MS12-006: Vulnerability in SSL/TLS Could Allow Information Disclosure (2643584)
Medium Nessus Plugin ID 57474
Synopsis
It may be possibe to obtain sensitive information from the remote Windows host using the Secure Channel security package.
Description
The remote host is affected by an information disclosure vulnerability, known as BEAST, in the SSL 3.0 and TLS 1.0 protocols due to a flaw in the way the initialization vector (IV) is selected when operating in cipher-block chaining (CBC) modes. A man-in-the-middle attacker can exploit this to obtain plaintext HTTP header data, by using 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.
TLS 1.1, TLS 1.2, and all cipher suites that do not use CBC mode are not affected.
Solution
Microsoft has released a set of patches for XP, 2003, Vista, 2008, 7, and 2008 R2.