Rule:

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Sid:
1487


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Summary:
This event is generated when an attempt is made to request an HTTP-based password change.

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Impact:
Information gathering/remote access.  Error messages from failed password changes can indicate whether a given account exists on the server.  Successful password changes can allow remote access to the server. 

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Detailed Information:
Microsoft Internet Information Services (IIS) Version 4 supplies a feature to allow users to make remote password changes.  The iisadmpwd directory has several .HTR files that are used to implement the password changes.  An attacker can request a change and use a returned form to supply an account name, existing password, and new password either to brute force changes or discover whether a specific account name exist. 

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Affected Systems:
Microsoft IIS 4.0

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Attack Scenarios:
An attacker can request password changes to discover existing accounts or brute force password changes.

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Ease of Attack:
Simple.

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False Positives:
None Known.

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False Negatives:
None Known.

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Corrective Action:
Remove the IISADMPWD virtual directory to disable remote password changes.

Consider running the IIS Lockdown Tool to disable HTR functionality.

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Contributors:
Original rule writer unknown
Modified by Brian Caswell <bmc@sourcefire.com>
Sourcefire Vulnerability Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

CVE
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-1999-0407

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