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CVE-2011-3389 - general HTTPS: block-wise chosen-plaintext attack against SSL/TLS ("BEAST" attack) (Bug #101192)

Product

SteelHead Interceptor

Fixed in Version:

RBT IC 3.0.0c, interceptor 3.0.0c

Last Modified:

2015-05-13

Summary

Details:

The SSL protocol encrypts data by using CBC mode with chained initialization vectors, which allows man-in-the-middle attackers to obtain plaintext HTTP headers via a blockwise chosen-boundary attack (BCBA) on an HTTPS session, in conjunction with JavaScript code that uses the HTML5 WebSocket API, the Java URLConnection API, or the Silverlight WebClient API, aka a "BEAST" attack.

Fix:

Disabling the default OpenSSL flag SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS elimates the condition under which this attack succeeds. We have disabled this flag in our OpenSSL configuration.

Recommendation:

Upgrade to patched version if applicable.

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