Bash PIN

EasyBash

Overview

I’m using a script located at `/challenge/chall.sh` to manage the server. It requires `sudo` privileges because it performs several operations that need high-level access like `sudo /challenge/chall.sh`. The script is currently protected by a password prompt. Is there a way to bypass the password prompt ?
Flag Format: Flag{}

Lab Details

Prerequisites & Requirements

  • Basic understanding of Bash scripting and shell commands
  • Knowledge of variable handling and arithmetic operations in Bash
  • Understanding of how Bash evaluates expressions in different contexts
  • Familiarity with authentication bypass techniques
  • Basic understanding of variable naming conventions in shell scripting

What will you learn?

  • How Bash handles variable evaluation in arithmetic contexts
  • The difference between string comparison and arithmetic comparison in Bash
  • Variable name exploitation techniques in shell scripting
  • How improper input validation can lead to authentication bypass
  • The importance of proper input sanitization in security-critical applications
  • Understanding the behavior of (( )) arithmetic evaluation in Bash

Tools

  • Terminal / Shell: For executing the challenge script
  • Text Editor: For analyzing the source code

Job Positions

Tags

Bash PitfallsBash ScriptingShellPermissionsRoot Access