Furia

🐧 💻

Intro to Programming Languages

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Commands

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Command Arguments

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Command History

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The Root Path

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Absolute Paths

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Changing position

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Changing to an Absolute Path

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Relative Paths

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Cat

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Ls

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Ls All

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Find

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Piping Echo

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Piping Stdout

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Piping Stdin

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Start Here

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Using the Terminal

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Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

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Restarting Challenges

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Challenge Programs

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The Flag File

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Using Privileged Mode

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Persistent Home Directories - One

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Persistent Home Directories - Two

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Linux Luminarium

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Intro to Commands

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Intro to Arguments

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Command History

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The Root

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Program and absolute paths

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Position thy self

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Position elsewhere

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implicit relative paths, from /

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explicit relative paths, from /

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implicit relative path

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home sweet home

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cat: not the pet, but the command!

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catting absolute paths

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more catting practice

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grepping for a needle in a haystack

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comparing files

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listing files

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touching files

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removing files

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moving files

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copying files

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hidden files

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An Epic Filesystem Quest

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making directories

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finding files

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linking files

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Learning From Documentation

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Learning Complex Usage

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Reading Manuals

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Searching Manuals

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Searching For Manuals

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Helpful Programs

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Help for Builtins

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Matching with *

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Matching with ?

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Matching with []

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Matching paths with []

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Multiple globs

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Mixing globs

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Exclusionary globbing

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Tab completion

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Multiple options for tab completion

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Tab completion on commands

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Redirecting output

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Redirecting more output

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Appending output

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Redirecting errors

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Redirecting input

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Grepping stored results

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Grepping live output

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Grepping errors

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Filtering with grep -v

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Filtering with sed

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Duplicating piped data with tee

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Process substitution for input

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Writing to multiple programs

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Split-piping stderr and stdout

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Named pipes

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Printing Variables

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Setting Variables

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Multi-word Variables

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Exporting Variables

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Printing Exported Variables

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Storing Command Output

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Reading Input

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Reading Files

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Translating characters

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Deleting characters

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Deleting newlines

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Extracting the first lines with head

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Extracting specific sections of text

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Sorting data

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Listing Processes

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Killing Processes

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Interrupting Processes

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Killing Misbehaving Processes

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Suspending Processes

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Resuming Processes

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Backgrounding Processes

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Foregrounding Processes

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Starting Backgrounded Processes

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Process Exit Codes

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Becoming root with su

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Other users with su

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Cracking passwords

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Using sudo

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Changing File Ownership

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Groups and Files

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Fun With Groups Names

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Changing Permissions

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Executable Files

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Permission Tweaking Practice

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Permissions Setting Practice

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The SUID Bit

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Chaining with Semicolons

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Building on Success

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Handling Failure

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Your First Shell Script

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Redirecting Script Output

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Executable Shell Scripts

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Understanding Shebangs

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Scripting with Arguments

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Scripting with Conditionals

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Scripting with Default Cases

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Scripting with Multiple Conditions

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Reading Shell Scripts

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Launching Screen

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Detaching and Attaching

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Finding Sessions

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Switching Windows

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Detaching and Attaching (tmux)

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Switching Windows (tmux)

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The PATH Variable

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Setting PATH

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Finding Commands

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Adding Commands

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Hijacking Commands

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Bashrc Backdoor

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Sniffing Input

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Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

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Snooping on Configurations

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The Fork Bomb

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Disk-Space Doomsday

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rm -rf /

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Life after rm -rf /

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Finding meaning after rm -rf /

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Computing 101

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Your First Register

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Your First Syscall

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Exit Codes

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Building Executables

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Moving Between Registers

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Loading From Memory

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More Loading Practice

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Dereferencing Pointers

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Dereferencing Yourself

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Dereferencing with Offsets

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Stored Addresses

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Double Dereference

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The Stack

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Stack Offsets

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Program Arguments on the Stack

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Popping From the Stack

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Negative Numbers

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Negative Numbers (16-bit)

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Negative Numbers (32-bit)

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Encoding Negatives

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Binary and Hex Encoding

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More Hex

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Decoding Hex

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Mixed Conversions

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Disassembling Programs

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Tracing Syscalls

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Starting GDB

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Quitting GDB

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Starting Programs in GDB

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Disassembling in GDB

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Stepping Through Instructions

