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SSL 3.0 and TLS 1.0 BEAST - use TLS 1.1 and/or TLS 1.2?  How?

Posted on 2013-01-17
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We've had a security scan recently and found that SSL 3.0 and TLS 1.0, which is being used on our Exchange server is susceptible by BEAST attacks.  According to MS under this article, http://technet.microsoft.com/en-us/security/bulletin/ms12-006, and several other related KB's for patching or registry key changes should allow for disabling TLS 1.0 and force use of TLS 1.1 or higher.  Though, there are issues with TLS 1.1 and 1.2 which suggests various disadvantages with webpages not connecting/working.  

Anyway, I tried using the patches provided, http://www.microsoft.com/en-us/download/search.aspx?q=kb2585542, but execution of the patch file states that the patch is incompatible with the corresponding server.  Knowing that I downloaded the Windows 2008 server patch and ran it on a Windows 2008 server, I was receiving the error.

I thought that if this key is set to a value of 2, it might prevent the use of the patch indicated above.  So I attempted to look for the schannel registry key, sendextrarecord, it does not exist.

Can someone shed some light on this issue?  I need another set of eyes or some advise on what to do in order to comply with the security measures suggested by the penetration scan/test.  Or if someone can advise if we should even comply with this particular suggestion from the scan?
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Question by:SloanIT
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Expert Comment

by:btan
ID: 38795762
another means is use MBSA to check as advised in the ms12-006, see under Detection and Deployment Tools and Guidance. It states the minimal 2008 baseline to apply the patch eg. 2008 SP2 or 2008 R2 or 2008 R2 SP1.

Subsequent release of KB2643584 was introduced to address the compatibility issues caused by the MS12-006 security patch. To disable SendExtraRecord (set to 2) means the patch applied on the server and the server is exposed to the vulnerability again.

http://blogs.msdn.com/b/kaushal/archive/2012/01/21/fixing-the-beast.aspx
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Author Comment

by:SloanIT
ID: 38799942
I am not sure how this answers the question.  Maybe I am not reading clearly, but it looks as if the server versions that I am using are not tls1.1 or 1.2 compatible.
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LVL 64

Expert Comment

by:btan
ID: 38799952
The mbsa may helps to do the check and the link has the pre- req of I recalled correctly. I will try to do any manual editing in registry. .maybe on staging server first
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SloanIT earned 0 total points
ID: 38866747
turns out that the articles are quite confusing.  The patches for this is already installed.  My two servers, 2003 and 2008 (non r2) does not support anything higher than tls 1.0.
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Author Closing Comment

by:SloanIT
ID: 38879537
called MS technical support and that's what they said
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