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MICROSOFT IIS AUTHENTICATION ERROR INFORMATION DISCLOSURE - NTLM AUTHENTICATION

Posted on 2009-05-12
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Last Modified: 2012-05-06
Hello,

The results of several of our computers are reflecting this error message from a recent penetration test: MICROSOFT IIS AUTHENTICATION ERROR INFORMATION DISCLOSURE - NTLM AUTHENTICATION.
The only Fix Info. it gives that hosts running IIS 4 through 5.1 are properly configured and only authentication systems necessary for the environment are enabled.

My question: How and what settings need to be properly configured. I do not know what the settings need to be set at to make this risk go away. I have googled this for about 2 hours and really have not found anything.

Your assistance is greatly appreciated.
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Question by:Dreams_of_skill
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jahboite earned 250 total points
ID: 24372957
The correct fix for this information disclosure vulnerability, which is described fully in any of the top results of a google search for the error message you posted, depends on whether you require any part of the website in question to be protected by an authentication system (e.g. username and password).

If those parts of the website you want protected are done so using a custom login form and sessions then you can safely disable Windows Integrated Authentication (i.e. stop using NTLM auth).  There's a microsoft kb article at http://support.microsoft.com/kb/837139 which details the steps.

Before you do this, you need to be sure that the integrated auth is not currently protecting something you don't want to allow anonymous access to.
After you've done it, you'll want to re-run the pentest/vulnerability scan to make sure you caught the issue.

Let us know how you get on.
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by:cj_1969
ID: 24374293
Basically there are multiple types/levels of NTLM authentication (LM, NTLMv1 and NTLMv2) and the older versions of it are unsecure.
Windows has a registry value in a range of 1-5 for the NTLM compatibility level.  To force an acceptable authentication level this value should be set to 3-5, 5 being the best.

This article describes the problem and details the various levels ... http://support.microsoft.com/kb/147706 
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Expert Comment

by:npglobal
ID: 25701088
how can i ndo check this issue  " TLM Auth Information Disclosure"
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