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Microsoft IIS ASP Code Execution Security Bypass

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Release Date:  2009-12-24    Last Update:  2010-10-08    Views:  27,783

Secunia Advisory SA37831

Where:

From remote

Impact:

Security Bypass, System access

Solution Status:

Unpatched

CVE Reference(s):

Description


A vulnerability has been discovered in Microsoft Internet Information Services (IIS), which can be exploited by malicious people to potentially bypass certain security restrictions and compromise a vulnerable system.

The vulnerability is caused due to the web server incorrectly executing e.g. ASP code included in a file having multiple extensions separated by ";" (e.g. "file.asp;.jpg") or in a file with an arbitrary extension located in a directory ending with ".asp". This can be exploited to potentially upload and execute arbitrary ASP code via a third-party application using file extensions to restrict uploaded file types.

The vulnerability is confirmed on a fully patched Windows Server 2003 R2 SP2 running Microsoft IIS version 6. Other versions may also be affected.


Solution:
Restrict file uploads to trusted users only and remove "execute" permissions for upload directories.

Provided and/or discovered by:
* Soroush Dalili
* Additional information regarding directories ending with ".asp" provided by Juan Galiana.

Original Advisory:
Soroush Dalili:
http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf

Microsoft:
http://blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspx
http://blogs.technet.com/msrc/archive/2009/12/29/results-of-investigation-into-holiday-iis-claim.aspx
http://blogs.iis.net/nazim/archive/2009/12/29/public-disclosure-of-iis-security-issue-with-semi-colons-in-url.aspx

Juan Galiana:
http://blog.48bits.com/2010/09/28/iis6-asp-file-upload-for-fun-and-profit/

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 IIS ASP Code Execution Security Bypass

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