Local Privilege Escalation via OpenVPN Configuration and Proxy Settings in Securepoint SSL VPN Client v2 for Windows

Overview

Securepoint SSL VPN Client v2 on Windows contains vulnerabilities in the handling of OpenVPN configurations and proxy settings that allow non-privileged local users to influence operations performed with NT AUTHORITY\SYSTEM privileges.

Two attack vectors have been identified:

Improper authorization of configuration checksum updates: The privileged service does not properly validate the authorization of connecting clients when updating the checksum of an OpenVPN configuration. This allows a non-privileged local user to modify an OpenVPN configuration and set a valid checksum without administrator privileges. The modified configuration is subsequently processed with NT AUTHORITY\SYSTEM privileges.

Argument injection via proxy settings: The client does not properly validate or sanitize proxy settings before passing them as arguments to OpenVPN. A non-privileged local user can inject additional arguments through the proxy settings, influencing the execution of OpenVPN with NT AUTHORITY\SYSTEM privileges. This attack vector does not require direct communication with the privileged service or modification of the protected OpenVPN configuration.

Affected

• ssl_vpn_client_v2 >= 1.0.2 < 2.0.50

Remediation

Upgrade Securepoint SSL VPN Client v2 to 2.0.50 or newer.