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Microsoft IIS File Extension Processing Security Bypass Vulnerability

VUPEN ID VUPEN/ADV-2009-3634
CVE ID CVE-2009-4444
 
CWE ID Available in VUPEN VNS Customer Area
CVSS V2 Available in VUPEN VNS Customer Area
Rated as Moderate Risk 
Impact Available in VUPEN VNS Customer Area
Authentication Level Available in VUPEN VNS Customer Area
Access Vector Available in VUPEN VNS Customer Area
Release Date 2009-12-24
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Technical Description

A vulnerability has been identified in Microsoft Internet Information Services (IIS), which could be exploited by attackers to compromise a vulnerable system. This issue is caused due to the server handling files with multiple extensions separated by the ";" character e.g. "malicious.asp;.jpg" as ASP pages, which could allow attackers to execute arbitrary code on a vulnerable web server by uploading a malicious file bypassing file extension protections and restrictions.

Affected Products

Microsoft Internet Information Services (IIS) version 6.0

Solution 

Remove "execute" permissions from the upload folders.

VUPEN Security is not aware of any vendor-supplied patch.

References

http://www.vupen.com/english/advisories/2009/3634
http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf
http://blogs.technet.com/msrc/archive/2009/12/29/results-of-investigation-into-holiday-iis-claim.aspx
http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx

Credits 

Vulnerability reported by Soroush Dalili.

Changelog 

2009-12-24 : Initial release
2009-12-29 : Updated References

Feedback 

If you have additional information or corrections for this security advisory please submit them via our contact form.

 

Monthly Statistics 

 

 VUPEN Security Advisories By Criticality: Aug 2010


  Critical Risk

: 0%

  High Risk
: 0%

  Moderate Risk
: 0%

  Low Risk
: 100%

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