ZHACKS

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Intro to Programming Languages

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P1.0 Level 1 Open /flag in VSCode

Time of First Successful Submission: 2026-04-30 17:20:42

Commands

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Command Arguments

Time of First Successful Submission: 2026-04-03 10:00:41

Command History

Time of First Successful Submission: 2026-04-03 10:01:10

The Root Path

Time of First Successful Submission: 2026-04-03 10:22:02

Absolute Paths

Time of First Successful Submission: 2026-04-03 10:33:51

Changing position

Time of First Successful Submission: 2026-04-03 10:40:35

Changing to an Absolute Path

Time of First Successful Submission: 2026-04-03 10:45:30

Relative Paths

Time of First Successful Submission: 2026-04-03 18:48:44

P1.0 Level 5 read

Time of First Successful Submission: 2026-04-30 17:19:45

Cat

Time of First Successful Submission: 2026-04-03 19:32:55

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

Time of First Successful Submission: 2026-04-06 04:21:59

Lecture 2.1.1.0 Paradigms and C

Time of First Successful Submission: 2026-04-30 17:50:42

Lecture 2.1.2. First C Program and Vars

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Lecture 2.1.2.1. Standard Output

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Lecture 2.1.2.2. Standard In

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P2.1 Level 01 C Force

Time of First Successful Submission: 2026-04-30 17:31:03


Intro to Cybersecurity

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Path Traversal 1

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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

Time of First Successful Submission: 2026-04-02 18:34:29

Challenge Programs

Time of First Successful Submission: 2026-04-02 11:50:54

The Flag File

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Using Privileged Mode

Time of First Successful Submission: 2026-04-02 17:48:23

Persistent Home Directories - One

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Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-02 17:52:56


Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-04-03 09:59:38

Intro to Arguments

Time of First Successful Submission: 2026-04-03 10:00:41

Command History

Time of First Successful Submission: 2026-04-03 10:01:10

The Root

Time of First Successful Submission: 2026-04-03 10:22:02

Program and absolute paths

Time of First Successful Submission: 2026-04-03 10:33:51

Position thy self

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Position elsewhere

Time of First Successful Submission: 2026-04-03 10:45:30

implicit relative paths, from /

Time of First Successful Submission: 2026-04-03 18:48:44

explicit relative paths, from /

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implicit relative path

Time of First Successful Submission: 2026-04-03 18:59:09

home sweet home

Time of First Successful Submission: 2026-04-03 19:09:14

cat: not the pet, but the command!

