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TITLE:
Microsoft IIS ASP Multiple Extensions Security Bypass

SECUNIA ADVISORY ID:
SA37831

VERIFY ADVISORY:
http://secunia.com/advisories/37831/

DESCRIPTION:
Soroush Dalili has discovered a vulnerability 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 ";", only one internal extension being equal to ".asp"
(e.g. "file.asp;.jpg"). 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.

PROVIDED AND/OR DISCOVERED BY:
Soroush Dalili

ORIGINAL ADVISORY:
http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf

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