restricted repl

MediumBash

Overview

This is my restricted REPL. Can you execute `flag_bin`? The `flag_bin` binary is located at a random path.

Flag Format: Flag{}

Lab Details

Prerequisites & Requirements

  • Basic understanding of Linux/Unix command line
  • Familiarity with bash scripting
  • Knowledge of ASCII encoding systems
  • Understanding of shell variables and expansions

What will you learn?

  • Bypassing character restrictions in shell environments
  • Exploiting shell injection with non-alphanumeric characters
  • Using bash arithmetic and indirect variable expansion
  • Converting commands to octal ASCII representations
  • Crafting advanced shell injection payloads

Tools

  • Python 3 (for payload generation)
  • Basic Linux utilities

Job Positions

Penetration Tester

Tags

Bash ScriptingShellBash GlobbingRedirectionEnvironment Variables