Time of First Successful Submission: 2026-04-03 19:32:55

catting absolute paths

Time of First Successful Submission: 2026-04-03 19:34:04

more catting practice

Time of First Successful Submission: 2026-04-03 19:38:45

grepping for a needle in a haystack

Time of First Successful Submission: 2026-04-03 19:49:21

comparing files

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listing files

Time of First Successful Submission: 2026-04-03 20:04:13

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

Time of First Successful Submission: 2026-04-07 10:59:47

Writing to multiple programs

Time of First Successful Submission: 2026-04-07 11:30:40

Split-piping stderr and stdout

Time of First Successful Submission: 2026-04-08 10:12:36

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

Time of First Successful Submission: 2026-04-10 22:05:23

Storing Command Output

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Reading Input

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Reading Files

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Translating characters

Time of First Successful Submission: 2026-04-14 03:43:12

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

Time of First Successful Submission: 2026-04-14 10:11:24

Using sudo

Time of First Successful Submission: 2026-04-14 10:17:43

Changing File Ownership

Time of First Successful Submission: 2026-04-16 02:31:46

Groups and Files

Time of First Successful Submission: 2026-04-16 05:47:53

Fun With Groups Names

Time of First Successful Submission: 2026-04-16 05:49:07

Changing Permissions

Time of First Successful Submission: 2026-04-16 06:00:40

Executable Files

Time of First Successful Submission: 2026-04-16 06:03:44

Permission Tweaking Practice

Time of First Successful Submission: 2026-04-16 06:31:19

Permissions Setting Practice

Time of First Successful Submission: 2026-04-16 06:50:06

The SUID Bit

Time of First Successful Submission: 2026-04-16 07:01:52

Chaining with Semicolons

Time of First Successful Submission: 2026-04-16 07:22:33

Building on Success

Time of First Successful Submission: 2026-04-16 07:24:57

Handling Failure

Time of First Successful Submission: 2026-04-16 07:26:33

Your First Shell Script

Time of First Successful Submission: 2026-04-16 11:44:38

Redirecting Script Output

Time of First Successful Submission: 2026-04-16 12:05:16

Executable Shell Scripts

Time of First Successful Submission: 2026-04-16 16:03:47

Understanding Shebangs

Time of First Successful Submission: 2026-04-16 16:22:13

Scripting with Arguments

Time of First Successful Submission: 2026-04-17 03:23:00

Scripting with Conditionals

Time of First Successful Submission: 2026-04-17 03:52:24

Scripting with Default Cases

Time of First Successful Submission: 2026-04-17 03:56:37

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-04-17 04:06:21

Reading Shell Scripts

Time of First Successful Submission: 2026-04-17 04:05:33

Launching Screen

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Detaching and Attaching

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Finding Sessions

Time of First Successful Submission: 2026-04-17 12:55:56

Switching Windows

Time of First Successful Submission: 2026-04-17 12:57:56

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-17 13:03:44

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-17 13:05:02

The PATH Variable

Time of First Successful Submission: 2026-04-17 13:12:41

Setting PATH

Time of First Successful Submission: 2026-04-17 13:21:13

Finding Commands

Time of First Successful Submission: 2026-04-17 13:25:22

Adding Commands

Time of First Successful Submission: 2026-04-17 19:46:38

Hijacking Commands

Time of First Successful Submission: 2026-04-20 07:27:11

Bashrc Backdoor

Time of First Successful Submission: 2026-04-20 23:47:43

Sniffing Input

Time of First Successful Submission: 2026-04-21 00:07:45

Overshared Directories

Time of First Successful Submission: 2026-04-22 03:21:48

Tricky Linking

Time of First Successful Submission: 2026-04-22 03:51:37

Sniffing Process Arguments

Time of First Successful Submission: 2026-04-22 09:41:24

Snooping on Configurations

Time of First Successful Submission: 2026-04-22 09:49:42

The Fork Bomb

Time of First Successful Submission: 2026-04-22 10:21:36

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 /

Time of First Successful Submission: 2026-04-22 11:15:01


Computing 101

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Your First Register

Time of First Successful Submission: 2026-04-23 04:33:06

Your First Syscall

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Exit Codes

Time of First Successful Submission: 2026-04-23 04:40:32

Building Executables

Time of First Successful Submission: 2026-04-25 02:20:47

Moving Between Registers

Time of First Successful Submission: 2026-04-25 02:27:03

Loading From Memory

Time of First Successful Submission: 2026-04-30 11:45:48

More Loading Practice

Time of First Successful Submission: 2026-04-30 11:46:49

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

Time of First Successful Submission: 2026-05-01 10:40:52

Disassembling Programs

Time of First Successful Submission: 2026-05-01 12:00:14

Tracing Syscalls

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Starting GDB

Time of First Successful Submission: 2026-05-01 12:17:30

Quitting GDB

Time of First Successful Submission: 2026-05-01 12:18:19

Starting Programs in GDB

Time of First Successful Submission: 2026-05-01 12:23:10

Disassembling in GDB

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Stepping Through Instructions

Time of First Successful Submission: 2026-05-01 12:25:32

Reading Register Values

Time of First Successful Submission: 2026-05-01 12:26:32

Popping Stack Values

Time of First Successful Submission: 2026-05-01 12:28:06

Examining Memory

Time of First Successful Submission: 2026-05-01 12:32:13

Examining Stack Pointers

Time of First Successful Submission: 2026-05-01 12:37:28

Cooperative Debugging

Time of First Successful Submission: 2026-05-01 16:24:54

Writing Output

Time of First Successful Submission: 2026-05-01 17:31:09

Chaining Syscalls

Time of First Successful Submission: 2026-05-01 17:52:34

Writing Strings

Time of First Successful Submission: 2026-05-01 17:57:09

Reading Data

Time of First Successful Submission: 2026-05-02 10:52:36

Opening Files

Time of First Successful Submission: 2026-05-02 11:00:35

Hardcoding the Filename

Time of First Successful Submission: 2026-05-02 11:03:08

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

Time of First Successful Submission: 2026-05-05 14:49:29

Inspecting Registers

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Examining Memory

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Setting Breakpoints

Time of First Successful Submission: 2026-05-06 09:09:47

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: 2026-05-06 09:57:33

... and again!

