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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-01-13 04:15:07

Command Arguments

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Command History

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The Root Path

Time of First Successful Submission: 2026-01-13 04:37:27

Absolute Paths

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Changing position

Time of First Successful Submission: 2026-01-13 04:42:58

Changing to an Absolute Path

Time of First Successful Submission: 2026-01-13 04:44:08

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

Time of First Successful Submission: 2026-01-13 21:35:32

Piping Stdout

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Piping Stdin

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Intro to Cybersecurity

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Path Traversal 1

Time of First Successful Submission: 2026-02-08 20:11:52

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

Time of First Successful Submission: 2026-02-09 06:11:11

CMDi 5

Time of First Successful Submission: 2026-02-09 06:28:45

Authentication Bypass 1

Time of First Successful Submission: 2026-02-09 06:34:25

Authentication Bypass 2

Time of First Successful Submission: 2026-02-09 06:38:46

SQLi 1

Time of First Successful Submission: 2026-02-10 06:24:09

SQLi 2

Time of First Successful Submission: 2026-02-10 07:07:03

SQLi 3

Time of First Successful Submission: 2026-02-11 04:47:07

SQLi 4

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SQLi 5

Time of First Successful Submission: 2026-02-18 20:45:59

XSS 1

Time of First Successful Submission: 2026-02-19 20:15:23

XSS 2

Time of First Successful Submission: 2026-02-19 22:53:42

XSS 3

Time of First Successful Submission: 2026-02-20 01:08:41

XSS 4

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XSS 5

Time of First Successful Submission: 2026-02-21 03:38:01

XSS 6

Time of First Successful Submission: 2026-02-21 03:40:58

File Formats: Magic Numbers (Python)

Time of First Successful Submission: 2026-03-09 02:51:42

File Formats: Magic Numbers (C)

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File Formats: Magic Numbers (x86)

Time of First Successful Submission: 2026-03-09 03:19:34

Reading Endianness (Python)

Time of First Successful Submission: 2026-03-09 03:29:22

Reading Endianness (C)

Time of First Successful Submission: 2026-03-09 03:34:06

Reading Endianness (x86)

Time of First Successful Submission: 2026-03-09 03:36:25

Version Information (Python)

Time of First Successful Submission: 2026-03-09 03:41:37

Version Information (C)

Time of First Successful Submission: 2026-03-09 03:54:33

Version Information (x86)

Time of First Successful Submission: 2026-03-09 03:56:53

Metadata and Data (Python)

Time of First Successful Submission: 2026-03-09 04:04:36

Metadata and Data (C)

Time of First Successful Submission: 2026-03-09 04:14:29

Metadata and Data (x86)

Time of First Successful Submission: 2026-03-09 04:18:08

Input Restrictions (Python)

Time of First Successful Submission: 2026-03-09 04:22:43

Input Restrictions (C)

Time of First Successful Submission: 2026-03-09 04:29:21

Input Restrictions (x86)

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Behold the cIMG! (Python)

Time of First Successful Submission: 2026-03-09 04:37:47

Behold the cIMG! (C)

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Behold the cIMG! (x86)

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A Basic cIMG (Python)

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A Basic cIMG (C)

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A Basic cIMG (x86)

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Internal State Mini (C)

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Internal State Mini (x86)

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Internal State (C)

Time of First Successful Submission: 2026-03-23 22:43:21

Internal State (x86)

Time of First Successful Submission: 2026-03-23 22:51:44

File Formats: Directives (C)

Time of First Successful Submission: 2026-03-23 23:19:12

Your First Overflow (easy)

Time of First Successful Submission: 2026-03-31 03:42:20

Your First Overflow (hard)

Time of First Successful Submission: 2026-03-31 03:44:27

Precision (easy)

Time of First Successful Submission: 2026-03-31 03:46:02

Precision (hard)

Time of First Successful Submission: 2026-03-31 03:52:32

Variable Control (easy)

Time of First Successful Submission: 2026-03-31 03:55:21

Variable Control (hard)

Time of First Successful Submission: 2026-03-31 04:05:43

Control Hijack (easy)

Time of First Successful Submission: 2026-03-31 06:21:02

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: 2026-01-13 04:15:07

Intro to Arguments

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Command History

Time of First Successful Submission: 2026-01-13 04:16:29

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

Time of First Successful Submission: 2026-01-13 05:12:20

cat: not the pet, but the command!

