Check how the challenge was created on @LiveOverflow channel:

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This video is a solution of Amazing Crypto WAF challenge from ALLES! CTF. The task was created by one of the most popular YouTubers in our industry – LiveOverflow. The solution involved bypassing WAF (Web Application Firewall), exploiting blind SQL injection and decrypting the flag.

Exploit code:

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00:00 Intro
00:47 See how the challenge is built
01:40 Detecting the SQL injection
03:20 Bypassing the WAF
05:30 Constructing the SQL query
06:33 Decrypting the flag
08:14 Exfiltrating the data using blind SQL injection

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