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Microsoft IIS Remote Denial of Service (DoS) .DLL Url exploit |
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Sunday, 18 December 2005 |
Advisory Name:
Microsoft IIS Remote Denial of Service (DoS) .DLL Url exploit
Release Date:
16. Desember 2005
Vulnerable:
Microsoft® Internet Information Server® V5.1
Not vulnerable:
Microsoft® Internet Information Server® V5.0
Microsoft® Internet Information Server® V6.0
Severity:
High
Discovered by:
Inge Henriksen (
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) http://ingehenriksen.blogspot.com/
Vendor Status:
Notified 28. January 2005. No fix will be released until Microsoft® Windows® XP Service Pack 3
(Rumored due late 2006).
Description:
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 "/_vti_bin" and the like.
Suggested solution:
Block all incoming URLs containing "~0", "~1", "~2", "~3", "~4", "~5", "~6", "~7", "~8", or "~9"
(Ignore quotes).
Full Disclosure Proof of Concept at http://ingehenriksen.blogspot.com/
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