Index Server 2.0 is a utility included in the NT 4.0 Option Pack.
The functionality provided by Index Server has been built into Windows 2000 as
When combined with IIS, Index Server and Indexing Services include the
ability to view web search results in their original context. It will generate
an HTML page showing the query terms in a short excerpt of the surrounding
text for each page returned, along with a link to that page. This is known
as Hit Highlighting. To do this, it supports the .htw filetype which is handled
by the webhits.dll ISAPI application. This dll will allow the use of
the '../' directory traversal string in the selection of a template
file. This will allow for remote, unauthenticated viewing of any file on the system
whose location is known by the attacker.
The original patch released for this issue still discloses
'include' file types. 'include' files contain various
data (parameters or code) which assist in the execution of program files.