CVE-2020-36933 in IPTInstaller
Summary
by MITRE • 01/25/2026
HTC IPTInstaller 4.0.9 contains an unquoted service path vulnerability in the PassThru Service configuration. Attackers can exploit the unquoted binary path to inject and execute malicious code with elevated LocalSystem privileges.
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Analysis
by VulDB Data Team • 01/26/2026
The vulnerability identified as CVE-2020-36933 resides within HTC IPTInstaller version 4.0.9, specifically targeting the PassThru Service component through an unquoted service path configuration. This flaw represents a classic Windows service misconfiguration that exploits the operating system's service path resolution behavior. When a service path contains spaces and is not properly quoted, the Windows service manager will attempt to execute the program by traversing the path components until it finds a valid executable, creating opportunities for path traversal attacks. The vulnerability directly maps to CWE-428, which describes the condition where an application uses a command or path that contains unquoted strings, allowing attackers to inject malicious code at specific points in the path.
The technical exploitation of this vulnerability occurs when an attacker places a malicious executable at a location that falls within the service path traversal sequence, typically in directories that are part of the system PATH environment variable or in locations where the service will search for executables. In the context of HTC IPTInstaller, the PassThru Service configuration allows for arbitrary code execution with LocalSystem privileges, which represents the highest level of access available to Windows services. This privilege escalation capability stems from the service running under the LocalSystem account context, which possesses extensive system-level permissions including registry access, file system modifications, and the ability to interact with other system services.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with persistent access to the compromised system with elevated privileges. The LocalSystem account has unrestricted access to all system resources, making this vulnerability particularly dangerous for environments where sensitive data resides or where the system serves as a critical infrastructure component. Attackers can leverage this privilege escalation to establish backdoors, exfiltrate data, modify system configurations, or deploy additional malware payloads. The vulnerability affects any system running HTC IPTInstaller 4.0.9 where the service is configured to run with LocalSystem privileges, potentially impacting enterprise networks where multiple systems may be affected.
Mitigation strategies for CVE-2020-36933 should focus on correcting the service path configuration by ensuring all service paths containing spaces are properly quoted. This approach aligns with the principle of least privilege and follows the ATT&CK framework's mitigation guidance for service execution techniques. Organizations should immediately update to HTC IPTInstaller version 4.0.10 or later, which addresses this specific vulnerability. Additionally, security administrators should conduct thorough service path audits across all systems to identify similar unquoted service path configurations that may present analogous risks. The implementation of Windows Defender Application Control or similar application whitelisting solutions can provide an additional layer of defense by preventing unauthorized executable code from running, even if an attacker successfully exploits the unquoted path vulnerability. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar service misconfigurations that may exist within the organization's IT infrastructure.