Solved

BEAST attack PCI pen tests failing on 2003 web servers

Posted on 2013-01-06
6
420 Views
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
0
Comment
Question by:macleandata
  • 3
  • 2
6 Comments
 
LVL 20

Accepted Solution

by:
netcmh earned 500 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.
0
 

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
0
 

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
0
 
LVL 20

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.
0
 
LVL 20

Expert Comment

by:netcmh
ID: 39942185
Thank you.
0

Featured Post

Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Envision that you are chipping away at another e-business site with a team of pundit developers and designers. Everything seems, by all accounts, to be going easily.
In 2017, ransomware will become so virulent and widespread that if you aren’t a victim yourself, you will know someone who is.
How to create a custom search shortcut to site-search Experts Exchange using Google in the Firefox browser. This eliminates the need to type out site:experts-exchange.com whenever you want to search the site. Launch your Bookmark Menu: Press 'Ctrl +…
With the advent of Windows 10, Microsoft is pushing a Get Windows 10 icon into the notification area (system tray) of qualifying computers. There are many reasons for wanting to remove this icon. This two-part Experts Exchange video Micro Tutorial s…

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question