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Moderately critical

Microsoft Internet Information Services Basic Authentication Security Bypass

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Release Date:  2010-07-02    Last Update:  2010-09-14    Views:  8,328

Secunia Advisory SA40412

Where:

From remote

Impact:

Security Bypass

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Soroush Dalili has discovered a vulnerability in Microsoft Internet Information Services, which can be exploited by malicious people to bypass certain security restrictions.

The vulnerability is caused due to an error in the handling of basic authentication for directories. This can be exploited to bypass authentication and access e.g. protected directories by appending the NTFS stream name and stream type (":$i30:$INDEX_ALLOCATION") to the directory name within a request.


Solution:
Apply patch.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Soroush Dalili

Original Advisory:
MS10-065 (KB2267960, KB2290570):
http://www.microsoft.com/technet/security/bulletin/ms10-065.mspx

Soroush Dalili:
http://soroush.secproject.com/blog/2010/07/iis5-1-directory-authentication-bypass-by-using-i30index_allocation/

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Internet Information Services Basic Authentication Security Bypass

User Message
RichardD RE: Microsoft Internet Information Services Basic Authentication Security Bypass
Member 5th Jul, 2010 14:29
Score: 7
Posts: 5
User Since: 4th Mar 2010
System Score: N/A
Location: UK
Last edited on 5th Jul, 2010 14:29
Looks like URLScan blocks this vulnerability by default. I've just tried the URL against one of our old Windows 2000 servers, and it gives me a 404 error.
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shinnai RE: Microsoft Internet Information Services Basic Authentication Security Bypass
Member 7th Jul, 2010 12:05
Score: 7
Posts: 4
User Since: 11th Jan 2008
System Score: N/A
Location: IT
Last edited on 7th Jul, 2010 12:05
I can confirm what RichardD said. I've followed step by step the paper written by Soroush Dalili and I just get a 404 error. Where am I wrong?
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taffy078 RE: Microsoft Internet Information Services Basic Authentication Security Bypass
Contributor 7th Jul, 2010 14:12
Score: 410
Posts: 1,280
User Since: 26th Feb 2009
System Score: 100%
Location: UK
Hi Shinnai, and welcome to this forum..

Being new, you won't be aware that this section, “ Vulnerabilities”, is used by the Secunia team to announce problems.

You will have more chance of getting help, more quickly, if you post a new thread in one of the other sections (see the list on the left).

If you do, it will help us help you if you give details of your system etc - as I have done, below.

Best wishes.


--
taffy078, West Yorkshire, UK

Desktop: Compaq Presario (OEM) 32 bit / AMD Athlon / 2 GB RAM
XP Home - SP3/ IE8/ Norton IS - Secunia PSI v2.0.0.3003

Laptop: Win 7 / IE11 / PSI v2.0.0.3003
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shinnai RE: Microsoft Internet Information Services Basic Authentication Security Bypass
Member 7th Jul, 2010 17:23
Score: 7
Posts: 4
User Since: 11th Jan 2008
System Score: N/A
Location: IT
Last edited on 7th Jul, 2010 17:23
taffy078 thanks a lot and sorry for my mistake
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