This Ruby code will test a specified Host's SSL certificate against the Debian-based blacklist of keys (RSA 2048 and DSA 1024) generated during the period where openssl on Debian-based installs suffered from a weakness in random number generation. Note that the blacklist is embedded in the code so the file is about 23 MB.
288124a67c707a0fcf89edfbedf7c4788dd853dd55871cba94ecfe308e0ea1aeDebian Security Advisory 1571-1 - Luciano Bello discovered that the random number generator in Debian's openssl package is predictable. This is caused by an incorrect Debian-specific change to the openssl package. As a result, cryptographic key material may be guessable. This is a Debian-specific vulnerability which does not affect other operating systems which are not based on Debian. However, other systems can be indirectly affected if weak keys are imported into them. It is strongly recommended that all cryptographic key material which has been generated by OpenSSL versions starting with 0.9.8c-1 on Debian systems is recreated from scratch. Furthermore, all DSA keys ever used on affected Debian systems for signing or authentication purposes should be considered compromised; the Digital Signature Algorithm relies on a secret random value used during signature generation.
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