Flint – Web-based Firewall Rule Scanner

Keep on Guard!


Flint examines firewalls, quickly computes the effect of all the configuration rules, and then spots problems so you can:

  • CLEAN UP RUSTY CONFIGURATIONS that are crudded up with rules that can’t match traffic.
  • ERADICATE LATENT SECURITY PROBLEMS lurking in overly-permissive rules
  • SANITY CHECK CHANGES to see if new rules create problems.

Flint is absolutely free. There’s no catch. You can download the source from the git repository. This isn’t the “play at home” version; it’s their second product, and they want to do it open source.

Why You Need Flint

You have multiple firewalls protecting internal networks from the Internet and controlling access to customer data. Your business changes, and so do your firewalls, and not always at the same time. Firewalls can get out of step with policies.

Everybody makes mistakes. To understand a firewall configuration, you have to read hundreds of configuration lines, and then you have to think like a firewall does. People aren’t good at thinking like firewalls. So most firewalls are riddled with subtle mistakes. Some of those mistakes can be expensive:

  • INSECURE SERVICES might be allowed through the firewall, preventing it from blocking attacks.
  • LAX CONTROLS ON DMZs may expose staging and test servers.
  • FIREWALL MANAGEMENT PORTS may be exposed to untrusted networks.
  • REDUNDANT FIREWALL RULES may be complicating your configuration and slowing you down.

You can download Flint here:

VMWare Virtual Machine – FlintVM-current.zip
OVF Virtual Machine – FlintVM-current.ovf.zip
Source – flint-current.tgz

Or read more here.

Posted in: Countermeasures, Networking Hacking, Security Software

, , , ,


Latest Posts:


OWASP ZSC - Obfuscated Code Generator Tool OWASP ZSC – Obfuscated Code Generator Tool
OWASP ZSC is an open source obfuscated code generator tool in Python which lets you generate customized shellcodes and convert scripts to an obfuscated script.
A Look Back At 2017 – Tools & News Highlights A Look Back At 2017 – Tools & News Highlights
So here we are in 2018, taking a look back at 2017, quite a year it was. Here is a quick rundown of some of the best hacking/security tools released in 2017, the biggest news stories and the 10 most viewed posts on Darknet as a bonus.
Spectre & Meltdown Checker - Vulnerability Mitigation Tool For Linux Spectre & Meltdown Checker – Vulnerability Mitigation Tool For Linux
Spectre & Meltdown Checker is a simple shell script to tell if your Linux installation is vulnerable against the 3 "speculative execution" CVEs that were made public early 2018.
Hijacker - Reaver For Android Wifi Hacker App Hijacker – Reaver For Android Wifi Hacker App
Hijacker is a native GUI which provides Reaver for Android along with Aircrack-ng, Airodump-ng and MDK3 making it a powerful Wifi hacker app.
Sublist3r - Fast Python Subdomain Enumeration Tool Sublist3r – Fast Python Subdomain Enumeration Tool
Sublist3r is a Python-based tool designed to enumerate subdomains of websites using OSINT. It helps penetration testers and bug hunters collect and gather subdomains for the domain they are targeting.
coWPAtty Download - Audit Pre-shared WPA Keys coWPAtty Download – Audit Pre-shared WPA Keys
coWPAtty is a C-based tool for running a brute-force dictionary attack against WPA-PSK and audit pre-shared WPA keys.


One Response to Flint – Web-based Firewall Rule Scanner

  1. Winter March 30, 2010 at 6:04 pm #

    FlintVM-current.ovf.zip doesn’t appear to be a ovf file and doesn’t appear to have a ovf file in the archive.

    Am I missing something?