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Abstract

  • Using the famous zip bomb concept (Silicon Valley S3E07), we can send a compressed web-page to the client.
  • The browser will unzip the small compressed page into a very big file, potentially crashing it.
  • This aims to disrupt or crash bots that scan websites to find vulnerabilities.

tldr - Python GZIP-Bomb HTTP Server

GZip HTTP Bombing in Python for everyone.

Uses Python Flask framework

Docker friendly

It even has it's own low effort logo.

Please keep in mind this is a counter-measure.

Based on this excellent piece by Christian Haschek

Flask Bomb

This repository contains the necessary files to:

  • Host a quick & dirty Flask web server that responds to web requests with a GZip archive as a response page.

  • The recommended way to use FlaskBomb is by deploying it with Docker. You can try it here:
    Try with Play-with-Docker

Features:

  • Quick and easy
  • Fast deployment using Docker
  • Lightweight Alpine based Docker container
  • Generic code
    • Implement your own rules or payloads !
  • (next)User-Agent evasion based on original work
  • Choose classic payload generation or faster append generation method

Usage:

docker run -it -p 80:5000 khanon/flaskbomb <normal|fast> <X> # X is the final payload's size in GB  
# Example:  
docker run -it -p 80:5000 khanon/flaskbomb fast 20

Default deployment sets options to normal 1

Demo - 20G Payloads

Standard docker build from git, demo with cURL

asciicast

Standard deploy from docker hub, demo with Nikto

asciicast

Details & Notes

  • Gzip's algorithm enables the possibility to append archives
    • normal method generates the payload in one single dd command
    • fast method generates a 1GB payload and appends itself n times. The final payload is bigger but generates much faster.
  • Python 3
  • Since this uses Flask's built-in web server, internal port is 5000
  • The payload is generated using gzip and dd on Docker entrypoint.
    • *NIX based for now
    • Full python payload is up for next release
  • Flask development server is used. It is recommended to deploy the application on a WGSI + HTTPD
  • For those not using docker, generate the payload using the bash commands in entrypoint.sh and save it as ./static/cake.gzip
    • The python GZip implementation should make this easier in the future

Roadmap

  • Evasion
  • Python gzip implementation
  • Load evasion URIs from DirBuster
  • Fingerprinting JS before payload delivery