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Home >> Browse Vulnerability Assessment Database >> Web Servers >> IIS .HTR ISAPI filter applied


Vulnerability Assessment Details

IIS .HTR ISAPI filter applied

Vulnerability Assessment Summary
Tests for IIS .htr ISAPI filter

Detailed Explanation for this Vulnerability Assessment

The IIS server appears to have the .HTR ISAPI filter mapped.

At least one remote vulnerability has been discovered for the .HTR
filter. This is detailed in Microsoft Advisory
MS02-018, and gives remote SYSTEM level access to the web server.

It is recommended that, even if you have patched this vulnerability,
you unmap the .HTR extension and any other unused ISAPI extensions
if they are not required for the operation of your site.

Solution :
To unmap the .HTR extension:
1.Open Internet Services Manager.
2.Right-click the Web server choose Properties from the context menu.
3.Master Properties
4.Select WWW Service -> Edit -> HomeDirectory -> Configuration
and remove the reference to .htr from the list.

In addition, you may wish to download and install URLSCAN from the
Microsoft Technet Website. URLSCAN, by default, blocks all requests
for .htr files.

Network Security Threat Level: High

Networks Security ID: 4474

Vulnerability Assessment Copyright: This script is Copyright (C) 2002 Renaud Deraison

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