BrianBeers

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-01-12 15:23:33

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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Intro to Cybersecurity

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Path Traversal 1

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Path Traversal 2

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CMDi 1

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CMDi 2

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CMDi 3

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CMDi 4

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CMDi 5

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Authentication Bypass 1

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Authentication Bypass 2

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SQLi 1

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SQLi 2

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SQLi 3

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SQLi 4

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SQLi 5

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XSS 1

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XSS 2

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XSS 3

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XSS 4

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XSS 5

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XSS 6

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XSS 7

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CSRF 1

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CSRF 2

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CSRF 3

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CSRF 4

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File Formats: Magic Numbers (Python)

Time of First Successful Submission: 2026-03-15 22:17:02

File Formats: Magic Numbers (C)

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File Formats: Magic Numbers (x86)

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Reading Endianness (Python)

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Reading Endianness (C)

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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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Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-01-12 15:23:33

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

Time of First Successful Submission: 2026-01-20 16:36:12

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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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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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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Writing Output

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Chaining Syscalls

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Writing Strings

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Reading Data

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Opening Files

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Hardcoding the Filename

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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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Looping

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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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Loops on Data

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set-register

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set-multiple-registers

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add-to-register

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linear-equation-registers

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integer-division

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modulo-operation

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set-upper-byte

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efficient-modulo

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byte-extraction

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bitwise-and

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check-even

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memory-read

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memory-write

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memory-increment

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byte-access

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memory-size-access

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little-endian-write

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memory-sum

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stack-subtraction

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swap-stack-values

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average-stack-values

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absolute-jump

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relative-jump

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jump-trampoline

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conditional-jump

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indirect-jump

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average-loop

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count-non-zero

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string-lower

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most-common-byte

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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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Debugging Programs

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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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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-01-23 01:54:25

... and again!

Time of First Successful Submission: 2026-01-23 02:01:34

Newline Troubles

Time of First Successful Submission: 2026-01-23 02:31:41

Reasoning about files

Time of First Successful Submission: 2026-01-23 04:14:19

Specifying Filenames

Time of First Successful Submission: 2026-01-23 07:27:30

Binary and Hex Encoding

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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: 2026-01-27 04:40:45

Modifying Encoded Data

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Decoding Base64

Time of First Successful Submission: 2026-02-02 21:04:44

Encoding Base64

Time of First Successful Submission: 2026-02-02 21:16:40

Dealing with Obfuscation

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Dealing with Obfuscation 2

Time of First Successful Submission: 2026-02-02 23:02:34

Your First HTTP Request

Time of First Successful Submission: 2026-02-06 02:37:27

Reading Flask

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Commented Data

Time of First Successful Submission: 2026-02-06 02:49:46

HTTP Metadata

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HTTP (netcat)

Time of First Successful Submission: 2026-02-07 23:42:22

HTTP Paths (netcat)

Time of First Successful Submission: 2026-02-07 23:47:50

HTTP (curl)

Time of First Successful Submission: 2026-02-07 23:53:03

HTTP (python)

Time of First Successful Submission: 2026-02-08 00:29:06

HTTP Host Header (python)

Time of First Successful Submission: 2026-02-08 01:02:00

HTTP Host Header (curl)

Time of First Successful Submission: 2026-02-08 18:32:36

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-02-08 18:40:53

URL Encoding (netcat)

Time of First Successful Submission: 2026-02-08 18:46:05

HTTP GET Parameters

Time of First Successful Submission: 2026-02-08 19:00:10

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-02-08 19:03:46

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-02-08 19:07:30

HTTP Forms

Time of First Successful Submission: 2026-02-08 19:10:26

HTTP Forms (curl)

Time of First Successful Submission: 2026-02-08 19:16:37

HTTP Forms (netcat)

Time of First Successful Submission: 2026-02-08 19:31:03

HTTP Forms (python)

Time of First Successful Submission: 2026-02-08 19:40:45

HTTP Forms Without Forms

Time of First Successful Submission: 2026-02-08 20:09:13

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-02-08 20:15:15

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-02-09 22:07:13

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-02-09 22:18:47

HTTP Redirects (curl)

Time of First Successful Submission: 2026-02-09 22:22:21

HTTP Redirects (python)

Time of First Successful Submission: 2026-02-09 22:31:57

HTTP Cookies (curl)

Time of First Successful Submission: 2026-02-09 23:20:33

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-02-12 23:44:39

HTTP Cookies (python)

Time of First Successful Submission: 2026-02-12 23:49:21

Server State (python)

Time of First Successful Submission: 2026-02-13 00:03:25

Listening Web

Time of First Successful Submission: 2026-02-13 00:13:55

Speaking Redirects

Time of First Successful Submission: 2026-02-13 01:41:22

JavaScript Redirects

Time of First Successful Submission: 2026-02-13 15:36:24

Including JavaScript

Time of First Successful Submission: 2026-02-13 17:14:52

HTTP (javascript)

Time of First Successful Submission: 2026-02-13 17:57:19

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-02-13 18:20:00

HTTP Forms (javascript)

Time of First Successful Submission: 2026-02-13 18:51:43

SQL Queries

Time of First Successful Submission: 2026-02-13 19:06:31

Filtering SQL

Time of First Successful Submission: 2026-02-13 19:17:40

Choosing Columns

Time of First Successful Submission: 2026-02-13 19:35:12

Exclusionary Filtering

Time of First Successful Submission: 2026-02-13 19:40:55

Filtering Strings

Time of First Successful Submission: 2026-02-13 19:47:12

Filtering on Expressions

Time of First Successful Submission: 2026-02-13 20:15:25

SELECTing Expressions

Time of First Successful Submission: 2026-02-14 22:05:51

Composite Conditions

Time of First Successful Submission: 2026-02-14 22:10:44

Reaching Your LIMITs

Time of First Successful Submission: 2026-02-14 22:16:41

Querying Metadata

Time of First Successful Submission: 2026-02-14 22:22:51

GCA CTF

6 / 104 28257 / 42355

Using the Terminal

Time of First Successful Submission: 2026-01-12 05:09:16

Using the VSCode Workspace

Time of First Successful Submission: 2026-01-12 05:33:15

Using the GUI Desktop

Time of First Successful Submission: 2026-01-12 05:35:48

Pasting into the Desktop

Time of First Successful Submission: 2026-01-12 05:37:39

Restarting Challenges

Time of First Successful Submission: 2026-01-12 14:33:49

Getting Help

Time of First Successful Submission: 2026-01-12 14:41:25