Time of First Successful Submission: 2026-01-13 05:18:47

catting absolute paths

Time of First Successful Submission: 2026-01-13 05:19:27

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

Time of First Successful Submission: 2026-01-13 21:53:40

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

Time of First Successful Submission: 2026-01-13 22:13:43

Writing to multiple programs

Time of First Successful Submission: 2026-01-13 22:20:12

Split-piping stderr and stdout

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Named pipes

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Printing Variables

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Setting Variables

Time of First Successful Submission: 2026-01-13 22:32:27

Multi-word Variables

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Exporting Variables

Time of First Successful Submission: 2026-01-13 22:35:13

Printing Exported Variables

Time of First Successful Submission: 2026-01-13 22:36:17

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: 2026-01-14 04:23:11

Groups and Files

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Fun With Groups Names

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Changing Permissions

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Executable Files

Time of First Successful Submission: 2026-01-14 04:36:55

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

Time of First Successful Submission: 2026-01-14 05:03:18

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

Time of First Successful Submission: 2026-01-14 06:04:41

Detaching and Attaching (tmux)

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Switching Windows (tmux)

Time of First Successful Submission: 2026-01-14 06:09:09

The PATH Variable

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Setting PATH

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Finding Commands

Time of First Successful Submission: 2026-01-14 06:12:10

Adding Commands

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Hijacking Commands

Time of First Successful Submission: 2026-01-14 06:30:48

Bashrc Backdoor

Time of First Successful Submission: 2026-01-14 06:35:41

Sniffing Input

Time of First Successful Submission: 2026-01-14 06:48:15

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

Time of First Successful Submission: 2026-02-23 01:30:30

Building Executables

Time of First Successful Submission: 2026-02-23 01:32:11

Moving Between Registers

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Loading From Memory

Time of First Successful Submission: 2026-02-22 22:03:33

More Loading Practice

Time of First Successful Submission: 2026-02-22 22:05:21

Dereferencing Pointers

Time of First Successful Submission: 2026-02-22 22:06:54

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

Time of First Successful Submission: 2026-02-23 03:12:04

Popping Stack Values

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Examining Memory

Time of First Successful Submission: 2026-02-23 03:14:26

Examining Stack Pointers

Time of First Successful Submission: 2026-02-23 03:15:59

Cooperative Debugging

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Writing Output

Time of First Successful Submission: 2026-02-23 03:23:37

Chaining Syscalls

Time of First Successful Submission: 2026-02-23 03:25:47

Writing Strings

Time of First Successful Submission: 2026-02-23 03:27:24

Reading Data

Time of First Successful Submission: 2026-02-23 03:30:37

Opening Files

Time of First Successful Submission: 2026-02-23 03:34:41

Hardcoding the Filename

Time of First Successful Submission: 2026-02-23 03:36:30

Comparing Values

Time of First Successful Submission: 2026-02-23 03:38:47

Comparing Characters

Time of First Successful Submission: 2026-02-23 03:40:05

Conditional Control Flow

Time of First Successful Submission: 2026-02-23 03:42:42

Comparing Strings

Time of First Successful Submission: 2026-02-23 04:24:53

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

Time of First Successful Submission: 2026-03-02 01:39:07

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

Time of First Successful Submission: 2026-03-02 02:04:49

Examining Memory

Time of First Successful Submission: 2026-03-02 02:20:58

Setting Breakpoints

Time of First Successful Submission: 2026-03-02 02:58:10

GDB Scripting

Time of First Successful Submission: 2026-03-02 03:10:41

Modifying Data

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Modifying Execution

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-01-20 20:23:23

... and again!

