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taviso/ctftool

Free

Interactive CTF Exploration Tool

FreeFree tier
Type
Open Source
Visit Website GitHub (38 stars)

About taviso/ctftool

ctftool is an interactive command-line tool for experimenting with the CTF protocol, a lesser-known Windows protocol used to implement Text Services. It enables users to study Windows internals, debug complex issues with Text Input Processors, and analyze Windows security. The tool supports scripting for automating interactions with CTF clients or servers and can perform simple fuzzing. It has been tested on Windows 7, 8, and 10 (both 32-bit and x64), with more extensive testing on x64. Commands include connecting to CTF ALPC ports, querying server information, enumerating clients, marshalling parameters, and more. The project is open-source and hosted on GitHub.

Key Features

Interactive command-line interface for CTF protocol exploration
Scripting support for automating CTF client/server interactions
Simple fuzzing capabilities for CTF protocol
Supports Windows 7, 8, 10 (32-bit and x64)
Commands: connect, scan, callstub, createstub, hijack, sendinput, marshal, patch, and more
Online help available for all commands
Open-source project on GitHub (MIT license implied)

Pros & Cons

Pros
  • Open-source and free to use
  • Interactive shell with comprehensive command set
  • Supports scripting for automation
  • Works across multiple Windows versions
  • Useful for low-level Windows security research
Cons
  • Limited to Windows operating systems
  • Requires familiarity with Windows CTF protocol and low-level system concepts
  • Not a general-purpose tool; niche use case
  • Documentation is primarily the README and command help

Best For

Studying Windows internals and the CTF protocolDebugging and analyzing Windows Text Input ProcessorsWindows security research and vulnerability analysisAutomating CTF client/server interactions via scriptsFuzzing CTF protocol components

FAQ

What is CTF?
CTF is a little-known protocol used on Windows to implement Text Services, such as input method editors and text processing.
What is ctftool?
ctftool is an interactive command-line tool designed to explore and experiment with the CTF protocol on Windows.
What operating systems does ctftool support?
It has been tested on Windows 7, Windows 8, and Windows 10. Both 32-bit and x64 versions are supported, with more extensive testing on x64.
Can ctftool be used for scripting?
Yes, it is possible to write simple scripts for automating interaction with CTF clients or servers.
Where can I find more background information?
A blog post accompanying the release is available at the Google Project Zero blog: https://googleprojectzero.blogspot.com/2019/08/down-rabbit-hole.html