# CVE-2024-4877: Windows: A malicious process may spoof the interactive service and potentially impersonate a local user
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In `interactive.c` and OpenVPN-GUI for Windows:
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interactive.c and OpenVPN-GUI for Windows:
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A security vulnerability exists where an attacker without `SeImeprsonatePrivilege` could create a named pipe server with a name that matches the one used by the "Interactive Service". User interfaces such as OpenVPN-GUI, which connect to this named pipe, could be tricked into allowing the attacker to impersonate the user operating the interface.
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If an attacker with !SeImeprsonatePrivilege manages to create a namedpipe server with a name matching that used by the "Interactive Service", user interfaces such as OpenVPN-GUI connecting to it could allow the attacker to impersonate the user running the UI.
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To mitigate this issue, the security of the named pipe has been enhanced. Only processes running as SYSTEM (such as the interactive service) can now create a pipe with the same name. Additionally, to guard against any such pipes that were created before the service started, clients of the service are required to verify that the PID of the pipe server matches that of the service. These changes have been implemented in the OpenVPN-GUI for Windows.
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To address this, we harden the security of the pipe, making it possible only for processes running as SYSTEM (such as the interactive service) create the pipe with the same name. Further, to protect against any such pipes created prior to startup of the service, clients of the service must match the PID of the pipe server with that of the service. This is implemented in OpenVPN-GUI for Windows.
