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Intro to Programming Languages

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Lecture 1.1. Course Environment

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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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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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CSRF 5

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File Formats: Magic Numbers (Python)

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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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Reading Endianness (x86)

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Version Information (Python)

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Version Information (C)

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Version Information (x86)

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Metadata and Data (Python)

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Metadata and Data (C)

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Metadata and Data (x86)

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Input Restrictions (Python)

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Input Restrictions (C)

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Input Restrictions (x86)

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Behold the cIMG! (Python)

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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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File Formats: Directives (C)

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File Formats: Directives (x86)

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The Patch Directive

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Optimizing for Space

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Storage and Retrieval

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Extracting Knowledge

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Advanced Sprites

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Accessing Resources

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Unsafe Animations

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Animations

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Your First Overflow (easy)

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Your First Overflow (hard)

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Precision (easy)

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Precision (hard)

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Variable Control (easy)

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Variable Control (hard)

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Control Hijack (easy)

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Control Hijack (hard)

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Tricky Control Hijack (easy)

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Tricky Control Hijack (hard)

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PIEs (easy)

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PIEs (hard)

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String Lengths (easy)

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String Lengths (hard)

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Basic Shellcode

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NOP Sleds

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NULL-Free Shellcode

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Hijack to (Mapped) Shellcode (easy)

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Hijack to (Mapped) Shellcode (hard)

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Hijack to Shellcode (easy)

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Hijack to Shellcode (hard)

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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

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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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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

Time of First Successful Submission: 2026-02-23 19:52:21

average-stack-values

Time of First Successful Submission: 2026-02-23 19:53:25

absolute-jump

Time of First Successful Submission: 2026-02-23 19:54:23

relative-jump

Time of First Successful Submission: 2026-02-23 19:56:37

jump-trampoline

Time of First Successful Submission: 2026-02-23 19:57:39

conditional-jump

Time of First Successful Submission: 2026-02-23 20:00:08

indirect-jump

Time of First Successful Submission: 2026-02-23 20:02:54

average-loop

Time of First Successful Submission: 2026-02-23 20:04:04

count-non-zero

Time of First Successful Submission: 2026-02-23 21:12:39

string-lower

Time of First Successful Submission: 2026-02-23 21:14:32

most-common-byte

Time of First Successful Submission: 2026-02-23 21:17:31

Exit

Time of First Successful Submission: 2026-02-23 22:44:24

Socket

Time of First Successful Submission: 2026-02-23 22:45:31

Bind

Time of First Successful Submission: 2026-02-23 22:46:42

Listen

Time of First Successful Submission: 2026-02-23 22:48:04

Accept

Time of First Successful Submission: 2026-02-23 22:50:23

Static Response

Time of First Successful Submission: 2026-02-23 22:53:28

Dynamic Response

Time of First Successful Submission: 2026-02-24 03:31:36

Iterative GET Server

Time of First Successful Submission: 2026-02-24 03:33:26

Concurrent GET Server

Time of First Successful Submission: 2026-02-24 03:36:46

Concurrent POST Server

Time of First Successful Submission: 2026-02-24 03:45:32

Web Server

Time of First Successful Submission: 2026-02-24 03:46:35

Debugging Programs

Time of First Successful Submission: 2026-02-23 21:22:35

Inspecting Registers

Time of First Successful Submission: 2026-02-23 21:29:07

Examining Memory

Time of First Successful Submission: 2026-02-23 21:54:18

Setting Breakpoints

Time of First Successful Submission: 2026-02-23 22:10:20

Playing With Programs

65 / 116 4156 / 23371

What's the password?

Time of First Successful Submission: 2026-01-21 05:26:02

... and again!

