umer_sharif

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Intro to Programming Languages

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Commands

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Command Arguments

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Command History

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The Root Path

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Absolute Paths

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Changing position

Time of First Successful Submission: 2026-08-28 00:12:56

Changing to an Absolute Path

Time of First Successful Submission: 2026-08-28 00:15:28

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

Time of First Successful Submission: 2026-09-21 06:47:11

CMDi 3

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CMDi 4

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CMDi 5

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CMDi 6

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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

Time of First Successful Submission: 2026-09-21 07:53:56

File Formats: Magic Numbers (Python)

Time of First Successful Submission: 2026-10-26 23:24:59

File Formats: Magic Numbers (C)

Time of First Successful Submission: 2026-10-26 23:28:53

File Formats: Magic Numbers (x86)

Time of First Successful Submission: 2026-10-26 23:31:07

Reading Endianness (Python)

Time of First Successful Submission: 2026-10-26 23:31:59

Reading Endianness (C)

Time of First Successful Submission: 2026-10-26 23:33:31

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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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

Time of First Successful Submission: 2026-08-28 00:15:28

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

Time of First Successful Submission: 2026-08-29 01:22:42

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

Time of First Successful Submission: 2026-08-31 03:10:06

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: 2026-09-01 00:27:51

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

Time of First Successful Submission: 2026-10-05 03:34:56

Moving Between Registers

Time of First Successful Submission: 2026-10-05 03:36:37

Loading From Memory

Time of First Successful Submission: 2026-10-06 04:33:52

More Loading Practice

Time of First Successful Submission: 2026-10-06 04:34:31

Dereferencing Pointers

Time of First Successful Submission: 2026-10-06 04:35:13

Dereferencing Yourself

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Dereferencing with Offsets

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Stored Addresses

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Double Dereference

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The Stack

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Stack Offsets

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Program Arguments on the Stack

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Popping From the Stack

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Negative Numbers

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Negative Numbers (16-bit)

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Negative Numbers (32-bit)

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Encoding Negatives

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Binary and Hex Encoding

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More Hex

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Decoding Hex

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Mixed Conversions

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Disassembling Programs

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Tracing Syscalls

Time of First Successful Submission: 2026-10-06 05:55:47

Starting GDB

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Quitting GDB

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Starting Programs in GDB

Time of First Successful Submission: 2026-10-06 05:59:06

Disassembling in GDB

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Stepping Through Instructions

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Reading Register Values

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Setting Register Values

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Popping Stack Values

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Examining Memory

Time of First Successful Submission: 2026-10-14 04:00:02

Examining Stack Pointers

Time of First Successful Submission: 2026-10-14 04:01:11

Cooperative Debugging

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Running with Arguments

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Redirecting Input in GDB

Time of First Successful Submission: 2026-10-14 04:10:32

Writing Output

Time of First Successful Submission: 2026-10-18 01:35:43

Chaining Syscalls

Time of First Successful Submission: 2026-10-18 01:37:14

Writing Strings

Time of First Successful Submission: 2026-10-18 01:38:07

Reading Data

Time of First Successful Submission: 2026-10-18 01:39:31

Reading Exactly

Time of First Successful Submission: 2026-10-18 01:40:52

Opening Files

Time of First Successful Submission: 2026-10-18 01:42:38

Hardcoding the Filename

Time of First Successful Submission: 2026-10-18 01:43:59

RIP-Relative Strings

Time of First Successful Submission: 2026-10-18 01:49:41

Comparing Values

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Comparing Characters

Time of First Successful Submission: 2026-10-22 01:25:14

Conditional Control Flow

Time of First Successful Submission: 2026-10-22 01:26:09

Comparing Strings

Time of First Successful Submission: 2026-10-22 01:26:51

Reverse the Password

Time of First Successful Submission: 2026-10-22 01:27:35

Conditionals Without Conditionals

Time of First Successful Submission: 2026-10-22 01:32:37

Recognizing Loops

Time of First Successful Submission: 2026-10-27 00:01:32

Writing Loops

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Writing From a Shared Library

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Returning a Value

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Calling Through a Pointer

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Calling Through a Pointer with an Argument

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Saving Caller-Saved Registers

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Saving Callee-Saved Registers

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Sign Extension

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Little-Endian Bytes

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Qword by Qword

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Dword by Dword

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Word by Word

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Byte by Byte

Time of First Successful Submission: 2026-10-27 00:17:33

Cracking a Struct

Time of First Successful Submission: 2026-10-27 00:19:00

Scrambled Struct

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Reverse the Calculation

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Reverse the Reverse

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Dealing with Bitwise Operations

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Even or Odd

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Masking Bits

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Lowercase a String

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Uppercase a String

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Swap Case

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Shifting Left

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Shifting Right

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Loops on Data

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Reaching Into the Caller's Frame

