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badchttp

badchttp is a small flask app that makes it easier to identify bad characters for buffer overflow exploitation. Created during my OSCP studies.

Usage

Simply run badchttp to start the app

curl -o chars.txt http://localhost:1337/x0a/x0d

Creates a sequential bytes string without \x0a and \x0d

If that the forward slash feels wrong the backslash should work too. Just make sure to include the initial forward slash after the port:

curl -o chars.txt http://localhost:5000/\x0a\x0d
demo.webm

Installation Method #1: pipx (Recommended)

It is recommended you use pipx to install badchttp. pipx will install badchttp in it's own virtual environment, and make it available in the global context, avoiding conflicting package dependencies and the resulting instability. First, install pipx using the following commands:

sudo apt install python3-venv
python3 -m pip install --user pipx
python3 -m pipx ensurepath

You will have to re-source your ~/.bashrc or ~/.zshrc file (or open a new tab) after running these commands in order to use pipx.

Install badchttp using the following command:

pipx install git+https://github.com/kwkeefer/badchttp.git

Installation Method #2: pip

Alternatively you can use pip to install badchttp using the following command:

python3 -m pip install git+https://github.com/kwkeefer/badchttp.git