Edit Report

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Below is a copy:

** Inge Henriksen Security Advisory - Full Disclosure Proof of Concept at **

Advisory Name: 
Microsoft IIS Remote Denial of Service (DoS) .DLL Url exploit

Release Date: 
16. Desember 2005

Microsoft® Internet Information Server® V5.1

Not vulnerable: 
Microsoft® Internet Information Server® V5.0 
Microsoft® Internet Information Server® V6.0


Discovered by: 
Inge Henriksen (inge.henriksen (at) booleansoft (dot) com [email concealed])

Vendor Status: 
Notified 28. January 2005. No fix will be released until Microsoft® Windows® XP Service Pack 3 
(Rumored due late 2006).

I have found that by doing a malformed anonymous HTTP request one can remotely crash the IIS service 
process, inetinfo.exe, using just a simple tool like a web browser. The vulnerablity is only present 
in folders with Execute Permissions set to Scripts & Executables, examples of vulnerable virtual 
folders would be "<webroot>/_vti_bin" and the like.

Suggested solution:
Block all incoming URL's containing  "~0", "~1", "~2", "~3", "~4", "~5", "~6", "~7", "~8", or "~9" 
(Ignore quotes).

Full Disclosure Proof of Concept at

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