Exploit-DB #32780
Description: PyCrypto ARC2 Module - Remote Buffer Overflow
Type: remote
Platform: linux
Date: 2009-02-07
Author: Mike Wiacek

Exploit:
source: https://www.securityfocus.com/bid/33674/info

PyCrypto (Python Cryptography Toolkit) is prone to a buffer-overflow vulnerability because it fails to adequately verify user-supplied input.

Successful exploits may allow attackers to execute arbitrary code in the context of applications using the vulnerable module. Failed attempts may lead to a denial-of-service condition.

# -*- coding: utf-8 -*-
#
#  SelfTest/Cipher/ARC2.py: Self-test for the Alleged-RC2 cipher
#
# =======================================================================
# Copyright (C) 2008  Dwayne C. Litzenberger <dlitz@dlitz.net>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# =======================================================================
#

"""Self-test suite for Crypto.Cipher.ARC2"""

__revision__ = "$Id$"

from common import dict     # For compatibility with Python 2.1 and 2.2

import unittest

# This is a list of (plaintext, ciphertext, key[, description[, extra_params]]) tuples.
test_data = [
    # Test vectors from RFC 2268

    # 63-bit effective key length
    ('[PII_REDACTED]', 'ebb773f993278eff', '[PII_REDACTED]',
        'RFC2268-1', dict(effective_keylen=63)),

    # 64-bit effective key length
    ('ffffffffffffffff', '278b27e42e2f0d49', 'ffffffffffffffff',
        'RFC2268-2', dict(effective_keylen=64)),
    ('[PII_REDACTED]', '30649edf9be7d2c2', '[PII_REDACTED]',
        'RFC2268-3', dict(effective_keylen=64)),
    ('[PII_REDACTED]', '61a8a244adacccf0', '88',
        'RFC2268-4', dict(effective_keylen=64)),
    ('[PII_REDACTED]', '6ccf4308974c267f', '88bca90e90875a',
        'RFC2268-5', dict(effective_keylen=64)),
    ('[PII_REDACTED]', '1a807d272bbe5db1', '88bca90e90875a7f0f79c384627bafb2',
        'RFC2268-6', dict(effective_keylen=64)),

    # 128-bit effective key length
    ('[PII_REDACTED]', '2269552ab0f85ca6', '88bca90e90875a7f0f79c384627bafb2',
        "RFC2268-7", dict(effective_keylen=128)),
    ('[PII_REDACTED]', '5b78d3a43dfff1f1',
        '88bca90e90875a7f0f79c384627bafb216f80a6f85920584c42fceb0be255daf1e',
        "RFC2268-8", dict(effective_keylen=129)),

    # Test vectors from PyCrypto 2.0.1's testdata.py
    # 1024-bit effective key length
    ('[PII_REDACTED]', '624fb3e887419e48', '5068696c6970476c617373',
        'PCTv201-0'),
    ('ffffffffffffffff', '79cadef44c4a5a85', '5068696c6970476c617373',
        'PCTv201-1'),
    ('[PII_REDACTED]', '90411525b34e4c2c', '5068696c6970476c617373',
        'PCTv201-2'),
    ('[PII_REDACTED]', '078656aaba61cbfb', '5068696c6970476c617373',
        'PCTv201-3'),
    ('[PII_REDACTED]', 'd7bcc5dbb4d6e56a', 'ffffffffffffffff', 'PCTv201-4'),
    ('ffffffffffffffff', '7259018ec557b357', 'ffffffffffffffff', 'PCTv201-5'),
    ('[PII_REDACTED]', '93d20a497f2ccb62', 'ffffffffffffffff', 'PCTv201-6'),
    ('[PII_REDACTED]', 'cb15a7f819c0014d', 'ffffffffffffffff', 'PCTv201-7'),
    ('[PII_REDACTED]', '63ac98cdf3843a7a',
        'ffffffffffffffff[PII_REDACTED]477265656e[PII_REDACTED]e5ffe553',
        'PCTv201-8'),
    ('ffffffffffffffff', '3fb49e2fa12371dd',
        'ffffffffffffffff[PII_REDACTED]477265656e[PII_REDACTED]e5ffe553',
        'PCTv201-9'),
    ('[PII_REDACTED]', '46414781ab387d5f',
        'ffffffffffffffff[PII_REDACTED]477265656e[PII_REDACTED]e5ffe553',
        'PCTv201-10'),
    ('[PII_REDACTED]', 'be09dc81feaca271',
        'ffffffffffffffff[PII_REDACTED]477265656e[PII_REDACTED]e5ffe553',
        'PCTv201-11'),
    ('[PII_REDACTED]', 'e64221e608be30ab', '53e5ffe553', 'PCTv201-12'),
    ('ffffffffffffffff', '862bc60fdcd4d9a9', '53e5ffe553', 'PCTv201-13'),
    ('[PII_REDACTED]', '6a34da50fa5e47de', '53e5ffe553', 'PCTv201-14'),
    ('[PII_REDACTED]', '584644c34503122c', '53e5ffe553', 'PCTv201-15'),
]

class BufferOverflowTest(unittest.TestCase):
    # Test a buffer overflow found in older versions of PyCrypto

    def setUp(self):
        global ARC2
        from Crypto.Cipher import ARC2

    def runTest(self):
        """ARC2 with keylength > 128"""
        key = "x" * 16384
        mode = ARC2.MODE_ECB
        self.assertRaises(ValueError, ARC2.new, key, mode)

def get_tests(config={}):
    from Crypto.Cipher import ARC2
    from common import make_block_tests

    tests = make_block_tests(ARC2, "ARC2", test_data)
    tests.append(BufferOverflowTest())

    return tests

if __name__ == '__main__':
    import unittest
    suite = lambda: unittest.TestSuite(get_tests())
    unittest.main(defaultTest='suite')

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