Brother SAPSprint Unquoted Service Path Privilege Escalation

Executive Summary

Brother SAPSprint version 7.60 contains an unquoted service path vulnerability in its SAPSprint service binary. This means the service's executable path includes spaces but is not enclosed in quotes, which can be exploited by local attackers.

Attackers can place a malicious executable in the Program Files directory path. Because the service runs automatically with LocalSystem privileges, the malicious executable will be run with those elevated privileges when the service starts.

This vulnerability allows local privilege escalation by exploiting the unquoted service path to execute arbitrary code with elevated rights.

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Impact Analysis

This vulnerability can allow a local attacker to escalate their privileges on the affected system.

By placing a malicious executable in the Program Files directory, the attacker can have their code executed with LocalSystem privileges when the SAPSprint service starts automatically.

This elevated access can lead to full control over the system, potentially allowing the attacker to install malware, access sensitive data, or disrupt system operations.

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Detection Guidance

This vulnerability can be detected by checking the service configuration for unquoted paths that contain spaces, specifically the SAPSprint service binary path.

You can use Windows commands such as WMIC and SC to query the SAPSprint service configuration and identify if the binary path is unquoted.

• Use the command: wmic service where "name='SAPSprint'" get PathName
• Use the command: sc qc SAPSprint

If the path returned contains spaces and is not enclosed in quotes, the service is vulnerable to this unquoted service path privilege escalation.

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Mitigation Strategies

To mitigate this vulnerability, you should ensure that the service path for SAPSprint is properly quoted to prevent execution of malicious executables placed in the path.

Alternatively, you can restrict write permissions on the directories in the service path, especially the Program Files directory, to prevent attackers from placing malicious executables.

If possible, update or patch the SAPSprint software to a version where this vulnerability is fixed.

As a temporary measure, consider disabling the SAPSprint service if it is not essential.

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Compliance Impact

The vulnerability allows local attackers to escalate privileges to LocalSystem level by exploiting an unquoted service path in the Brother SAPSprint service. This elevated access could potentially enable unauthorized access to sensitive data or system controls.

Such unauthorized privilege escalation may impact compliance with standards and regulations like GDPR and HIPAA, which require strict controls on access to personal and sensitive information. If exploited, this vulnerability could lead to data breaches or unauthorized data manipulation, thereby violating these compliance requirements.

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