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Python 3.2 and supported OpenSSL Versions

+2 votes
608 views

I have two Questions:

  1. Could Python 3.2, when compiled against OpenSSL 1.0.0j, be affected by the poodle bug? https://www.openssl.org/~bodo/ssl-poodle.pdf

  2. If yes - are the following OpenSSL versions approved for use with Python 3.2:
    OpenSSL 0.9.8zf
    OpenSSL 1.0.0r
    OpenSSL 1.0.1m
    OpenSSL 1.0.2a

posted May 25, 2015 by anonymous

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1 Answer

+1 vote

Yes, POODLE is two things:

  1. Due to client side fallback mechanisms outside of SSL and TLS, it is possible to force a client to connect with a different version of the protocol, i.e. a protocol downgrade.

  2. Due to the way padding is implemented in SSL 3.0 there is a padding oracle attack on CBC mode ciphers. This affects all implementations of SSL 3.0, and some of TLS 1.0 (but not OpenSSL).

All versions of OpenSSL (that support SSL 3.0) are affected by (2) because it is inherent in the protocol. The fix is not to allow SSL, and enable the latest versions of TLS.

Later versions of OpenSSL (0.9.8zc, 1.0.0o, 1.0.1j) added a workaround, the TLS_FALLBACK_SCSV mechanism, which allows clients to specify when they have falled back to an earlier version, preventing downgrade attacks (1). It only works if the both the client and server support the mechanism, and if SSL 3.0 is used it is still affected by the padding oracle attack (2).

2. If yes - are the following OpenSSL versions approved for use with Python 3.2:

I can't answer for approved but I have builds of Python than use OpenSSL 0.9.8 and 1.0.1 and it should build against any version in these branches. I also have pyOpenSSL built against these branches.

answer May 25, 2015 by anonymous
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