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Microsoft Windows XP IIS URL Request Handling Vulnerability
Secunia Advisory: SA18106
Release Date: 2005-12-19
Last Update: 2007-07-10
Popularity: 21,737 views

Critical:
Highly critical
Impact: DoS
System access
Where: From remote
Solution Status: Vendor Patch

OS:Microsoft Windows XP Professional

Software:Microsoft Internet Information Services (IIS) 5.x

Binary Analysis: BA177 :: Available for 1 Credit

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CVE reference:CVE-2005-4360


Description:
Inge Henriksen has discovered a vulnerability in Microsoft Internet Information Services (IIS), which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.

The vulnerability is caused due to a boundary error in the Internet Information Services 5.1 URL parser and can be exploited via a specially crafted URL request.

Example:
http://[host]/[dir]/.dll/%01~0

Successful exploitation requires that "[dir]" is a virtual directory configured with "Scripts & Executables" execution permissions.

NOTE: IIS will automatically restart after a crash.

Solution:
Apply patches.

Microsoft Internet Information Services (IIS) 5.1:
http://www.microsoft.com/downloads/de...=fccbfe90-f838-47df-8310-352e2fb47132

Provided and/or discovered by:
Originally reported as a DoS by Inge Henriksen.

Additional information provided to Microsoft by Watchfire.

Changelog:
2007-07-10: Added additional information about code execution vector. Updated "Solution" section.

Original Advisory:
MS07-041 (KB939373):
http://www.microsoft.com/technet/security/Bulletin/MS07-041.mspx

Inge Henriksen:
http://ingehenriksen.blogspot.com/2005/12/microsoft-iis-remote-dos-dll-url.html


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