CVE-2024-38537 PoC — Inclusion of Untrusted polyfill.io Code Vulnerability in fides.js

Source

https://github.com/Havoc10-sw/Detect_polyfill_CVE-2024-38537-

Associated Vulnerability

Title: Inclusion of Untrusted polyfill.io Code Vulnerability in fides.js (CVE-2024-38537)
Description:Fides is an open-source privacy engineering platform. `fides.js`, a client-side script used to interact with the consent management features of Fides, used the `polyfill.io` domain in a very limited edge case, when it detected a legacy browser such as IE11 that did not support the fetch standard. Therefore it was possible for users of legacy, pre-2017 browsers who navigate to a page serving `fides.js` to download and execute malicious scripts from the `polyfill.io` domain when the domain was compromised and serving malware. No exploitation of `fides.js` via `polyfill.io` has been identified as of time of publication. The vulnerability has been patched in Fides version `2.39.1`. Users are advised to upgrade to this version or later to secure their systems against this threat. On Thursday, June 27, 2024, Cloudflare and Namecheap intervened at a domain level to ensure `polyfill.io` and its subdomains could not resolve to the compromised service, rendering this vulnerability unexploitable. Prior to the domain level intervention, there were no server-side workarounds and the confidentiality, integrity, and availability impacts of this vulnerability were high. Clients could ensure they were not affected by using a modern browser that supported the fetch standard.

Description

Here's a Python script that checks if the polyfill.io domain is present in the Content Security Policy (CSP) header of a given web application.

Readme

# Detect_polyfill_CVE-2024-38537
Here's a Python script that checks if the polyfill.io domain is present in the Content Security Policy (CSP) header of a given web application.
  Steps:
  1.Save the modified script (check_csp_from_file.py) in the same directory as your urls.txt file.
  2.Run the script using python check_csp_from_file.py.
  3.The script will read each URL from urls.txt, fetch the CSP headers, and check if polyfill.io is allowed in each URL's CSP header.

File Snapshot

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