** Inge Henriksen Security Advisory - Full Disclosure Proof of Concept at http://ingehenriksen.blogspot.com/ **
Microsoft IIS Remote Denial of Service (DoS) .DLL Url exploit
16. Desember 2005
Microsoft® Internet Information Server® V5.1
Microsoft® Internet Information Server® V5.0
Microsoft® Internet Information Server® V6.0
Inge Henriksen (inge.henriksen (at) booleansoft (dot) com [email concealed]) http://ingehenriksen.blogspot.com/
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.
Block all incoming URL's containing "~0", "~1", "~2", "~3", "~4", "~5", "~6", "~7", "~8", or "~9"
Full Disclosure Proof of Concept at http://ingehenriksen.blogspot.com/