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:
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Subject: Microsoft IIS ASP Code Execution Security Bypass
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