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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


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Vulnerability Assessment Details

Test Microsoft IIS Source Fragment Disclosure

Vulnerability Assessment Summary
Test Microsoft IIS Source Fragment Disclosure

Detailed Explanation for this Vulnerability Assessment

Microsoft IIS 4.0 and 5.0 can be made to disclose
fragments of source code which should otherwise be
inaccessible. This is done by appending +.htr to a
request for a known .asp (or .asa, .ini, etc) file.

Solution : .htr script mappings should be removed if not required.

- open Internet Services Manager
- right click on the web server and select properties
- select WWW service | Edit | Home Directory | Configuration
- remove the application mappings reference to .htr

If .htr functionality is required, install the relevant patches
from Microsoft (MS01-004)
See also: http://www.microsoft.com/technet/security/bulletin/MS01-004.mspx
Network Security Threat Level: High

Networks Security ID: 1193, 1488

Vulnerability Assessment Copyright: This script is Copyright (C) 2001 Pedro Antonio Nieto Feijoo

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