/etc/apache2/conf.d/security is in apache2.2-common 2.2.22-13+deb7u6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Disable access to the entire file system except for the directories that
# are explicitly allowed later.
#
# This currently breaks the configurations that come with some web application
# Debian packages.
#
#<Directory />
# AllowOverride None
# Order Deny,Allow
# Deny from all
#</Directory>
# Changing the following options will not really affect the security of the
# server, but might make attacks slightly more difficult in some cases.
#
# ServerTokens
# This directive configures what you return as the Server HTTP response
# Header. The default is 'Full' which sends information about the OS-Type
# and compiled in modules.
# Set to one of: Full | OS | Minimal | Minor | Major | Prod
# where Full conveys the most information, and Prod the least.
#
#ServerTokens Minimal
ServerTokens OS
#ServerTokens Full
#
# Optionally add a line containing the server version and virtual host
# name to server-generated pages (internal error documents, FTP directory
# listings, mod_status and mod_info output etc., but not CGI generated
# documents or custom error documents).
# Set to "EMail" to also include a mailto: link to the ServerAdmin.
# Set to one of: On | Off | EMail
#
#ServerSignature Off
ServerSignature On
#
# Allow TRACE method
#
# Set to "extended" to also reflect the request body (only for testing and
# diagnostic purposes).
#
# Set to one of: On | Off | extended
#
TraceEnable Off
#TraceEnable On
#
# Forbid access to version control directories
#
# If you use version control systems in your document root, you should
# probably deny access to their directories. For example, for subversion:
#
#<DirectoryMatch "/\.svn">
# Deny from all
# Satisfy all
#</DirectoryMatch>
#
# Setting this header will prevent MSIE from interpreting files as something
# else than declared by the content type in the HTTP headers.
# Requires mod_headers to be enabled.
#
#Header set X-Content-Type-Options: "nosniff"
#
# Some browsers have a built-in XSS filter that will detect some cross site
# scripting attacks. By default, these browsers modify the suspicious part of
# the page and display the result. This behavior can create various problems
# including new security issues. This header will tell the XSS filter to
# completely block access to the page instead.
# Requires mod_headers to be enabled.
#
#Header set X-XSS-Protection: "1; mode=block"
#
# Setting this header will prevent other sites from embedding pages from this
# site as frames. This defends against clickjacking attacks.
# Requires mod_headers to be enabled.
#
#Header set X-Frame-Options: "sameorigin"
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