Vulnerability to OpenSSL FREAK attack

Rule from ssl under security category

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FREAK (Factoring RSA-EXPORT Keys) is a Man-in-the-middle vulnerability discovered by a group of cryptographers at INRIA, Microsoft Research and IMDEA.

The vulnerability dates back to the 1990s, when the US government banned selling crypto software overseas, unless it used export cipher suites which involved encryption keys no longer than 512-bits.

The attack usses the fact that some modern browser clients had (and have on older version) a bug in them, where the bug caused the browser to accept export-grade RSA even if they did not request or broadcasted support. Allowing attackers to downgrade the level of security on a connection provided that the client is vulnerable and the server supports export RSA.

How do I fix this ?

Upgrade OPENSSL on the server along with negating the EXPORT cipher suite, a starting point for a list of safe ciphers would be:

Take note of the !EXPORT keyword, disabling export-grade RSA.


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