Executive Summary

This vulnerability is an unquoted service path issue in ActivIdentity version 8.2's 'ac.sharedstore' Windows service. Because the executable path contains spaces and is not enclosed in quotes, a local attacker can place a malicious executable in a directory along the service path. When the service starts, Windows may execute the malicious file instead of the intended one, allowing the attacker to run arbitrary code with elevated privileges. [1, 2]

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Impact Analysis

Exploiting this vulnerability allows a local attacker to execute arbitrary code with elevated privileges on the affected system. This can lead to privilege escalation, compromising system confidentiality, integrity, and availability, potentially allowing the attacker to take full control of the system. [1, 2]

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Detection Guidance

You can detect this vulnerability by checking the service configuration for the 'ac.sharedstore' service to see if its executable path is unquoted. A suggested command on Windows is: sc qc ac.sharedstore. This command will display the service configuration, including the binary path. If the path is unquoted and contains spaces (e.g., C:\Program Files\Common Files\ActivIdentity\ac.sharedstore.exe), the system is vulnerable to this unquoted service path issue. [1]

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Mitigation Strategies

Immediate mitigation steps include correcting the service executable path by enclosing it in quotes to prevent exploitation. This can be done by modifying the service configuration to quote the binary path, for example: "C:\Program Files\Common Files\ActivIdentity\ac.sharedstore.exe". Additionally, ensure that no malicious executables exist in directories along the service path and restrict write permissions to these directories to prevent attackers from placing malicious files. [1, 2]

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