Solved

BEAST attack PCI pen tests failing on 2003 web servers

Posted on 2013-01-06
6
425 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

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

Provide an easy one stop to quickly get the relevant information on common asked question on Ransomware in Expert Exchange.
When the confidentiality and security of your data is a must, trust the highly encrypted cloud fax portfolio used by 12 million businesses worldwide, including nearly half of the Fortune 500.
This Micro Tutorial will demonstrate how nuggets on the Web are formatted by using Chrome Developer Tools. These tools would not only view the site's CSS but it can also modify it and save the CSS to use on your own site.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

733 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