[Python-Dev] Challenge: Please break this! (a.k.a restricted mode revisited)

[Jon Ribbens]

On Tue, Apr 12, 2016 at 02:31:19PM +0200, Victor Stinner wrote:
> Oh, I forgot to mention another vulnerability: you block access to
> attributes by replacing getattr and by analyzing the AST. Ok, but one
> more time, it's not enough. If you get access to obj.__dict__, you
> will likely get access to any attribute using obj_dict[attr] instead
> of obj.attr.

That's not a vulnerability, and it's something I already explicitly
mentioned - if you can get a function to return an object's __dict__
then you win. The question is: can you do that?