fenrir
A penetration testing tool that bypasses wired 802.1x network protection to gain access to target networks.
What is fenrir?
FENRIR is a penetration testing tool specifically designed to bypass wired 802.1x network protection mechanisms. It enables security professionals to gain unauthorized access to target networks during offensive engagements by tapping authentication protocols and spoofing legitimate network traffic. The tool provides an interactive interface with autoconfiguration capabilities for rapid deployment in security assessments.
Penetration testers, red teamers, and offensive security professionals who need to bypass network access controls during security assessments. Also suitable for security researchers studying 802.1x vulnerabilities and bypass techniques.
FENRIR offers a specialized, out-of-the-box solution for bypassing wired 802.1x protections that many general-purpose penetration testing tools lack. Its modular architecture allows for extensible protocol support, and its autoconfiguration feature enables quick deployment during time-sensitive engagements.
Overview
FENRIR is an out-of-the-box tool designed for penetration tests and offensive security engagements. Its primary purpose is to bypass wired 802.1x network access control (NAC) protections, allowing testers to gain unauthorized access to a target network for security assessment.
Key Features
- 802.1x Bypass — Taps and bypasses wired 802.1x authentication mechanisms to access protected networks.
- Autoconfiguration — Automatically configures network settings for quick deployment during engagements.
- Protocol Modules — Supports IP, ARP, ICMP, and partially LLMNR/NBNS (Responder) with plans for SSH and SMB.
- Runtime Interface — Provides an interactive command-line interface with autocompletion and shell command execution.
- Stealth Capabilities — Includes partial stealth features to avoid detection by network monitoring systems.
- Reverse Connections — Enables reverse connection capabilities for maintaining access (currently being reworked).
Philosophy
FENRIR prioritizes practical, out-of-the-box usability for penetration testers, with a focus on bypassing network protections efficiently while maintaining an extensible module-based architecture for future protocol support.
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