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Reading Register Values

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Setting Register Values

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Popping Stack Values

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Examining Memory

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Examining Stack Pointers

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Cooperative Debugging

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Running with Arguments

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Redirecting Input in GDB

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Writing Output

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Chaining Syscalls

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Writing Strings

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Reading Data

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Reading Exactly

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Opening Files

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Hardcoding the Filename

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RIP-Relative Strings

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Comparing Values

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Comparing Characters

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Conditional Control Flow

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Comparing Strings

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Reverse the Password

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Conditionals Without Conditionals

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Recognizing Loops

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Writing Loops

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Writing From a Shared Library

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Returning a Value

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Calling Through a Pointer

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Calling Through a Pointer with an Argument

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Saving Caller-Saved Registers

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Saving Callee-Saved Registers

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Sign Extension

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Little-Endian Bytes

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Qword by Qword

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Dword by Dword

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Word by Word

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Byte by Byte

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Cracking a Struct

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Scrambled Struct

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Reverse the Calculation

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Reverse the Reverse

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Dealing with Bitwise Operations

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Even or Odd

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Masking Bits

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Lowercase a String

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Uppercase a String

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Swap Case

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Shifting Left

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Shifting Right

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Loops on Data

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Reaching Into the Caller's Frame

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Loading Stale Stack Data

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Stealing Stale Stack Data

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Reserving Your Own Frame

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Using Your Own Frame

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Environment Variables on the Stack

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Aligning the Stack Through the Environment

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Aligning the Stack Through GDB

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Aligning the Stack Through GDB, Generalized

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A Single Digit

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Two Digits

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String to Integer

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Negative Numbers

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Where the Number Ends

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A Whole Program

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A Single Digit, Back to Text

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Divide and Remainder

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Drop the Leading Zero

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Integer to String

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Negative Numbers, Back to Text

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Sum Them All

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Addition

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Subtraction

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Multiplication

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Bitwise Operators

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Unary Operators

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Literal Output

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Newline Escapes

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Escaped Syntax

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Decimal Markers

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Multiple Decimal Markers

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String Markers

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Hex Byte Escapes

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Debugging Programs

Time of First Successful Submission: 2026-10-29 08:04:37

Inspecting Registers

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Examining Memory

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Setting Breakpoints

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GDB Scripting

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Modifying Data

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Modifying Execution

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Broken Functions

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Exit

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Socket

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Bind

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Listen

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Accept

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Static Response

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Dynamic Response

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Iterative GET Server

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Concurrent GET Server

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Concurrent POST Server

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Web Server

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Playing With Programs

113 / 116 1490 / 27342


What's the password?

Time of First Successful Submission: 2026-10-31 07:19:20

... and again!

Time of First Successful Submission: 2026-10-31 07:36:54

Newline Troubles

Time of First Successful Submission: 2026-10-31 07:41:29

Reasoning about files

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Specifying Filenames

Time of First Successful Submission: 2026-10-31 07:48:44

Binary and Hex Encoding

Time of First Successful Submission: 2026-10-31 08:01:51

More Hex

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Decoding Hex

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Decoding Practice

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Encoding Practice

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Hex-encoding ASCII

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Nested Encoding

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Hex-encoding UTF-8

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UTF Mixups

Time of First Successful Submission: 2026-10-31 15:23:13

Modifying Encoded Data

Time of First Successful Submission: 2026-10-31 15:35:50

Decoding Base64

Time of First Successful Submission: 2026-10-31 16:09:43

Encoding Base64

Time of First Successful Submission: 2026-10-31 16:17:48

Dealing with Obfuscation

Time of First Successful Submission: 2026-10-31 16:23:47

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-10-31 16:34:31

Your First HTTP Request

Time of First Successful Submission: 2026-10-31 18:17:01

Reading Flask

Time of First Successful Submission: 2026-10-31 18:31:43

Commented Data

Time of First Successful Submission: 2026-10-31 18:40:49

HTTP Metadata

Time of First Successful Submission: 2026-11-01 09:47:41

HTTP (netcat)

Time of First Successful Submission: 2026-11-01 10:08:35

HTTP Paths (netcat)

Time of First Successful Submission: 2026-11-01 10:15:41

HTTP (curl)

Time of First Successful Submission: 2026-11-01 10:21:22

HTTP (python)

Time of First Successful Submission: 2026-11-01 10:30:46

HTTP Host Header (python)