Time of First Successful Submission: 2026-01-21 05:26:45

Newline Troubles

Time of First Successful Submission: 2026-01-21 05:29:44

Reasoning about files

Time of First Successful Submission: 2026-01-21 05:34:33

Specifying Filenames

Time of First Successful Submission: 2026-01-21 05:36:43

Binary and Hex Encoding

Time of First Successful Submission: 2026-01-21 05:40:48

More Hex

Time of First Successful Submission: 2026-01-21 05:43:08

Decoding Hex

Time of First Successful Submission: 2026-01-21 05:44:54

Decoding Practice

Time of First Successful Submission: 2026-01-21 05:46:33

Encoding Practice

Time of First Successful Submission: 2026-01-21 05:48:19

Hex-encoding ASCII

Time of First Successful Submission: 2026-01-21 05:49:40

Nested Encoding

Time of First Successful Submission: 2026-01-21 05:51:26

Hex-encoding UTF-8

Time of First Successful Submission: 2026-01-21 05:53:03

UTF Mixups

Time of First Successful Submission: 2026-01-21 05:54:39

Modifying Encoded Data

Time of First Successful Submission: 2026-01-21 05:55:50

Decoding Base64

Time of First Successful Submission: 2026-01-21 05:57:17

Encoding Base64

Time of First Successful Submission: 2026-01-21 05:58:44

Dealing with Obfuscation

Time of First Successful Submission: 2026-01-21 06:03:52

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-01-21 06:07:11

Your First HTTP Request

Time of First Successful Submission: 2026-01-20 21:23:52

Reading Flask

Time of First Successful Submission: 2026-01-20 21:29:22

Commented Data

Time of First Successful Submission: 2026-01-21 02:02:44

HTTP Metadata

Time of First Successful Submission: 2026-01-21 02:06:11

HTTP (netcat)

Time of First Successful Submission: 2026-01-21 02:13:14

HTTP Paths (netcat)

Time of First Successful Submission: 2026-01-21 02:16:44

HTTP (curl)

Time of First Successful Submission: 2026-01-21 02:20:22

HTTP (python)

Time of First Successful Submission: 2026-01-21 02:26:46

HTTP Host Header (python)

Time of First Successful Submission: 2026-01-21 02:38:18

HTTP Host Header (curl)

Time of First Successful Submission: 2026-01-21 02:40:49

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-01-21 02:46:26

URL Encoding (netcat)

Time of First Successful Submission: 2026-01-21 02:52:53

HTTP GET Parameters

Time of First Successful Submission: 2026-01-21 02:56:36

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-01-21 02:58:54

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-01-21 03:01:55

HTTP Forms

Time of First Successful Submission: 2026-01-21 03:04:26

HTTP Forms (curl)

Time of First Successful Submission: 2026-01-21 03:06:45

HTTP Forms (netcat)

Time of First Successful Submission: 2026-01-21 03:09:09

HTTP Forms (python)

Time of First Successful Submission: 2026-01-21 03:11:10

HTTP Forms Without Forms

Time of First Successful Submission: 2026-01-21 03:16:18

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-01-21 03:17:50

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-01-21 03:23:38

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-01-21 03:26:37

HTTP Redirects (curl)

Time of First Successful Submission: 2026-01-21 03:28:14

HTTP Redirects (python)

Time of First Successful Submission: 2026-01-21 03:29:47

HTTP Cookies (curl)

Time of First Successful Submission: 2026-01-21 03:32:49

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-01-21 03:35:26

HTTP Cookies (python)

Time of First Successful Submission: 2026-01-21 03:36:23

Server State (python)

Time of First Successful Submission: 2026-01-21 03:37:44

Listening Web

Time of First Successful Submission: 2026-01-21 03:40:22

Speaking Redirects

Time of First Successful Submission: 2026-01-21 03:45:14

JavaScript Redirects

Time of First Successful Submission: 2026-01-21 03:52:21

Including JavaScript

Time of First Successful Submission: 2026-01-21 04:01:11

HTTP (javascript)

Time of First Successful Submission: 2026-01-21 04:05:14

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-01-21 04:15:12

HTTP Forms (javascript)

Time of First Successful Submission: 2026-01-21 04:18:52

SQL Queries

Time of First Successful Submission: 2026-01-21 04:32:49

Filtering SQL

Time of First Successful Submission: 2026-01-21 04:37:01

Choosing Columns

Time of First Successful Submission: 2026-01-21 04:39:44

Exclusionary Filtering

Time of First Successful Submission: 2026-01-21 04:41:56

Filtering Strings

Time of First Successful Submission: 2026-01-21 04:45:05

Filtering on Expressions

Time of First Successful Submission: 2026-01-21 04:47:16

SELECTing Expressions

Time of First Successful Submission: 2026-01-21 05:00:49

Composite Conditions

Time of First Successful Submission: 2026-01-21 05:05:19

Reaching Your LIMITs

Time of First Successful Submission: 2026-01-21 05:07:34

Querying Metadata

Time of First Successful Submission: 2026-01-21 05:09:51

GCA CTF

5 / 104 32201 / 43579

Using the Terminal

Time of First Successful Submission: 2026-01-12 18:15:11

Using the VSCode Workspace

Time of First Successful Submission: 2026-01-12 18:17:09

Using the GUI Desktop

Time of First Successful Submission: 2026-01-12 19:14:34

Pasting into the Desktop

Time of First Successful Submission: 2026-01-12 19:16:25

Restarting Challenges

Time of First Successful Submission: 2026-01-12 19:21:48