Time of First Successful Submission: 2026-01-20 20:24:41

Newline Troubles

Time of First Successful Submission: 2026-01-20 20:27:44

Reasoning about files

Time of First Successful Submission: 2026-01-20 20:32:17

Specifying Filenames

Time of First Successful Submission: 2026-01-20 20:36:48

Binary and Hex Encoding

Time of First Successful Submission: 2026-01-20 20:49:56

More Hex

Time of First Successful Submission: 2026-01-20 20:54:35

Decoding Hex

Time of First Successful Submission: 2026-01-20 21:05:38

Decoding Practice

Time of First Successful Submission: 2026-01-21 16:29:51

Encoding Practice

Time of First Successful Submission: 2026-01-21 16:31:23

Hex-encoding ASCII

Time of First Successful Submission: 2026-01-21 16:35:02

Nested Encoding

Time of First Successful Submission: 2026-01-21 16:49:57

Hex-encoding UTF-8

Time of First Successful Submission: 2026-01-26 01:16:51

UTF Mixups

Time of First Successful Submission: 2026-01-26 01:42:34

Modifying Encoded Data

Time of First Successful Submission: 2026-01-26 01:55:38

Decoding Base64

Time of First Successful Submission: 2026-01-26 02:16:48

Encoding Base64

Time of First Successful Submission: 2026-01-26 02:22:51

Dealing with Obfuscation

Time of First Successful Submission: 2026-01-26 02:45:04

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-01-26 02:56:21

Your First HTTP Request

Time of First Successful Submission: 2026-01-26 05:07:51

Reading Flask

Time of First Successful Submission: 2026-01-26 05:12:02

Commented Data

Time of First Successful Submission: 2026-01-26 05:23:05

HTTP Metadata

Time of First Successful Submission: 2026-01-26 05:34:52

HTTP (netcat)

Time of First Successful Submission: 2026-01-26 05:38:36

HTTP Paths (netcat)

Time of First Successful Submission: 2026-01-26 05:40:40

HTTP (curl)

Time of First Successful Submission: 2026-01-26 05:42:46

HTTP (python)

Time of First Successful Submission: 2026-01-26 05:44:36

HTTP Host Header (python)

Time of First Successful Submission: 2026-01-26 05:47:52

HTTP Host Header (curl)

Time of First Successful Submission: 2026-01-26 05:51:22

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-01-26 05:53:28

URL Encoding (netcat)

Time of First Successful Submission: 2026-01-26 05:55:55

HTTP GET Parameters

Time of First Successful Submission: 2026-01-26 05:57:43

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-02-01 18:39:52

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-02-01 18:42:49

HTTP Forms

Time of First Successful Submission: 2026-02-01 18:46:08

HTTP Forms (curl)

Time of First Successful Submission: 2026-02-01 18:47:46

HTTP Forms (netcat)

Time of First Successful Submission: 2026-02-01 18:50:02

HTTP Forms (python)

Time of First Successful Submission: 2026-02-01 18:55:47

HTTP Forms Without Forms

Time of First Successful Submission: 2026-02-01 18:57:09

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-02-01 18:58:58

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-02-01 19:00:13

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-02-01 19:03:42

HTTP Redirects (curl)

Time of First Successful Submission: 2026-02-01 19:06:19

HTTP Redirects (python)

Time of First Successful Submission: 2026-02-01 19:10:12

HTTP Cookies (curl)

Time of First Successful Submission: 2026-02-01 19:17:00

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-02-01 19:22:49

HTTP Cookies (python)

Time of First Successful Submission: 2026-02-01 19:24:55

Server State (python)

Time of First Successful Submission: 2026-02-01 19:26:51

Listening Web

Time of First Successful Submission: 2026-02-01 19:30:48

Speaking Redirects

Time of First Successful Submission: 2026-02-01 20:13:46

JavaScript Redirects

Time of First Successful Submission: 2026-02-01 20:19:48

Including JavaScript

Time of First Successful Submission: 2026-02-01 20:27:03

HTTP (javascript)

Time of First Successful Submission: 2026-02-01 20:29:47

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-02-01 20:37:02

HTTP Forms (javascript)

Time of First Successful Submission: 2026-02-01 20:41:02

SQL Queries

Time of First Successful Submission: 2026-02-01 20:44:30

Filtering SQL

Time of First Successful Submission: 2026-02-01 20:47:54

Choosing Columns

Time of First Successful Submission: 2026-02-01 20:59:51

Exclusionary Filtering

Time of First Successful Submission: 2026-02-01 21:02:35

Filtering Strings

Time of First Successful Submission: 2026-02-01 21:05:46

Filtering on Expressions

Time of First Successful Submission: 2026-02-01 21:09:33

SELECTing Expressions

Time of First Successful Submission: 2026-02-01 21:17:30

Composite Conditions

Time of First Successful Submission: 2026-02-01 21:22:26

Reaching Your LIMITs

Time of First Successful Submission: 2026-02-01 21:28:09

Querying Metadata

Time of First Successful Submission: 2026-02-01 21:33:21

GCA CTF

6 / 104 28965 / 43578

Using the Terminal

Time of First Successful Submission: 2026-01-13 03:54:32

Using the VSCode Workspace

Time of First Successful Submission: 2026-01-13 03:55:48

Using the GUI Desktop

Time of First Successful Submission: 2026-01-13 03:57:38

Pasting into the Desktop

Time of First Successful Submission: 2026-01-13 03:58:55

Restarting Challenges

Time of First Successful Submission: 2026-01-13 04:00:53

Getting Help

Time of First Successful Submission: 2026-01-14 19:29:55