Assessing IIS Configuration Remotely (Low Level IIS Application Assessment).pdf
Taken from Introduction: A good application security assessment should probe all levels of the environment as well as the custom application itself. In terms of what can be exploited to leverage the greatest access it is of course the application itself, whether through SQL Injection or arbitrary command execution or file access, but defense in depth is by far the best stance to take. As such, this document will look at the relatively unsung skill of assessing the in-depth configuration of a Microsoft IIS web server remotely, showing how to “read” server responses to do this. Hopefully this paper will show how to use two seemingly disparate pieces of information to help determine an attack and therefore assess the associated risk. We will examine ways to determine what permissions have been set on virtual directories used by the application, what authentication options have been left enabled or disabled, what default application extension mappings have been left in place, how to gather information about the server, in terms of physical directory structure, internal IP addresses, computer and Windows NT domain name, anonymous Internet account names and more. Some of this information is relatively old, some fresh, straight out of the NGSSoftware research labs and when combined with a good security analysis of the application code or logic will be able to produce a killer app assessment.
This paper assumes a working knowledge of Microsoft’s IIS and HTTP.
Contents:
- Introduction
- Directory Permissions [ Execute ~ Script ~ Write ~ Read ~ Directory Browsing ]
- IIS Authentication[ Basic ~ NTLM ]
- Information Leakage [ Internal IP Addresses ~ Computer Name ~ Windows NT Domain Name ]
- Default Application mappings
- When a 200 response doesn’t quite mean 200
- IIS on Workstation or Server?
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