CVE-2023-4625 : What You Need to Know

This is a detailed overview of CVE-2023-4625, a Denial of Service (DoS) vulnerability present in Mitsubishi Electric Corporation MELSEC iQ-F Series CPU modules' Web server function. The vulnerability allows an unauthenticated remote attacker to disrupt legitimate users' access to the Web server function by continuously attempting unauthorized logins, resulting in a denial of service situation.

Understanding CVE-2023-4625

The vulnerability identified as CVE-2023-4625 in the Mitsubishi Electric Corporation MELSEC iQ-F Series CPU modules impacts the availability of the Web server function, causing a Denial of Service (DoS) condition.

What is CVE-2023-4625?

The CVE-2023-4625 vulnerability involves an Improper Restriction of Excessive Authentication Attempts within the Web server function of the MELSEC iQ-F Series CPU modules. This flaw allows remote attackers to prevent legitimate users from accessing the Web server function by repeatedly attempting unauthorized logins.

The Impact of CVE-2023-4625

The primary impact of CVE-2023-4625 is a Denial of Service (DoS) situation. Hackers can continuously login illegally, leading to a scenario where legitimate users are unable to access the Web server function during the attacker's unauthorized login attempts.

Technical Details of CVE-2023-4625

The vulnerability is classified under CWE-307: Improper Restriction of Excessive Authentication Attempts and has a CVSSv3.1 base score of 5.3, categorizing it as a medium severity issue. It has a low attack complexity and is exploitable over a network without the need for user interaction.

Vulnerability Description

The vulnerability arises due to improper authentication control within the Web server function of the MELSEC iQ-F Series CPU modules, enabling an attacker to disrupt access for legitimate users.

Affected Systems and Versions

The vulnerability impacts all versions of the MELSEC iQ-F Series CPU modules for specific serial number ranges, as detailed in the vendor's advisory.

Exploitation Mechanism

Attackers can exploit the vulnerability by continuously attempting unauthorized logins to the Web server function, causing a DoS condition that persists as long as the unauthorized login attempts continue.

Mitigation and Prevention

To address CVE-2023-4625, organizations should take immediate steps to secure their systems and implement long-term security practices to prevent similar incidents in the future.

Immediate Steps to Take

Review and apply patches or security updates provided by Mitsubishi Electric Corporation.
Monitor network traffic for any suspicious login attempts or denial of service patterns.
Implement network segmentation and access controls to limit exposure to potential attacks.

Long-Term Security Practices

Regularly conduct security assessments and penetration testing on critical systems.
Train employees on cybersecurity best practices to prevent unauthorized access attempts.
Stay informed about potential vulnerabilities and security advisories related to the MELSEC iQ-F Series CPU modules.

Patching and Updates

It is crucial to promptly apply any patches or updates released by Mitsubishi Electric Corporation to address the CVE-2023-4625 vulnerability and enhance the security of the affected systems.