Moanshop.7z -

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.

Admin panels or debugging routes not visible in the UI.

Injecting an isAdmin: true property into the prototype so that every user session is treated as an administrator.

In this challenge, participants are presented with a compressed archive ( .7z ) containing the source code for a fictional online storefront called "Moan Shop." The objective is to identify and exploit vulnerabilities within the application to retrieve a hidden "flag"—a specific string of text that proves the system was successfully breached.

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

Once the attacker can "pollute" the global object, they target specific application behaviors to gain control:

While the exact details can vary depending on the specific competition (e.g., SECCON, HTB, or private bug bounty simulations), the typical write-up for this challenge focuses on three main stages:

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