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Alternatively, if you only wish to allow only a single user (say cgiguru) to develop CGI scripts, you can set the file and directory permission as follows:

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Here the user cgiguru owns the directory and the group (specified by Group directive) used for Apache server is the group owner of the directory and its files Finally, the log directory used in the CustomLog and ErrorLog directives should only be writable by the root user Recommended permission setting for such directory (say /www/logs) is as follows:

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Do not allow anyone (including the Apache user or group) to read, write, or execute files in the log directory specified in CustomLog and ErrorLog directives

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Always make sure that you take a minimalist approach to allowing access to new directories that are accessible via the Web Also ensure that you do not allow Web visitors to view any directory listings You can hide your directory listings using the methods discussed later

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Whenever a user requests access to a directory via the Web, Apache does one of the following: 1 Checks whether the directory is accessible If it is, it continues; otherwise, it displays an error message 2 After it has determined that the directory is accessible, it looks for the directory index file specified by using the DirectoryIndex directive By default, this file is indexhtml If it can read this file in the requested directory, the contents of the file are displayed In the event that such a file does not exist, Apache checks whether it can create a dynamic listing for the directory If it is allowed to create a dynamic listing, it creates it and displays the contents of the directory to the user Because an Apache-created dynamically generated directory listing provides potential bad guys with clues about your directory structure, you should not allow such listings The simplest way to avoid creating a dynamic directory listing is to create a file with the filename specified in DirectoryIndex directive For example, if you set DirectoryIndex as follows:

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Apache will first look for indexhtml in the requested directory of the URL, and then it will look for indexhtm if indexhtml is missing However, a common reasons why many Web sites have exposed directories is that when the new directory is created, the creator forgets to create the index file or uploads an index file with the wrong case, such as INDEXHTML or INDEXHTM

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If this happens frequently, you can use a CGI script to automatically redirect users to your home page or to an internal search engine interface Simply modify the DirectoryIndex directive to be:

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#!/usr/bin/perl # # Purpose: this script is used to redirect # users who enter a URL that points to # directories without indexhtml page # use CGI qw(:standard); # Set the automatically redirect URL my $AUTO_REDIRECT_URL = / ; # Get the current URL path my $curDir = $ENV{REQUEST_URI}; # If the current URL path is not home page (/) then # redirect user to home page if ($curDir ne / ){ print redirect($AUTO_REDIRECT_URL); # # # } } exit 0; If the home page is also missing the index page, we can t redirect back to home page (to avoid recursive redirection), so display an error message else { print header; print HOME PAGE NOT FOUND! ;

Summary

Table 83 The number of mean decrease (M ) attack characteristics (variables) by Windows performance objects and attacks Attacks Distributed 2 1 3 2 2 2 1 1 12 5 1 4 7 1 5 1 1 8 9 Fork FTP Hardware Remote Rootkit Security Software Vulnerability

This script runs after Apache fails to find the directory index files (indexhtml or indexhtm) The script simply redirects a user whose URL points to a directory with no index file to the Web site s home page

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Make sure to change /cgi-bin/ from the path of the above directive if you use a different alias name If you do not wish to display any directory listings at all, you can simply disable directory listing by setting the following configuration:

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