CVE-2021-20607 : Vulnerability Insights and Analysis

This article provides detailed information about CVE-2021-20607, an Integer Underflow vulnerability affecting Mitsubishi Electric GX Works2, MELSOFT Navigator, and EZSocket software.

Understanding CVE-2021-20607

CVE-2021-20607 is an Integer Underflow vulnerability in Mitsubishi Electric software versions, allowing an attacker to trigger a denial of service (DoS) attack by manipulating a specially crafted project file.

What is CVE-2021-20607?

The CVE-2021-20607 vulnerability exists in Mitsubishi Electric GX Works2 versions 1.606G and earlier, MELSOFT Navigator versions 2.84N and earlier, as well as EZSocket versions 5.4 and earlier. It enables attackers to exploit an Integer Underflow issue and disrupt the software's operation through a malicious file.

The Impact of CVE-2021-20607

The impact of CVE-2021-20607 includes the potential for attackers to destabilize the affected Mitsubishi Electric software, leading to a DoS condition. By tricking a user into opening a malicious project file, threat actors can exploit this security flaw to disrupt operations.

Technical Details of CVE-2021-20607

This section delves into the specifics of the CVE-2021-20607 vulnerability, covering the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The CVE-2021-20607 vulnerability is an Integer Underflow issue within Mitsubishi Electric GX Works2, MELSOFT Navigator, and EZSocket software versions. Attackers can trigger a DoS condition by manipulating specially crafted project files.

Affected Systems and Versions

The vulnerability impacts Mitsubishi Electric GX Works2 versions 1.606G and earlier, MELSOFT Navigator versions 2.84N and earlier, and EZSocket versions 5.4 and earlier. Users of these versions are at risk of exploitation.

Exploitation Mechanism

Exploiting CVE-2021-20607 involves crafting a malicious project file that, when opened by a user on the affected Mitsubishi Electric software versions, triggers an Integer Underflow condition, ultimately leading to a DoS scenario.

Mitigation and Prevention

This section outlines steps for immediate response, long-term security practices, and the importance of patching to mitigate the risk posed by CVE-2021-20607.

Immediate Steps to Take

Users are advised to update their Mitsubishi Electric GX Works2, MELSOFT Navigator, and EZSocket software to patched versions to prevent exploitation. Additionally, exercise caution when handling untrusted project files.

Long-Term Security Practices

Implementing robust security measures, including regular software updates, security training for users, and restricting file execution permissions, can enhance the overall security posture and help mitigate future vulnerabilities.

Patching and Updates

Mitsubishi Electric has released patches to address the CVE-2021-20607 vulnerability. Users should promptly apply these updates to eliminate the risk of DoS attacks and ensure the secure operation of their systems.