Cryptnotes

Cryptnotes is a repository of cybersecurity write-ups covering challenges from Cryptonite Task Phase: pwn.college's Linux Luminarium dojo, OverTheWire's Bandit game, and selected PicoCTF gym tasks.

Table of Contents

• Miscellaneous
  • OverTheWire Bandit
  • OasisCTF
• PicoCTF
• PWN College

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Miscellaneous

OverTheWire Bandit

• Level 0
• Level 0-1
• Level 1-2
• Level 2-3
• Level 3-4

OasisCTF

• OasisCTF Notes

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PicoCTF

• Binary Exploitation
• Cryptography
• Forensics
• Reverse Engineering
• Web Exploitation

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PWN College

1. Hello Hackers

• Introduction to Commands
• Introduction to Arguments

2. Pondering Paths

• The Root
• Program and Absolute Paths
• Position Thy Self
• Position Elsewhere
• Position Yet Elsewhere
• Implicit Relative Paths, From
• Explicit Relative Paths, From
• Implicit Relative Path
• Home Sweet Home

3. Comprehending Commands

• Cat, Not the Pet but the Command
• Catting Absolute Paths
• More Catting Practice
• Grepping for a Needle in a Haystack
• Listing Files
• Touching Files
• Removing Files
• Hidden Files
• An Epic Filesystem Quest
• Making Directories
• Finding Files
• Linking Files

4. Digesting Documentation

• Learning from Documentation
• Learning Complex Usage
• Reading Manuals
• Searching Manuals
• Searching for Manuals
• Helpful Programs
• Help for Builtins

5. File Globbing

• Matching with *
• Matching with ?
• Matching with Ranges
• Matching Paths
• Mixing Globs
• Exclusionary Globbing

6. Practicing Piping

• Redirecting Output
• Redirecting More Output
• Appending Output
• Redirecting Errors
• Redirecting Input
• Grepping Stored Results
• Grepping Live Output
• Grepping Errors
• Duplicating Piped Data with Tee
• Writing to Multiple Programs
• Split-piping stderr and stdout

7. Shell Variables

• Printing Variables
• Setting Variables
• Multi-word Variables
• Exporting Variables
• Printing Exported Variables
• Storing Command Output
• Reading Input
• Reading Files

8. Processes and Jobs

• Listing Processes
• Killing Processes
• Interrupting Processes
• Suspending Processes
• Resuming Processes
• Backgrounding Processes
• Foregrounding Processes
• Starting Backgrounded Processes
• Process Exit Codes

9. Perceiving Permissions

• Changing File Ownership
• Groups and Files
• Fun with Groups Names
• Changing Permissions
• Executable Files
• Permission Tweaking Practice
• Permissions Setting Practice
• The SUID Bit

10. Untangling Users

• Becoming root with su
• Other users with su
• Cracking passwords
• Using sudo

11. Chaining Commands

• Chaining with semicolons
• Your first shell script
• Redirecting Script Output
• Executable Shell Scripts

12. Pondering PATH

• The PATH variable
• Setting PATH
• Adding commands
• Hijacking commands