20 - C++ upgrade - 300 pts

Description
Category: pwnables

They have an update for the vulnerable C++ program trying to fix the bug.
However, the coders at AED suck and introduced another stupid mistake.

Get a shell (and the key, too.)

ssh cpp2_16@a5.amalgamated.biz # R9zcA9FR9ha4hx9vKtmc953D