RSA BSAFE Micro Edition Suite contains updates designed to prevent BEAST attacks. There is a known vulnerability in SSLv3 and TLS v1.0 to do with how the Initialization Vector (IV) is generated. For symmetric key algorithms in CBC mode, the IV for the first record is generated using keys and secrets set during the SSL or TLS handshake. All subsequent records are encrypted using the ciphertext block from the previous record as the IV. With symmetric key encryption in CBC mode, plain text encrypted with the same IV and key generates the same cipher text, which is why having a variable IV is important. The BEAST exploit uses this SSLv3 and TLS v1.0 vulnerability by allowing an attacker to observe the last ciphertext block, which is the IV, then replace this with an IV of their choice, inject some of their own plain text data, and when this new IV is used to encrypt the data, the attacker can guess the plain text data one byte at a time.
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