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https://github.com/ytdl-org/youtube-dl
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4d318be195
The rsa_verify code was vulnerable to a BB'06 attack, allowing to forge signatures for arbitrary messages if and only if the public key exponent is 3. Since the updates key is hardcoded to 65537, there is no risk for youtube-dl, but I don't want vulnerable code in the wild. The new function adopts a way safer approach of encoding-and-comparing to replace the dangerous parsing code.
31 lines
1.1 KiB
Python
31 lines
1.1 KiB
Python
#!/usr/bin/env python
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from __future__ import unicode_literals
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# Allow direct execution
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import os
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import sys
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import unittest
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sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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import json
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from youtube_dl.update import rsa_verify
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class TestUpdate(unittest.TestCase):
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def test_rsa_verify(self):
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UPDATES_RSA_KEY = (0x9d60ee4d8f805312fdb15a62f87b95bd66177b91df176765d13514a0f1754bcd2057295c5b6f1d35daa6742c3ffc9a82d3e118861c207995a8031e151d863c9927e304576bc80692bc8e094896fcf11b66f3e29e04e3a71e9a11558558acea1840aec37fc396fb6b65dc81a1c4144e03bd1c011de62e3f1357b327d08426fe93, 65537)
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with open(os.path.join(os.path.dirname(os.path.abspath(__file__)), 'versions.json'), 'rb') as f:
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versions_info = f.read().decode()
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versions_info = json.loads(versions_info)
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signature = versions_info['signature']
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del versions_info['signature']
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self.assertTrue(rsa_verify(
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json.dumps(versions_info, sort_keys=True).encode('utf-8'),
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signature, UPDATES_RSA_KEY))
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if __name__ == '__main__':
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unittest.main()
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