Lenard,
Excellent catch. I've removed the 'type' function from the list of safe
builtins. I've also added a test case that demonstrates what you wrote.
"test_misc_type_escape"
http://www.imitationpickles.org/tmp/safe.py
Using what you wrote, I changed it a little and was able to do a 1/0 outside of
the safe_eval, causing a crash.
Thanks!
Phil
Lenard Lindstrom <[EMAIL PROTECTED]> wrote: Phil Hassey wrote:
> Hey,
>
> I've updated the script with some more tests and other goodies.
>
The following program executes code outside safe_eval.
from safe import safe_eval
TestCode = """
def delmethod(self):
print 'I am out.'
foo=type('Foo', (object,), {'_' + '_del_' + '_':delmethod})()
foo.error
"""
try:
safe_eval(TestCode)
finally:
print 'Left safe_eval.'
I can't find any way to exploit this loophole though. But maybe the
__del__ method could be used to exhaust memory in an infinitely
recursive way.
--
Lenard Lindstrom
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