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BEAST attack PCI pen tests failing on 2003 web servers

Posted on 2013-01-06
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Last Modified: 2014-03-20
Hi guys,

We have failed our monthly pen test which relates to the BEAST attack on CBC ciphers.  I have read numerous articles and recommendations, and I think I know what needs to be done, but I just need someone to confirm this.

Affected systems are all web servers Windows 2003 IIS6 (yes getting on now I know)
From the copious amounts of reading and trying to understand the relationship between the protocols and ciphers i.e. is there one pool of ciphers which all the enabled protocols use etc. I think I need to disable all weak ciphers + ciphers that have CBC written in the description.  This leaves just 2 ciphers - TLS_RSA_WITH_RC4_128_SHA & TLS_RSA_WITH_RC4_128_MD5 which if my understanding is correct, both SSL3.0 and TLS1.0 will use?!?!

On the Trustwave report, it states that to disable all Block based ciphers and to only support RC4 ciphers. But when using IIS Crypto to leave only RC4 128/128 ticked in the ciphers list, and using Qualys SSL labs to check the available cipher lists, it still shows a few CBC ciphers.  So I have removed these from within the Schannel which leaves only - TLS_RSA_WITH_RC4_128_SHA & TLS_RSA_WITH_RC4_128_MD5

As these web servers are accessed by thousands of customers, I just need to be sure I have understood correctly what’s needed to be able to pass the pen test.

Many thanks in advance.

Regards,

James
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Question by:macleandata
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6 Comments
 
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Accepted Solution

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netcmh earned 2000 total points
ID: 38749429
Well, RFC2246 confirms the ciphersuite with TLS1.0 and I believe that SSL3.0 will also support the streaming cipher. Upgrading your webserver will enable you to leverage the enhancements that IIS6 was never designed for.
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Author Comment

by:macleandata
ID: 38750078
Hi,

Thanks for your comment.  We are planning to upgrade later this year, but in the meantime I need to have a solution in place as soon as possible.As we stand, I just need to confirm the above to cipher suite are the only ones I can have enabled on 2003 server side.

Many thanks netcmh
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Author Comment

by:macleandata
ID: 39934039
I've requested that this question be closed as follows:

Accepted answer: 0 points for macleandata's comment #a38750078

for the following reason:

No solution was given so wanted to close the call
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LVL 21

Expert Comment

by:netcmh
ID: 39934040
A confirmation on my part in regards to the question supported by an RFC was provided. No additional experts participated. A business solution was out of scope for the question.
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Expert Comment

by:netcmh
ID: 39942185
Thank you.
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