Executive Summary

CVE-2025-69689 is a local privilege escalation vulnerability in the Fan Control application prior to version V251. It arises from improper privilege handling in the application's Open File Dialog, which processes user-supplied paths with elevated (administrator) permissions.

Specifically, the vulnerability occurs because the application executes file system operations and processes input from the dialog's address bar and selection mechanism with inherited administrative privileges. A local attacker can exploit this by supplying crafted system paths or executable references, causing the application to execute arbitrary commands or binaries with full administrative rights.

This improper privilege management allows an attacker to bypass standard security controls and potentially take complete control of the affected system.

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Impact Analysis

This vulnerability can have severe impacts because it allows a local attacker to escalate their privileges to administrator level on the affected system.

By exploiting the improper privilege handling in the Open File Dialog, an attacker can execute arbitrary commands or code with full administrative rights.

• Complete system compromise
• Bypassing of standard security controls
• Execution of arbitrary code or commands with elevated privileges

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Detection Guidance

This vulnerability is a local privilege escalation issue within the Fan Control application prior to version V251, related to improper privilege handling in its Open File Dialog. Detection involves identifying if the vulnerable version of Fan Control is installed and monitoring for suspicious local activity involving the application's file dialog usage.

Since the vulnerability is exploited locally by supplying crafted paths or executables to the Open File Dialog running with elevated privileges, detection can focus on checking the installed Fan Control version and monitoring for unusual local process executions or privilege escalations.

Suggested commands to detect the vulnerable application version or suspicious activity include:

• Check installed Fan Control version (on Windows PowerShell): Get-Command FanControl | Select-Object Version
• Search for Fan Control executable and check its version: Get-Item 'C:\Path\To\FanControl.exe' | Select-Object VersionInfo
• Monitor for processes launched with elevated privileges related to Fan Control: Use Sysinternals Process Monitor or Windows Event Logs to track process creation events involving FanControl.exe
• Audit local file system and registry changes triggered by Fan Control to detect abnormal behavior.

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Mitigation Strategies

The primary mitigation step is to update the Fan Control application to version V251 or later, where this vulnerability has been fixed.

Additional immediate steps include:

• Restrict local user permissions to prevent unauthorized users from running Fan Control with elevated privileges.
• Avoid running the Fan Control application or its Open File Dialog with administrator privileges unless absolutely necessary.
• Monitor and audit local system activity for suspicious use of the Fan Control application.
• If updating is not immediately possible, consider temporarily disabling or uninstalling the vulnerable Fan Control version.

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Compliance Impact

The vulnerability in the Fan Control application allows a local attacker to escalate privileges to administrator level by exploiting improper privilege handling in the Open File Dialog. This can lead to unauthorized access and control over the system.

Such unauthorized privilege escalation and potential system compromise can negatively impact compliance with common security standards and regulations like GDPR and HIPAA, which require strict controls over access to sensitive data and system integrity.

Specifically, if an attacker exploits this vulnerability, they could bypass security controls designed to protect personal or sensitive information, thereby violating data protection requirements and potentially leading to data breaches.

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