| GEN:SID | 1:996 |
| Message | WEB-IIS anot.htr access |
| 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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| 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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| Additional References | CVE http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-1999-0407
Bugtraq http://www.securityfocus.com/bid/2110
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| Rule References | bugtraq: 2110
cve: 1999-0407
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