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TLS/SSL Server is enabling the BEAST attack

Severity CVSS Published Added Modified
4 (AV:N/AC:M/Au:N/C:P/I:N/A:N) September 06, 2011 February 18, 2016 February 18, 2016


The SSL protocol, as used in certain configurations of Microsoft Windows and browsers such as Microsoft Internet Explorer, Mozilla Firefox, Google Chrome, Opera (and other products negotiating SSL connections) encrypts data by using CBC mode with chained initialization vectors. This potentially 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 (1) the HTML5 WebSocket API, (2) the Java URLConnection API, or (3) the Silverlight WebClient API, aka a "BEAST" attack. By supporting the affected protocols and ciphers, the server is enabling the clients in to being exploited.

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