CVE-2023-43804 PoC — `Cookie` HTTP header isn't stripped on cross-origin redirects

Source

https://github.com/JawadPy/CVE-2023-43804-Exploit

Associated Vulnerability

Title:`Cookie` HTTP header isn't stripped on cross-origin redirects (CVE-2023-43804)
Description:urllib3 is a user-friendly HTTP client library for Python. urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.

Description

Example of how CVE-2023-43804 works with real python code.

Readme

# PoC
Example of how CVE-2023-43804 works with real python code.


Explaining `CVE-2023-43804/server.py` and `CVE-2023-43804/example.py`

In `server.py` I created a simple website that redirects you to google.com, so make sure to run `server.py` first before trying `example.py`.

In `example.py` I added a cookie to the request header, so when you try to request `http://127.0.0.1:5000/` (it's a local website we created via `python server.py`) you will be redirected to google.com, after that when reading `Cookies` you will find that your cookies been redirected too to be with your cookies on google.com.


This bug is fixed on URLLIB3 2.0.6, having any older version may expose to attackers.

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File Snapshot


 [4.0K]  /data/pocs/c08db123b150a6e255abfd89b57a06d488cb84a7
├── [4.0K]  CVE-2023-43804
│   ├── [ 605]  example.py
│   └── [ 232]  server.py
└── [1.1K]  README.md

1 directory, 3 files

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