Time of First Successful Submission: 2026-11-01 10:49:32

HTTP Host Header (curl)

Time of First Successful Submission: 2026-11-01 11:00:23

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-11-01 11:18:23

URL Encoding (netcat)

Time of First Successful Submission: 2026-11-01 11:36:17

HTTP GET Parameters

Time of First Successful Submission: 2026-11-01 11:47:21

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-11-01 12:03:38

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-11-01 12:13:18

HTTP Forms

Time of First Successful Submission: 2026-11-01 12:24:53

HTTP Forms (curl)

Time of First Successful Submission: 2026-11-01 12:31:28

HTTP Forms (netcat)

Time of First Successful Submission: 2026-11-01 12:52:02

HTTP Forms (python)

Time of First Successful Submission: 2026-11-01 13:00:29

HTTP Forms Without Forms

Time of First Successful Submission: 2026-11-01 13:11:32

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-11-01 13:18:17

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-11-01 13:24:54

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-11-01 15:46:04

HTTP Redirects (curl)

Time of First Successful Submission: 2026-11-01 15:54:12

HTTP Redirects (python)

Time of First Successful Submission: 2026-11-01 15:59:39

HTTP Cookies (curl)

Time of First Successful Submission: 2026-11-01 16:06:07

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-11-01 16:12:44

HTTP Cookies (python)

Time of First Successful Submission: 2026-11-01 16:22:11

Server State (python)

Time of First Successful Submission: 2026-11-01 17:53:07

Listening Web

Time of First Successful Submission: 2026-11-01 18:11:54

Speaking Redirects

Time of First Successful Submission: 2026-11-01 21:57:39

JavaScript Redirects

Time of First Successful Submission: 2026-11-02 08:45:12

Including JavaScript

Time of First Successful Submission: 2026-11-02 09:14:52

HTTP (javascript)

Time of First Successful Submission: 2026-11-02 21:55:30

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-11-03 07:38:42

HTTP Forms (javascript)

