Windscribe for Linux 'changeMTU' local privilege escalation

A command injection vulnerability exists in Windscribe for Linux Desktop App that allows a local user who is a member of the windscribe group to execute arbitrary commands as root via the 'adapterName' parameter of the 'changeMTU' function. Fixed in Windscribe v2.18.3-alpha and v2.18.8.

This vulnerability allows local attackers to escalate privileges on affected installations of Windscribe. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the configuration of OpenSSL. The product loads an OpenSSL configuration file from an unsecured location. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-16859.

All versions of Windscribe VPN for Mac and Windows <= v2.02.10 contain a local privilege escalation vulnerability in the WindscribeService component. A low privilege user could leverage several openvpn options to execute code as root/SYSTEM.

In Windscribe v1.83 Build 20, 'WindscribeService' has an Unquoted Service Path that facilitates privilege escalation.

The VPN component in Windscribe 1.81 uses the OpenVPN client for connections. Also, it creates a WindScribeService.exe system process that establishes a \\.\pipe\WindscribeService named pipe endpoint that allows the Windscribe VPN process to connect and execute an OpenVPN process or other processes (like taskkill, etc.). There is no validation of the program name before constructing the lpCommandLine argument for a CreateProcess call. An attacker can run any malicious process with SYSTEM privileges through this named pipe.

Windscribe 1.81 creates a named pipe with a NULL DACL that allows Everyone users to gain privileges or cause a denial of service via \\.\pipe\WindscribeService.

Windscribe Directory Traversal Local Privilege Escalation Vulnerability

Windscribe Directory Traversal Local Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Windscribe. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the Windscribe Service. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-23441.