Time of First Successful Submission: 2026-05-06 09:58:32

Newline Troubles

Time of First Successful Submission: 2026-05-06 10:15:28

Reasoning about files

Time of First Successful Submission: 2026-05-06 11:22:27

Specifying Filenames

Time of First Successful Submission: 2026-05-06 11:29:01

Binary and Hex Encoding

Time of First Successful Submission: 2026-05-06 19:29:38

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

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Modifying Encoded Data

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Decoding Base64

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Encoding Base64

Time of First Successful Submission: 2026-05-07 13:54:15

Dealing with Obfuscation

Time of First Successful Submission: 2026-05-07 13:58:22

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-05-07 17:14:58

Your First HTTP Request

Time of First Successful Submission: 2026-05-07 17:58:57

Reading Flask

Time of First Successful Submission: 2026-05-07 18:11:28

Commented Data

Time of First Successful Submission: 2026-05-07 18:27:07

HTTP Metadata

Time of First Successful Submission: 2026-05-07 18:32:54

HTTP (netcat)

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HTTP Paths (netcat)

Time of First Successful Submission: 2026-05-07 18:51:11

HTTP (curl)

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HTTP (python)

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HTTP Host Header (python)

Time of First Successful Submission: 2026-05-08 10:37:47

HTTP Host Header (curl)

Time of First Successful Submission: 2026-05-08 11:00:27

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-05-08 11:15:40

URL Encoding (netcat)

Time of First Successful Submission: 2026-05-08 11:29:01

HTTP GET Parameters

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Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-05-08 14:13:07

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-05-08 14:17:19

HTTP Forms

Time of First Successful Submission: 2026-05-08 16:38:45

HTTP Forms (curl)

Time of First Successful Submission: 2026-05-08 16:46:05

HTTP Forms (netcat)

Time of First Successful Submission: 2026-05-08 17:00:11

HTTP Forms (python)

Time of First Successful Submission: 2026-05-08 17:04:48

HTTP Forms Without Forms

Time of First Successful Submission: 2026-05-08 18:23:30

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-05-08 18:35:09

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-05-08 18:44:23

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-05-09 07:42:37

HTTP Redirects (curl)

Time of First Successful Submission: 2026-05-09 07:45:39

HTTP Redirects (python)

Time of First Successful Submission: 2026-05-09 07:50:18

HTTP Cookies (curl)

Time of First Successful Submission: 2026-05-09 08:15:03

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-05-09 08:25:15

HTTP Cookies (python)

Time of First Successful Submission: 2026-05-09 08:33:04

Server State (python)

Time of First Successful Submission: 2026-05-09 08:39:21

Listening Web

Time of First Successful Submission: 2026-05-09 09:01:06

Speaking Redirects

Time of First Successful Submission: 2026-05-09 10:57:12

JavaScript Redirects

Time of First Successful Submission: 2026-05-09 14:28:09

Including JavaScript

Time of First Successful Submission: 2026-05-09 14:42:29

HTTP (javascript)

Time of First Successful Submission: 2026-05-09 14:53:04

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-05-09 15:11:07

HTTP Forms (javascript)