Time of First Successful Submission: 2026-11-03 08:00:49

cat

Time of First Successful Submission: 2026-11-01 22:01:39

more

Time of First Successful Submission: 2026-11-01 22:02:16

less

Time of First Successful Submission: 2026-11-01 22:03:08

tail

Time of First Successful Submission: 2026-11-01 22:05:05

head

Time of First Successful Submission: 2026-11-01 22:05:31

sort

Time of First Successful Submission: 2026-11-01 22:05:51

vim

Time of First Successful Submission: 2026-11-01 22:06:49

emacs

Time of First Successful Submission: 2026-11-01 22:08:49

nano

Time of First Successful Submission: 2026-11-01 22:10:35

rev

Time of First Successful Submission: 2026-11-01 22:11:37

od

Time of First Successful Submission: 2026-11-01 22:16:03

hd

Time of First Successful Submission: 2026-11-01 22:17:58

xxd

Time of First Successful Submission: 2026-11-01 22:19:36

base32

Time of First Successful Submission: 2026-11-02 09:17:29

base64

Time of First Successful Submission: 2026-11-02 09:18:16

split

Time of First Successful Submission: 2026-11-02 11:23:12

gzip

Time of First Successful Submission: 2026-11-02 11:27:27

bzip2

Time of First Successful Submission: 2026-11-02 11:29:11

zip

Time of First Successful Submission: 2026-11-02 11:36:40

tar

Time of First Successful Submission: 2026-11-02 11:38:57

ar

Time of First Successful Submission: 2026-11-02 11:41:19

cpio

Time of First Successful Submission: 2026-11-02 11:50:25

genisoimage

Time of First Successful Submission: 2026-11-02 11:53:31

env

Time of First Successful Submission: 2026-11-02 12:05:32

find

Time of First Successful Submission: 2026-11-02 12:20:34

make

Time of First Successful Submission: 2026-11-02 12:29:02

nice

Time of First Successful Submission: 2026-11-02 12:32:19

timeout

Time of First Successful Submission: 2026-11-02 12:37:35

stdbuf

Time of First Successful Submission: 2026-11-02 12:39:28

setarch

Time of First Successful Submission: 2026-11-02 12:47:09

watch

Time of First Successful Submission: 2026-11-02 12:48:04

socat

Time of First Successful Submission: 2026-11-02 12:52:58

whiptail

Time of First Successful Submission: 2026-11-02 17:13:26

awk

Time of First Successful Submission: 2026-11-02 17:21:06

sed

Time of First Successful Submission: 2026-11-02 17:29:46

ed

Time of First Successful Submission: 2026-11-02 17:38:06

chown

Time of First Successful Submission: 2026-11-02 17:42:41

chmod

Time of First Successful Submission: 2026-11-02 17:44:00

cp

Time of First Successful Submission: 2026-11-02 17:48:38

mv

Time of First Successful Submission: 2026-11-02 20:32:38

perl

Time of First Successful Submission: 2026-11-02 20:37:04

python

Time of First Successful Submission: 2026-11-02 20:39:30

ruby

Time of First Successful Submission: 2026-11-02 20:47:18

bash

Time of First Successful Submission: 2026-11-02 20:48:30

date

Time of First Successful Submission: 2026-11-02 20:51:41

dmesg

Time of First Successful Submission: 2026-11-02 20:53:09

wc

Time of First Successful Submission: 2026-11-02 20:54:30

gcc

Time of First Successful Submission: 2026-11-02 21:13:47

as

Time of First Successful Submission: 2026-11-02 21:14:50

wget

Time of First Successful Submission: 2026-11-02 21:22:47

ssh-keygen

Time of First Successful Submission: 2026-11-02 21:26:01

SQL Queries

Time of First Successful Submission: 2026-11-03 08:08:14

Filtering SQL

Time of First Successful Submission: 2026-11-03 08:20:29

Choosing Columns

Time of First Successful Submission: 2026-11-03 08:23:51

Exclusionary Filtering

Time of First Successful Submission: 2026-11-03 08:30:35

Filtering Strings

Time of First Successful Submission: 2026-11-03 08:33:01

Filtering on Expressions

Time of First Successful Submission: 2026-11-03 08:37:13

SELECTing Expressions

Time of First Successful Submission: 2026-11-03 09:02:52

Composite Conditions

Time of First Successful Submission: 2026-11-03 10:01:55

Reaching Your LIMITs

Time of First Successful Submission: 2026-11-03 10:08:35

Querying Metadata

Time of First Successful Submission: 2026-11-03 10:19:28


DSU Cyber Camps

12 / 104 6337 / 75608


Using the Terminal

Time of First Successful Submission: 2026-10-18 14:14:45

Using the VSCode Workspace

Time of First Successful Submission: 2026-10-18 14:19:36

Using the GUI Desktop

Time of First Successful Submission: 2026-10-18 14:23:42

Pasting into the Desktop

Time of First Successful Submission: 2026-10-18 14:26:21

Connecting over SSH

Time of First Successful Submission: 2026-10-18 15:21:06

Restarting Challenges

Time of First Successful Submission: 2026-10-18 14:53:06

Getting Help

Time of First Successful Submission: 2026-10-18 14:58:05

Challenge Programs

Time of First Successful Submission: 2026-10-23 07:37:07

The Flag File

Time of First Successful Submission: 2026-10-23 07:38:23

Using Privileged Mode

Time of First Successful Submission: 2026-10-23 07:41:35

Persistent Home Directories - One

Time of First Successful Submission: 2026-10-23 07:49:13

Persistent Home Directories - Two

Time of First Successful Submission: 2026-10-23 07:49:59


GCA CTF

12 / 104 6337 / 75608


Using the Terminal

Time of First Successful Submission: 2026-10-18 14:14:45

Using the VSCode Workspace

Time of First Successful Submission: 2026-10-18 14:19:36

Using the GUI Desktop

Time of First Successful Submission: 2026-10-18 14:23:42

Pasting into the Desktop

Time of First Successful Submission: 2026-10-18 14:26:21

Connecting over SSH

Time of First Successful Submission: 2026-10-18 15:21:06

Restarting Challenges

Time of First Successful Submission: 2026-10-18 14:53:06

Getting Help

Time of First Successful Submission: 2026-10-18 14:58:05

Challenge Programs

Time of First Successful Submission: 2026-10-23 07:37:07

The Flag File

Time of First Successful Submission: 2026-10-23 07:38:23

Using Privileged Mode

Time of First Successful Submission: 2026-10-23 07:41:35

Persistent Home Directories - One

Time of First Successful Submission: 2026-10-23 07:49:13

Persistent Home Directories - Two

Time of First Successful Submission: 2026-10-23 07:49:59