| GEN:SID | 1:995 |
| Message | WEB-IIS ism.dll 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 servers that were upgraded from IIS 2 or 3 have a legacy ism.dll file that allows web-based administration. Upon sending a request to ism.dll, the user will be prompted for a userid and password. An attacker can attempt to brute force guess a password, allowing remote access to the server.
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| Affected Systems | Microsoft IIS 4.0 servers upgraded from IIS 2.0 or 3.0
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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 | Upgrade to a more current version of ISS.
Consider running the IIS Lockdown Tool to disable unnecessary functionality.
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| Additional References | CVE http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-1999-1538
Bugtraq http://www.securityfocus.com/bid/189
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| Rule References | bugtraq: 189
cve: 1999-1538
cve: 2000-0630
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