gau VS trivy

Learn more about gau here: https://github.com/lc/gau

I see people use tools like gau and waybackurls when doing recon and analysis before a web app pentest, I am a complete beginner and most tutorials just explain how to install these tools but not why we want to use them or where we want to get using them.

Great :) Would be a great addition to tools like gau or waybackurls for people with an API key!

4. Trivy: https://github.com/aquasecurity/trivy Trivy is a versatile tool that scans for vulnerabilities in your containers, and also checks for vulnerabilities in your application dependencies.

Trivy Owner/Maintainer: Aqua Security Age: First released on GitHub on May 7th, 2019 License: Apache License 2.0 backward-compatible with tfsec

Trivy. A Simple and Comprehensive Vulnerability Scanner for Containers.

Using Trivy:

Trivy is a mature and comprehensive open source tool from Aqua Security that supports scanning multiple sources, from file systems to containers and VMs. Trivy also looks beyond vulnerabilities, to scan licenses, secrets, infrastructure as code misconfiguration, and more.

I would suggest to think about the thread model that you are facing so you can have a better mental model of the weak points of your environment. The very very big majority of these attacks will be automated probing for publicly known vulnerabilities or default credentials. That means the maintainers of the software you are running and the channels on which their updates are shipped to you and deployed are very important factors. For software that is not installed from a trusted and well maintained source (e.g. Ubuntus main repository), you want to make extra sure that vulnerabilities are updated. E.g. your deployed docker containers might contain security issues, you can run checks on these with tools like trivy. The same is also true for appliances, in case your router or firewall contains a software vulnerability, how will you be notified and how will the required updates be deployed?