Executive Summary

CVE-2021-47883 is an unquoted service path vulnerability in Sandboxie Plus version 0.7.2's 'SbieSvc' service. Because the service executable path is not enclosed in quotes, local attackers can place malicious executables in certain locations that the system interprets incorrectly. When the service starts, these malicious executables run with LocalSystem privileges, allowing attackers to execute arbitrary code with elevated rights. [1, 2]

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Impact Analysis

This vulnerability allows local attackers to escalate their privileges by executing arbitrary code with LocalSystem permissions. This means an attacker with limited access can gain full control over the affected system, potentially compromising system integrity, confidentiality, and availability. [1, 2]

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Detection Guidance

You can detect this vulnerability by checking the service executable path for the 'SbieSvc' service to see if it is unquoted. On a Windows system, use the command: sc qc SbieSvc. If the BINARY_PATH_NAME value is unquoted and contains spaces (e.g., C:\Program Files\Sandboxie-Plus\SbieSvc.exe without quotes), the system is vulnerable. Additionally, you can inspect the service properties via the Services MMC snap-in or use PowerShell commands like Get-WmiObject Win32_Service -Filter "Name='SbieSvc'" | Select-Object PathName to verify the executable path. [2]

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Mitigation Strategies

Immediate mitigation involves correcting the unquoted service path by enclosing the executable path in quotes to prevent execution of malicious binaries. Specifically, update the 'SbieSvc' service configuration so that the binary path is quoted, e.g., "C:\Program Files\Sandboxie-Plus\SbieSvc.exe". Alternatively, restrict write permissions on directories in the service path to prevent attackers from placing malicious executables. Also, ensure that the system is patched or updated to a version of Sandboxie Plus where this issue is fixed. [1, 2]

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