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bug_bounty

Nov 13, 2024, 3 min read

Here is the process I have been attempting in BugCrowd.

Create Automation Tool

The first step is to create a tool that will allow me to attack targets and generate a report I can submit to BugCrowd.

Features

  • Scans are driven by .yaml files
  • Control over
    • What attacks to conduct
    • What subdomains to target
  • Custom reports per attack/per target

I want to be able to work on an attack, code it, add test it against any number of targets. If the attack is successful, then generate a report, and finally submit it to the Bug Bounty program.

Folder Structure

  • \config
    • holds yaml file that controls scan execution
  • \modules
    • contains all of the custom attacks (.py files)
  • \reporting
    • contains all of the custom reporting code (.py files)
  • \results
    • contains reports of successful attacks (.txt files)
  • \targets
    • holds the yaml files of our targets
  • main.py
    • contains the core functionality to process yaml, run attacks on targets, and call reporting code

Target yaml file

Keeping the targets in a separate file allows me to control what I attack, the methods of attack, and allows custom reporting.

  • Challenges
    • Making changes to a large number of yaml files
      • TO DO: I need add command line functionality to make changes in bulk to the yaml files
meta:
  company: ABC
  url: https://www.abc.com
  scope: >
    Any domain/property of ABC not listed in the targets section is out of scope. 
    This includes any/all subdomains not specifically listed.
 
subdomains:
  - abc.com
  - api.abc.com
 
modules:
  - name: run_custom_attack
    reporting_function: run_reporting_function

Config file

This is a sample of the file that help me control scan execution runs. It is pretty basic but it allows me to run tests on a small population and allows me to run scans on all targets pretty seamless.

run_options:
  targets:
    - specific: ['abc.yaml']  # Specify specific target(s) to run
    - all: false  # Do not run all targets
  functions:
    - specific: ['run_custom_attack']  # Specify specific functions to run
    - all: false  # Do not run all functions

Enumeration

The simple target will tell you exactly what subdomain you can target. I simply copy/paste that into a yaml file and it is added to the rotation of subdomains to attack. But there are those that will tell you that any url in a certain subdomain is available to be attacked. This means we need to enumerate and identify all those subdomains.

  • https://crt.sh
    • This website lets you search a domain and it will return a bunch of subdomains
  • sublist3r (via Kali)
    • Does a pretty good job at finding the subdomains via command line
    • Strategy
      • Do a search with 1st level domain
        • abc.com
      • Do additional search for 2nd level domains
        • qa.abc.com
      • Do additional search for 3rd level domains
        • dev.qa.abc.com
      • Repeat until you run out of new results from sublist3r
    • WARNING
      • After a while, you will start to get blocked from the websites (i.e. Google) used by sublist3r to get the subdomains. This just means you will need to take a break of a few days and continue enumerating

Upkeep

  • Bad subdomains
    • You will get a good number of subdomains from your enumeration that you cannot ping/reach/scan and I recommend you just eliminate these from your attacks
    • I have a module that specifically flags bad subdomains and I remove those manually (for now) from my yaml target files.

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