, All series Version 21.6 and below are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a malicious Modbus packet to trigger a buffer overflow, potentially leading to a denial-of-service condition.

Mitigation and Prevention

Immediate Steps to Take

To mitigate the risk associated with CVE-2021-22659, it is crucial to implement network security measures, restrict access to vulnerable devices, and monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update and patch affected devices, follow secure coding practices, conduct security assessments, and stay informed about potential vulnerabilities and updates from Rockwell Automation.

Patching and Updates

Ensure that Rockwell Automation MicroLogix 1400 devices are running the latest firmware version and security patches provided by the vendor to address known vulnerabilities and enhance the overall security posture of the devices.