Zero-Day Advisory

Fortinet Discovers TorGuard's Tomato Router Setup Tool for Windows DLL PreLoading Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered a DLL preloading vulnerability in TorGuard VPN Tomato Setup for Windows.

TorGuard VPN Tomato Setup for Windows is the custom setup for TorGuard Tomato Routers used to protect a user's identity and personal privacy using their anonymous VPN, proxy & email encryption services. It allows users to anonymize all their online activities.

TorGuard VPN Tomato Setup for Windows is susceptible to a DLL preloading vulnerability. The issue occurs when the application looks to load a DLL for execution and an attacker provides a malicious DLL to use instead. The application generally follows a specific search path to locate the DLL. The vulnerability can be exploited by a simple file write (or potentially an over-write) which results in a foreign DLL running under the context of the application.


Solutions

Users should apply the solution provided by TorGuard.

Timeline

Fortinet reported the vulnerability to TorGuard on May 14, 2018

TorGuard confirmed the vulnerability on May 15, 2018.

TorGuard patched the vulnerability on May 15, 2018.


Acknowledgement

This vulnerability was discovered by Kushal Arvind Shah of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.