Unicode Normalization and Cookie Path Precedence - Solution to February (Valentines) '24 Challenge

🏆 The official writeup for the February '24 Challenge, which involves unicode normalisation (DOMPurify bypass), XSS and cookie manipulation (path precedence). We received 32 valid submissions (and 7 awesome writeups), many of which exploited an unintended race condition 👀 In this video, we'll breakdown the solution 🧠
Full blog/writeup: bugology.intigriti.io/intigri...
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Solve the challenge: challenge-0224.intigriti.io
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🎙️ This show is hosted by / _cryptocat ( ‪@_CryptoCat‬ ) & / intigriti
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00:00 Intro
00:45 Explore site functionality
04:24 Source code review
09:45 Attack plan
11:22 XSS via DOMPurify bypass (unicode normalisation bug)
15:32 Cookie manipulation (path precedence)
18:36 Bonus: unintended solution (race condition)
20:22 Summary
20:51 Conclusion

[@user-cu3mp3lj8f]

Amazing video, so cool challenge as always. Didnt know that cookie path precedence or seen it in the wild :(

[@intigriti]

Thanks! We loved this one as well, I believe GoatSniff got inspiration for the challenge from this talk: th-cam.com/video/njQcVWPB1is/w-d-xo.html - maybe he also found a similar bug before, not sure.

[@nop_i]

Great work!

[@intigriti]

Thank you! 💜

[@camelotenglishtuition6394]

Awesome video! Great work!

[@intigriti]

🙏🥰

[@skideveloper]

Super 🎉

[@KL-og8gg]

dang, I am lost, need to rewatch the video

[@intigriti]

There's definitely a lot going on! Some great writeups here too: bugology.intigriti.io/intigriti-monthly-challenges/0224#community-writeups 🥰

[@sassywoocooo]

Intigriti is my valentine

[@intigriti]

💜💜💜