CVE-2020-37102 in Web Companion
Summary
by MITRE • 02/03/2026
Adaware Web Companion 4.9.2159 contains an unquoted service path vulnerability in the WCAssistantService that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted binary path to inject malicious executables that will be run with LocalSystem privileges during service startup.
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Analysis
by VulDB Data Team • 02/03/2026
The vulnerability identified as CVE-2020-37102 affects Adaware Web Companion version 4.9.2159 and represents a critical security flaw in the Windows service configuration. This issue stems from an improperly quoted service binary path that creates an exploitable condition within the Windows service architecture. The affected service named WCAssistantService operates with elevated LocalSystem privileges, making the potential impact of exploitation particularly severe. The vulnerability manifests when the service path contains spaces but lacks proper quotation marks around the entire path, creating opportunities for privilege escalation attacks.
The technical implementation of this flaw resides in the Windows service installation process where the service binary path is not properly escaped or quoted during registration. When Windows attempts to start the service, it follows a predictable execution flow that can be manipulated by local attackers. The service path typically resolves to a location where the attacker can place a malicious executable with the same name as the service binary, or a component within the path that lacks proper quoting. This creates a race condition or path traversal scenario where the system loads the attacker-controlled binary instead of the legitimate service executable. The vulnerability directly maps to CWE-428, which describes the weakness of unquoted service paths, and represents a classic privilege escalation vector that aligns with ATT&CK technique T1068.
The operational impact of this vulnerability extends beyond simple code execution as it provides attackers with a persistent foothold at the highest privilege level available on the system. Local attackers who can manipulate the service path or place malicious binaries in the service directory can achieve system compromise without requiring additional attack vectors or user interaction. The service runs with LocalSystem privileges, meaning that any code executed through this vulnerability gains complete control over the target system, including access to all files, registry entries, and network resources. This makes the vulnerability particularly dangerous in enterprise environments where multiple users may have local access to systems running the vulnerable software. The attack surface is further expanded by the fact that service paths are often configured during installation and may not be regularly audited for proper quoting.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term prevention measures. The most direct solution involves properly quoting the service binary path during installation or service configuration, ensuring that all components containing spaces are enclosed in quotation marks. System administrators should conduct comprehensive audits of installed services to identify other unquoted paths that may present similar vulnerabilities. Regular security assessments should include service path validation as part of baseline security reviews. Additionally, implementing least privilege principles and using service accounts with minimal required permissions can reduce the impact of such vulnerabilities. The Windows Security Center and group policy configurations should be reviewed to ensure proper service hardening practices are in place. Organizations should also consider implementing application control measures such as Windows Defender Application Control or similar technologies to prevent execution of unauthorized binaries. Regular patch management processes must be established to ensure that vulnerable software versions are promptly updated and that the service path configuration follows secure coding practices. This vulnerability demonstrates the critical importance of proper service path management in Windows environments and aligns with security frameworks that emphasize the principle of least privilege and secure configuration management.