webeasy

Echo

spbctf

Task: Echo service with WAF blocking most shell metacharacters. Solution: Use backtick command substitution to bypass WAF and read the flag file.

$ ls tags/ techniques/

command_injection shell echo waf_bypass backtick

waf_bypassbacktick_command_substitution

Analysis

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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