Quick Tutorial: firmwalker tool for Firmware Analysis
Firmwalker is a tool written in a bash script and it is used for analyzing the file system of extracted or mounted firmware.
You can install a firmwalker tool by using the one-liner command:
git clone https://github.com/scriptingxss/firmwalker.git
What is the output of firmwalker?
firmwalker provides you quick initial results to initiate security assessment of firmware.
- may give sensitive details by searching keywords such as admin, remote, password etc.
- may give .bin, script, configuration files
- may give IP addresses, email IDs, URLs, etc.
- may give details for etc/shadow, etc/passwd and etc/ssl directories
- may give SSL-related files such as .pem, .crt etc.
How to run firmwalker?
This tool can be run against the filesystem of extracted or mounted firmware. For testing purposes, clone the repository of IoTGoat, an intentionally vulnerable firmware developed by the OWASP community.
git clone https://github.com/OWASP/IoTGoat.git
Now, you can run firmwalker against the filesystem of downloaded IoTGoat
It will search admin, admin pattern, root etc.
Search for the private key
Search for URLs, IP, and email addresses
firmwalker is a great automation tool (or more precisely bash script) to start the assessment of firmware. Although, you need to go through reports and analyze results manually to identify more vulnerabilities.
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Disclaimer: This tutorial is for educational purpose only. Individual is solely responsible for any illegal act.