Microsoft IIS Remote Denial of Service (DoS) .DLL Url exploit
** Inge Henriksen Security Advisory - Full Disclosure Proof of Concept at
http://ingehenriksen.blogspot.com/ **
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 (inge.henriksen@xxxxxxxxxxxxxxx)
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 "<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 http://ingehenriksen.blogspot.com/