IIS4 Absent Directory Browser Argument Vulnerability Patch

Publisher's description

From Microsoft :

From the developer:

"There are two vulnerabilities at issue:

• The 'Absent Directory Browser Argument' vulnerability. An administrative script installed as part of IIS 3.0 but preserved on upgrade to IIS 4.0 or IIS 5.0 does not correctly handle the case where an expected argument is missing. The absence of the argument causes the script to go into an infinite loop, at which point the script consumes all CPU resources on the server. In addition, the permissions on this tool and several related ones, which were appropriate under IIS 3.0, are inappropriate under IIS 4.0 and 5.0. This could allow web site visitors to use these tools, which provide the ability to view the directory structure on the server.

• A new variant on the 'File Fragment Reading via .HTR' vulnerability. The original version of this vulnerability was discussed in Microsoft Security Bulletin MS00-031. The new vulnerability differs only in the specific way that it could be exploited – like the original version, the effect of the vulnerability is that fragments of .ASP and other files could potentially be retrieved from the server. As in the original version, the mechanics of the new variant make it likely that the parts of an .ASP file most interesting to a malicious user would be stripped out.

Microsoft has released this patch which eliminates both of these vulnerabilities."

Note: The patch should only be installed by customers who have a business-critical need for the .HTR functionality. Microsoft recommends that all other customers disable the .HTR functionality altogether, as discussed in the FAQ. Customers who choose to install the patch should also strengthen the permissions on the /scripts/iisadmin folder in each web site on the server, and ensure that only administrators can access it.

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