Rule: -- Sid: 1487 -- Summary: This event is generated when an attempt is made to request an HTTP-based password change. -- 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. -- 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. -- Affected Systems: Microsoft IIS 4.0 -- Attack Scenarios: An attacker can request password changes to discover existing accounts or brute force password changes. -- Ease of Attack: Simple. -- False Positives: None Known. -- False Negatives: None Known. -- Corrective Action: Remove the IISADMPWD virtual directory to disable remote password changes. Consider running the IIS Lockdown Tool to disable HTR functionality. -- Contributors: Original rule writer unknown Modified by Brian Caswell <bmc@sourcefire.com> Sourcefire Research Team Judy Novak <judy.novak@sourcefire.com> -- Additional References: CVE http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-1999-0407 Bugtraq http://www.securityfocus.com/bid/2110 --
