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Microsoft Windows Vulnerabilities

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Abusing Insecure Windows Communication Foundation (WCF) Endpoints

Presentation

Exploit Development

Abusing Insecure Windows Communication Foundation (WCF) Endpoints

A trend that the VerSprite Research team noticed in .NET services is the exposure of dangerous methods through insecure WCF endpoints. Download this presentation for a high-level overview of the WCF terminals and receive a practical analysis.

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Insecure Windows Communication Foundation Endpoints

Blog Post

Microsoft Windows Vulnerabilities

Abusing Insecure Windows Communication Foundation (WCF) Endpoints

During an audit of several Windows VPN services, we identified several WCF endpoints that offered direct control of command line parameters used in the creation of an elevated process. This allowed for local privilege escalation to the SYSTEM user.

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TunnelBear for Windows vulnerability

Advisory

Microsoft Windows Vulnerabilities

TunnelBear for Windows

TunnelBear for Windows suffers from a SYSTEM privilege escalation vulnerability through the TunnelBearMaintenanceservice. This service establishes an NetNamedPipe endpoint that allows arbitrary installed applications to connect and call publicly exposed methods.

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CyberGhost 6 for Windows vulnerability

Advisory

Microsoft Windows Vulnerabilities

CyberGhost 6 for Windows

CyberGhost 6 for Windows suffers from a SYSTEM privilege escalation vulnerability through the CG6Service service. This service establishes an NetNamedPipe endpoint that allows arbitrary installed applications to connect and call publicly exposed methods. The ConnectToVpnServer method accepts a connectionParams argument that provides attacker control of the OpenVpn command line.

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SaferVPN for Windows vulnerability

Advisory

Microsoft Windows Vulnerabilities

SaferVPN for Windows

SaferVPN for Windows suffers from a SYSTEM privilege escalation vulnerability in its SaferVPN.Service service. The SaferVPN.Service service executes openvpn.exe using OpenVPN config files located within the current user’s local application data directory i.e. \AppData\Local\SaferVPN\OvpnConfig\.

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VyprVPN for Windows vulnerability

Advisory

Microsoft Windows Vulnerabilities

VyprVPN for Windows

VyprVPN for Windows suffers from a SYSTEM privilege escalation vulnerability through the VyprVPN service. This service establishes an NetNamedPipe endpoint that allows applications to connect and call publicly exposed methods.

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PureVPN for Windows vulnerability

Advisory

Microsoft Windows Vulnerabilities

PureVPN for Windows

PureVPN for Windows suffers from a SYSTEM privilege escalation vulnerability in its sevpnclient service. When configured to use the OpenVPN protocol, the sevpnclient service executes openvpn.exe using the OpenVPN config file located at C:\ProgramData\purevpn\config\config.ovpn.

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Private Internet Access VPN Client for Windows vulnerability

Advisory

Microsoft Windows Vulnerabilities

Private Internet Access VPN Client for Windows

A vulnerability in Private Internet Access VPN Client for Windows could allow an unauthenticated, local attacker to run executable files with elevated privileges. The vulnerability is due to insufficient implementation of the access controls.

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ProtonVPN for Windows vulnerability

Advisory

Microsoft Windows Vulnerabilities

ProtonVPN for Windows

ProtonVPN for Windows suffers from a SYSTEM privilege escalation vulnerability through the ProtonVPN Service. This service establishes an NetNamedPipe endpoint that allows arbitrary installed applications to connect and call publicly exposed methods.

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