Executive Summary

The Realtek High Definition Audio Driver version 6.0.1.6730 contains an unquoted service path vulnerability. This means that the path to the service executable is not enclosed in quotes, which can cause the system to misinterpret parts of the path as separate executable files.

An attacker with local access can exploit this by placing a malicious executable file in a directory that is part of the unquoted service path. When the service restarts or the system reboots, the malicious executable is run with LocalSystem privileges, allowing the attacker to escalate their privileges on the system.

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Impact Analysis

This vulnerability allows a local attacker to escalate their privileges from a low-privilege user to LocalSystem, which is the highest level of privilege on a Windows system.

With LocalSystem privileges, an attacker can execute arbitrary code, potentially leading to full system compromise. This can affect the confidentiality, integrity, and availability of the system and its data.

The exploit requires local access but does not require user interaction, making it a significant security risk.

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Detection Guidance

This vulnerability can be detected by checking for unquoted service paths related to the Realtek High Definition Audio Driver, specifically the "RtkAudioService" service.

A common method is to query the service path and look for unquoted spaces in the executable path.

• Use the command: sc qc RtkAudioService
• Check the output for unquoted paths containing spaces, for example: C:\Program Files\Realtek\Audio\RtkAudioService.exe without quotes.
• Alternatively, use PowerShell to find unquoted service paths: Get-WmiObject win32_service | where {$_.PathName -like '* *' -and $_.PathName -notlike '"*"'} | select Name, PathName

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Mitigation Strategies

To mitigate this vulnerability, immediately ensure that the service path for the Realtek High Definition Audio Driver is properly quoted.

This prevents the system from interpreting malicious executables placed in the service path.

• Manually edit the service path to include quotes around the executable path using the command: sc config RtkAudioService binPath= ""C:\Program Files\Realtek\Audio\RtkAudioService.exe""
• Restrict write permissions on directories in the service path to prevent unauthorized users from placing executables.
• Restart the service after applying the fix to ensure the changes take effect.

Additionally, ensure that only trusted users have local access to the system, as the exploit requires local access.

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Compliance Impact

The vulnerability allows local attackers to escalate privileges to LocalSystem level, potentially leading to full system compromise.

Such unauthorized privilege escalation can result in unauthorized access to sensitive data, which may impact compliance with standards and regulations like GDPR and HIPAA that require protection of confidentiality, integrity, and availability of data.

However, the provided information does not explicitly discuss compliance impacts or specific regulatory consequences.

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