Remove eval from cli

[152334H]

Removal eval()

POC

$ pwn shellcraft amd64.crash --address '__import__("os").system("echo hi")'
hi
5f5e5d5b5b5a59584831e4ffe4

safeeval is used elsewhere in pwntools, so it may be helpful to replace the use of eval() here with safeeval.expr().

The above test case will (correctly) raise an error when eval() is replaced:

Traceback (most recent call last):
...
    raise ValueError("opcode %s not allowed" % dis.opname[code])
ValueError: opcode LOAD_NAME not allowed

And will run as normal with a proper address:

$ pwn shellcraft amd64.crash --address '0x123'
5f5e5d5b5b5a59584831e4ffe4

Testing

I am struggling to find where to put doctests for this, if they are necessary.

Changelog

Making after PR.

P.S.: I made use of this bug for a local CTF I ran with a few others. You can see the challenge here while it's still up.

[Arusekk]

Alright, this came from 11fa0d8 so quite a while ago; but I believe this is not a threat huge enough to be worth backporting.