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YouTube

Tsuku CTF Web Challenge Walkthroughs (2025)

CryptoCat via YouTube

Overview

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This video walkthrough guides you through solving three web challenges from the 2025 Tsuku CTF competition. Explore detailed solutions for "len_len" (JSON injection), "flash" (sensitive file disclosure and flawed PRNG implementation), and "YAMLwaf" (YAML injection with WAF bypass). The tutorial includes timestamps for each challenge section, making it easy to navigate to specific exploits. Access accompanying written writeups through the provided link, and join the Discord server for further questions. Perfect for cybersecurity enthusiasts looking to understand web vulnerability exploitation techniques used in competitive CTF environments.

Syllabus

0:00 Intro
0:08 len_len
2:47 flash
8:28 YAMLwaf
12:23 Conclusion

Taught by

CryptoCat

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