Time of First Successful Submission: 2026-05-09 15:24:09

cat

Time of First Successful Submission: 2026-04-30 17:13:21

more

Time of First Successful Submission: 2026-04-30 17:14:10

less

Time of First Successful Submission: 2026-04-30 17:14:50

tail

Time of First Successful Submission: 2026-04-30 17:15:25

head

Time of First Successful Submission: 2026-04-30 17:15:59

sort

Time of First Successful Submission: 2026-04-30 17:16:39

vim

Time of First Successful Submission: 2026-05-08 17:11:07

emacs

Time of First Successful Submission: 2026-05-08 17:12:20

nano

Time of First Successful Submission: 2026-05-08 17:12:51

rev

Time of First Successful Submission: 2026-05-08 17:15:43

od

Time of First Successful Submission: 2026-05-08 17:16:57

hd

Time of First Successful Submission: 2026-05-08 17:18:02

xxd

Time of First Successful Submission: 2026-05-08 17:18:49

base32

Time of First Successful Submission: 2026-05-10 17:40:56

base64

Time of First Successful Submission: 2026-05-08 17:22:31

split

Time of First Successful Submission: 2026-05-08 17:23:41

gzip

Time of First Successful Submission: 2026-05-10 17:49:37

bzip2

Time of First Successful Submission: 2026-05-10 17:51:08

zip

Time of First Successful Submission: 2026-05-10 17:52:40

tar

Time of First Successful Submission: 2026-05-10 19:53:13

ar

Time of First Successful Submission: 2026-05-10 19:55:02

cpio

Time of First Successful Submission: 2026-05-10 19:57:16

env

Time of First Successful Submission: 2026-05-11 07:49:13

find

Time of First Successful Submission: 2026-05-11 07:53:15

nice

Time of First Successful Submission: 2026-05-11 07:59:36

timeout

Time of First Successful Submission: 2026-05-11 08:00:15

stdbuf

Time of First Successful Submission: 2026-05-11 08:01:28

setarch

Time of First Successful Submission: 2026-05-11 08:01:59

watch

Time of First Successful Submission: 2026-05-11 08:02:35

socat

Time of First Successful Submission: 2026-05-11 08:03:24

whiptail

Time of First Successful Submission: 2026-05-11 08:03:58

awk

Time of First Successful Submission: 2026-05-11 08:04:33

sed

Time of First Successful Submission: 2026-05-11 08:05:12

ed

Time of First Successful Submission: 2026-05-11 08:05:47

chown

Time of First Successful Submission: 2026-05-11 08:06:34

chmod

Time of First Successful Submission: 2026-05-11 08:07:12

cp

Time of First Successful Submission: 2026-05-11 08:30:51

python

Time of First Successful Submission: 2026-04-30 17:17:28

bash

Time of First Successful Submission: 2026-05-11 08:43:02

date

Time of First Successful Submission: 2026-05-11 08:14:30

dmesg

Time of First Successful Submission: 2026-05-11 08:15:28

wc

Time of First Successful Submission: 2026-05-11 08:16:17

gcc

Time of First Successful Submission: 2026-05-11 08:17:01

as

Time of First Successful Submission: 2026-05-11 08:17:34

ssh-keygen

Time of First Successful Submission: 2026-05-11 11:04:52

SQL Queries

Time of First Successful Submission: 2026-05-11 11:25:06

Filtering SQL

Time of First Successful Submission: 2026-05-11 19:01:35

Choosing Columns

Time of First Successful Submission: 2026-05-11 19:07:05

Exclusionary Filtering

Time of First Successful Submission: 2026-05-11 19:12:53

Filtering Strings

Time of First Successful Submission: 2026-05-11 19:16:32

Filtering on Expressions

Time of First Successful Submission: 2026-05-11 19:21:15

SELECTing Expressions

Time of First Successful Submission: 2026-05-11 19:33:18

Composite Conditions

Time of First Successful Submission: 2026-05-11 19:38:33

Reaching Your LIMITs

Time of First Successful Submission: 2026-05-11 19:40:44

Querying Metadata

Time of First Successful Submission: 2026-05-11 19:44:46


GCA CTF

11 / 104 9372 / 45680


Using the Terminal

Time of First Successful Submission: 2026-04-02 18:16:45

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-02 18:18:26

Using the GUI Desktop

Time of First Successful Submission: 2026-04-02 18:21:52

Pasting into the Desktop

Time of First Successful Submission: 2026-04-02 18:25:59

Restarting Challenges

Time of First Successful Submission: 2026-04-02 18:34:29

Getting Help

Time of First Successful Submission: 2026-04-02 18:40:05

Challenge Programs

Time of First Successful Submission: 2026-04-02 11:50:54

The Flag File

Time of First Successful Submission: 2026-04-02 11:54:05

Using Privileged Mode

Time of First Successful Submission: 2026-04-02 17:48:23

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-02 17:52:12

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-02 17:52:56