Moanshop.7z [2025]

Overwriting settings in the rendering engine (like EJS or Pug) to force the server to execute malicious system commands. Summary of the Solution To solve the challenge, a researcher typically: Downloads and extracts the moanshop.7z file.

Identifies a vulnerable merge function in the cart.js or admin.js file.

Triggers a system command (e.g., cat /flag.txt ) to read the secret flag. moanshop.7z

The application uses a vulnerable library (like lodash or merge-deep ) to combine user input into a configuration object.

Issues in how the "shopping cart" or "payment" logic handles quantities or prices. 2. The Critical Flaw: Prototype Pollution Overwriting settings in the rendering engine (like EJS

The file is associated with a widely known and high-stakes Capture The Flag (CTF) challenge, typically categorized under Web Exploitation or Reverse Engineering .

An attacker sends a JSON payload containing the __proto__ key. This allows them to inject properties into the global object prototype, effectively changing the behavior of the entire application. 3. From Pollution to Remote Code Execution (RCE) Triggers a system command (e

Crafts a malicious POST request to pollute the server’s environment.