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Loading Stale Stack Data

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Stealing Stale Stack Data

Time of First Successful Submission: 2026-10-27 00:34:32

Reserving Your Own Frame

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Using Your Own Frame

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Environment Variables on the Stack

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Aligning the Stack Through the Environment

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Aligning the Stack Through GDB

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Aligning the Stack Through GDB, Generalized

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A Single Digit

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Two Digits

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String to Integer

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Negative Numbers

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Where the Number Ends

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A Whole Program

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A Single Digit, Back to Text

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Divide and Remainder

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Drop the Leading Zero

Time of First Successful Submission: 2026-10-27 01:22:26

Integer to String

Time of First Successful Submission: 2026-10-27 01:23:19

Negative Numbers, Back to Text

Time of First Successful Submission: 2026-10-27 01:24:14

Sum Them All

Time of First Successful Submission: 2026-10-27 01:25:06

Addition

Time of First Successful Submission: 2026-10-27 01:26:10

Subtraction

Time of First Successful Submission: 2026-10-27 01:27:13

Multiplication

Time of First Successful Submission: 2026-10-27 01:28:09

Bitwise Operators

Time of First Successful Submission: 2026-10-27 01:29:02

Unary Operators

Time of First Successful Submission: 2026-10-27 01:29:58

Literal Output

Time of First Successful Submission: 2026-10-27 01:30:51

Newline Escapes

Time of First Successful Submission: 2026-10-27 01:31:38

Escaped Syntax

Time of First Successful Submission: 2026-10-27 01:32:37

Decimal Markers

Time of First Successful Submission: 2026-10-27 01:33:26

Multiple Decimal Markers

Time of First Successful Submission: 2026-10-27 01:34:32

String Markers

Time of First Successful Submission: 2026-10-27 01:35:30

Hex Byte Escapes

Time of First Successful Submission: 2026-10-27 01:36:22

Debugging Programs

Time of First Successful Submission: 2026-10-27 02:08:21

Inspecting Registers

Time of First Successful Submission: 2026-10-27 02:09:25

Examining Memory

Time of First Successful Submission: 2026-10-27 02:11:04

Setting Breakpoints

Time of First Successful Submission: 2026-10-27 02:31:56

GDB Scripting

Time of First Successful Submission: 2026-10-27 02:49:38

Modifying Data

Time of First Successful Submission: 2026-10-27 03:16:44

Modifying Execution

Time of First Successful Submission: 2026-10-27 03:17:23

Broken Functions

Time of First Successful Submission: 2026-10-27 03:29:45

Exit

Time of First Successful Submission: 2026-10-27 04:08:26

Socket

Time of First Successful Submission: 2026-10-27 04:21:25

Bind

Time of First Successful Submission: 2026-10-27 04:23:24

Listen

Time of First Successful Submission: 2026-10-27 04:24:54

Accept

Time of First Successful Submission: 2026-10-27 04:26:24

Static Response

Time of First Successful Submission: 2026-10-27 04:39:25

Dynamic Response

Time of First Successful Submission: 2026-10-27 04:45:59

Iterative GET Server

Time of First Successful Submission: 2026-10-27 04:47:05

Concurrent GET Server

Time of First Successful Submission: 2026-10-27 04:54:11

Concurrent POST Server

Time of First Successful Submission: 2026-10-27 04:56:50

Web Server

Time of First Successful Submission: 2026-10-27 05:00:54

Playing With Programs

65 / 116 5562 / 27201

What's the password?

Time of First Successful Submission: 2026-09-09 03:49:34

... and again!

Time of First Successful Submission: 2026-09-11 01:45:02

Newline Troubles

Time of First Successful Submission: 2026-09-11 01:46:23

Reasoning about files

Time of First Successful Submission: 2026-09-11 01:47:25

Specifying Filenames

Time of First Successful Submission: 2026-09-11 01:49:12

Binary and Hex Encoding

Time of First Successful Submission: 2026-09-11 01:50:09

More Hex

Time of First Successful Submission: 2026-09-14 23:26:41

Decoding Hex

Time of First Successful Submission: 2026-09-14 23:27:32

Decoding Practice

Time of First Successful Submission: 2026-09-14 23:29:32

Encoding Practice

Time of First Successful Submission: 2026-09-14 23:30:12

Hex-encoding ASCII

Time of First Successful Submission: 2026-09-14 23:31:07

Nested Encoding

Time of First Successful Submission: 2026-09-14 23:31:46

Hex-encoding UTF-8

Time of First Successful Submission: 2026-09-14 23:33:16

UTF Mixups

Time of First Successful Submission: 2026-09-14 23:34:22

Modifying Encoded Data

Time of First Successful Submission: 2026-09-14 23:38:06

Decoding Base64

Time of First Successful Submission: 2026-09-14 23:38:57

Encoding Base64

Time of First Successful Submission: 2026-09-14 23:40:08

Dealing with Obfuscation

Time of First Successful Submission: 2026-09-14 23:41:50

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-09-14 23:42:39

Your First HTTP Request

Time of First Successful Submission: 2026-09-11 01:54:56

Reading Flask

Time of First Successful Submission: 2026-09-11 01:57:26

Commented Data

Time of First Successful Submission: 2026-09-11 02:01:30

HTTP Metadata

Time of First Successful Submission: 2026-09-11 02:07:21

HTTP (netcat)

