Executive Summary

This vulnerability is an improper handling of length parameter inconsistency in the web server function of Mitsubishi Electric's MELSEC iQ-F Series CPU modules. Specifically, when the web server processes specially crafted HTTP requests with malformed length parameters, it fails to handle them correctly, which can disrupt normal service operation and cause a denial-of-service (DoS) condition. [1]

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Impact Analysis

The vulnerability allows a remote unauthenticated attacker to delay the processing of the web server function and prevent legitimate users from utilizing it. This results in a denial-of-service (DoS) condition, meaning the affected web server becomes unavailable or unresponsive, impacting availability of the service. [1]

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Detection Guidance

The vulnerability involves sending specially crafted HTTP requests with malformed length parameters to the MELSEC iQ-F Series CPU module's web server function. Detection can be attempted by monitoring network traffic for unusual or malformed HTTP requests targeting the affected devices. Specific commands or tools are not provided in the available resources. Users should verify affected product models and firmware versions as part of detection efforts. [1]

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Mitigation Strategies

Since no fixed firmware update is planned, immediate mitigation involves applying the mitigation and workaround measures recommended by Mitsubishi Electric Corporation as detailed in their guidance. Users should consult official advisories from Mitsubishi Electric and JPCERT/CC for specific mitigation steps. Additionally, monitoring and restricting access to the web server function on affected MELSEC iQ-F Series CPU modules can help reduce risk. [1]

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