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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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IIS .HTR overflow

Vulnerability Assessment Summary Tests for IIS .htr ISAPI filter Detailed Explanation for this Vulnerability Assessment The remote server is vulnerable to a buffer overflow in the .HTR filter. A possible hacker may use this flaw to execute arbitrary code on this host (although the exploitation of this flaw is considered as being difficult). 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. See MS bulletin MS02-028 for a patch Network Security Threat Level: High Networks Security ID: 4855, 5003 Vulnerability Assessment Copyright: This script is Copyright (C) 2002 Renaud Deraison

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