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You are here: Home arrow Ethical Hacking Discussions and Related Certificationsarrow Web Applicationsarrow SSL/TLS vulnerability
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Author Topic: SSL/TLS vulnerability  (Read 3181 times)
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Hack_80
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« on: August 26, 2012, 04:20:12 AM »

Hi..

Through Nessus scanner i am finding lost of vulnerability related to SSL/TLS

Vul : SSL/TLS Protocol Initialization Vector Implementation Information Disclosure Vulnerability on w2k3 & 2008 servers as well

I had applied all the mentioned solution from Microsoft of disabling the SSLv2 and TLS 1.but still struggling to fix the same.
Kindly suggest the solutions

Thanks
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Jamie.R
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« Reply #1 on: August 26, 2012, 07:59:57 AM »

You should try and located the nessus nassel script that is identifying the issue and understand why its finding it. As it could be finding the issue in certain way and until you understand how its finding the issue you can not fix it.
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ajohnson
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« Reply #2 on: August 26, 2012, 09:51:56 AM »

http://blog.zoller.lu/2011/09/beast-summary-tls-cbc-countermeasures.html

It looks like prioritizing non-CBC ciphers (RC4) is the way to address this.

There's some more Microsoft-centric discussion here: http://social.technet.microsoft.com/Forums/en-US/winserversecurity/thread/6cc4d577-fb22-4765-ad91-0c4ad46474fd
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Hack_80
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« Reply #3 on: August 28, 2012, 07:11:29 AM »

Hi johnson,
tried the given solution still the vulnerability persist.
Also in tool i find below details of vulnerability

Plugin Output
Negotiated cipher suite: AES128-SHA|TLSv1|Kx=RSA|Au=RSA|Enc=AES(128)|Mac=SHA1

need help to understand the nessus findings
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ajohnson
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« Reply #4 on: August 28, 2012, 07:32:17 AM »

I'm not really familiar with this issue. It's possible that Nessus requires you to disable the ciphers that use AES. If this is a test system, try it out and see what your findings are.

You may need to decide internally if prioritizing RC4 is sufficient, or if eliminating the Nessus finding takes priority.
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