Inside The Mind Of A Fortinet Award Winner: A Technical Deep Dive Into Responsible Disclosure And Product Security + Video

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Introduction:

The recent recognition of Thomas SAUTIER, CEO and Founder of SamHan, with a Fortinet Product Security Recognition Award underscores a critical but often overlooked aspect of cybersecurity: proactive, deep-dive product analysis. Beyond simply deploying firewalls, true expertise lies in dissecting the architectures of security tools themselves. This article extracts the technical methodology behind such recognition, providing a blueprint for security professionals to move from “integration” to “challenging” systems, focusing on attack surface analysis, logical flaw identification, and the responsible disclosure process.

Learning Objectives:

  • Understand the structured methodology for conducting deep-dive security audits on network appliances like Fortinet products.
  • Learn to identify weak implementations and bypass conditions in security mechanisms.
  • Master the technical steps and communication protocols involved in a responsible disclosure process with vendors.
  • Acquire practical Linux/Windows commands and tool configurations for testing authentication flows and network controls.

You Should Know:

1. Reconnaissance and Attack Surface Mapping

Before finding a vulnerability, you must understand what you are attacking. This involves a granular analysis of the architecture, network flows, and component interactions mentioned in the post.

Step‑by‑step guide: Mapping the Digital Terrain

  1. Firmware Analysis: Obtain the firmware image for the target device (e.g., a FortiGate firewall). Use `binwalk` on Linux to extract the filesystem. 
    Linux command to extract firmware
binwalk -e fortigate_firmware.out
cd _fortigate_firmware.out.extracted/
  2. Service Enumeration: Identify listening services. If you have a test device, scan it. If analyzing an image, check init scripts and configuration files. 
    Simulate network scanning against a test device
nmap -sS -sV -p- <target_ip>  Stealth SYN scan with version detection on all ports
  3. Web UI/API Analysis: Most modern firewalls have a web interface. Use browser developer tools (F12) to monitor API calls. Proxy the traffic through Burp Suite to analyze requests and responses for exposed endpoints or information leakage.

2. Logical and Behavioral Review of Security Mechanisms

This step moves beyond automated scanning to human-led analysis of how the security features actually behave under stress or unexpected input.

Step‑by‑step guide: Fuzzing Authentication and Controls

  1. Authentication Bypass Testing: Attempt to force unexpected states.

– Parameter Modification: Using Burp Suite, intercept a login request. Change the `POST` body or cookies (e.g., `admin=0` to admin=1).
– Session Handling: Access restricted pages directly via URL (forced browsing) to see if the backend properly validates session state on every request.
2. State Confusion: If the device has fail-open mechanisms (common in high-availability setups), test what happens when an authentication server becomes unreachable.

 Simulate network disruption to an LDAP/Radius server (if you control the network)
 On Linux, block traffic to the auth server using iptables
sudo iptables -A OUTPUT -d <auth_server_ip> -j DROP
 Then attempt to authenticate to the firewall to see if it fails open or closed.

3. Identifying Weak Implementations and Bypass Conditions

The award specifically mentions “identification de conditions de contournement” (bypass conditions). This involves logic flaws, such as race conditions or improper input sanitization.

Step‑by‑step guide: Exploiting Logic Flaws

  1. Input Validation: If the device has a CLI, test for command injection. 
    If a ping diagnostic tool exists on the GUI, try injecting commands
Input: 8.8.8.8; ls -la
Use Burp Suite to encode this payload and see if the system returns directory listings.

2. Access Control Flaws (Privilege Escalation):

  • Create a low-privileged user on the device.
  • Intercept the API requests made by the admin interface.
  • Replay those admin-level API requests using the low-privileged user’s session cookie. If the device only checks authentication and not authorization, you have a bypass.
  1. Cryptographic Failures: Check how sensitive data is stored in configuration backups. 
    Download a system config backup.
Use strings and grep on Linux to look for plaintext passwords or keys.
strings config_backup.conf | grep -i "password"

4. The Responsible Disclosure Workflow

Once a vulnerability is confirmed, the process moves to “communication coordonnée.” This is critical to getting a CVE and recognition like the Fortinet award.

Step‑by‑step guide: Coordinated Disclosure

  1. Documentation: Create a Proof of Concept (PoC). This should be a clear, step-by-step document (PDF) showing the vulnerable component, the exact payload, and the impact.
  2. Vendor Contact: Find the vendor’s security contact (usually `security@ 
    .com` or a bug bounty page). For Fortinet, this is the Fortinet Product Security Incident Response Team (PSIRT).</li>
</ol>

<h2 style="color: yellow;">3. Encrypted Communication: Encrypt your communication.</h2>

[bash]
 Download the vendor's PGP key from their security page.
 Encrypt your vulnerability report.
gpg --import vendor_public_key.asc
gpg --output report.pdf.gpg --encrypt --recipient [email protected] report.pdf

    4. Timeline Negotiation: Agree on a disclosure date (usually 90 days) to allow the vendor to patch the issue before it becomes public knowledge.

    5. Tooling for Deep Component Interaction Analysis

    To understand “interactions entre composants,” you must monitor internal communication.

    Step‑by‑step guide: Dynamic Analysis

    1. Debugging: If it’s a Linux-based appliance, try to enable debugging modes. Often hidden CLI commands exist. 
      Hypothetical FortiGate CLI command to enable debug (requires admin access on test device)
diagnose debug enable
diagnose debug application httpsd -1  Verbose logging for the web server daemon
    2. System Call Tracing: If you have root access in a lab environment, use `strace` to see what a specific process does when triggered. 
      Find the PID of the process (e.g., the SSL VPN process)
ps aux | grep sslvpnd
Trace all system calls for that PID
sudo strace -p <PID> -o /tmp/sslvpnd_trace.log

    6. Post-Disclosure: Validation and Hardening

    Once the vendor releases a patch, the security researcher validates the fix. From the post’s perspective, this is where “SamHan” brings “expertise réellement différenciante”—knowing exactly what was wrong and ensuring the fix is robust.

    Step‑by‑step guide: Patch Analysis

    1. Version Diffing: Download the patched firmware and the old firmware. Use `binwalk` to extract both and use a diffing tool like `meld` or `vimdiff` on Linux to compare the source code (if available) or binary files to see exactly how the vendor fixed the issue.
    2. Regression Testing: Re-run your original exploit against the patched version to ensure it is mitigated and that the patch did not break adjacent functionality.

    What Undercode Say:

    • Depth over Compliance: The award highlights that real security value comes from “challenging systems” and understanding architectures, not just checking compliance boxes. This requires a developer’s mindset applied to defensive tools.
    • The Professional Hunter: Responsible disclosure is a structured, professional activity requiring technical depth (Linux, network protocols) and soft skills (negotiation, documentation). It bridges the gap between offensive research and defensive product improvement.

    Prediction:

    The line between security product vendor and security researcher will continue to blur. As products become more complex (SASE, ZTNA), we will see a rise in “inter-component” vulnerabilities—flaws arising not from a single code block, but from the complex handshakes between cloud dashboards, on-prem appliances, and mobile agents. Awards like this will become a key differentiator for MSSPs seeking to prove their technical superiority in a crowded market, shifting focus from “what tools they use” to “how deeply they understand those tools.”

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