Time of First Successful Submission: 2026-09-15 00:05:59

HTTP Paths (netcat)

Time of First Successful Submission: 2026-09-15 00:10:52

HTTP (curl)

Time of First Successful Submission: 2026-09-15 00:11:51

HTTP (python)

Time of First Successful Submission: 2026-09-15 00:13:12

HTTP Host Header (python)

Time of First Successful Submission: 2026-09-15 00:14:18

HTTP Host Header (curl)

Time of First Successful Submission: 2026-09-15 00:15:29

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-09-15 00:16:34

URL Encoding (netcat)

Time of First Successful Submission: 2026-09-15 00:17:48

HTTP GET Parameters

Time of First Successful Submission: 2026-09-15 00:18:54

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-09-15 00:20:01

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-09-15 00:21:18

HTTP Forms

Time of First Successful Submission: 2026-09-15 00:23:57

HTTP Forms (curl)

Time of First Successful Submission: 2026-09-17 05:27:48

HTTP Forms (netcat)

Time of First Successful Submission: 2026-09-17 22:47:46

HTTP Forms (python)

Time of First Successful Submission: 2026-09-17 23:01:30

HTTP Forms Without Forms

Time of First Successful Submission: 2026-09-17 23:09:22

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-09-17 23:11:02

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-09-17 23:12:42

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-09-17 23:13:56

HTTP Redirects (curl)

Time of First Successful Submission: 2026-09-17 23:19:22

HTTP Redirects (python)

Time of First Successful Submission: 2026-09-18 00:47:37

HTTP Cookies (curl)

Time of First Successful Submission: 2026-09-18 00:49:11

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-09-18 00:50:14

HTTP Cookies (python)

Time of First Successful Submission: 2026-09-18 00:51:06

Server State (python)

Time of First Successful Submission: 2026-09-18 00:51:54

Listening Web

Time of First Successful Submission: 2026-09-18 00:53:09

Speaking Redirects

Time of First Successful Submission: 2026-09-18 01:05:57

JavaScript Redirects

Time of First Successful Submission: 2026-09-18 01:07:22

Including JavaScript

Time of First Successful Submission: 2026-09-18 03:49:54

HTTP (javascript)

Time of First Successful Submission: 2026-09-18 03:51:19

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-09-18 05:16:14

HTTP Forms (javascript)

Time of First Successful Submission: 2026-09-18 05:18:06

SQL Queries

Time of First Successful Submission: 2026-09-18 05:19:16

Filtering SQL

Time of First Successful Submission: 2026-09-18 05:20:07

Choosing Columns

Time of First Successful Submission: 2026-09-18 05:21:05

Exclusionary Filtering

Time of First Successful Submission: 2026-09-18 05:22:00

Filtering Strings

Time of First Successful Submission: 2026-09-18 05:22:52

Filtering on Expressions

Time of First Successful Submission: 2026-09-18 05:23:54

SELECTing Expressions

Time of First Successful Submission: 2026-09-18 05:32:05

Composite Conditions

Time of First Successful Submission: 2026-09-18 05:33:24

Reaching Your LIMITs

Time of First Successful Submission: 2026-09-18 05:39:26

Querying Metadata

Time of First Successful Submission: 2026-09-18 05:40:49

DSU Cyber Camps

5 / 104 51013 / 74375

Using the Terminal

Time of First Successful Submission: 2026-08-27 03:34:03

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-27 03:40:58

Using the GUI Desktop

Time of First Successful Submission: 2026-08-27 03:48:09

Pasting into the Desktop

Time of First Successful Submission: 2026-08-27 03:50:38

Restarting Challenges

Time of First Successful Submission: 2026-08-27 03:52:25

GCA CTF

5 / 104 51013 / 74375

Using the Terminal

Time of First Successful Submission: 2026-08-27 03:34:03

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-27 03:40:58

Using the GUI Desktop

Time of First Successful Submission: 2026-08-27 03:48:09

Pasting into the Desktop

Time of First Successful Submission: 2026-08-27 03:50:38

Restarting Challenges

Time of First Successful Submission: 2026-08-27 03:52:25