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do this properly requires some understanding of one of the most overlooked aspects of Windows security, security zones Yes, to improve the security of your system, you have to learn how to operate it safely One of the best references for learning about security zones is Microsoft Knowledge Base Article Q174360, available at http://supportmicrosoftcom Also check out the IE Resource Kit, 27, at http://wwwmicrosoftcom/technet/IE/reskit/ie4/part7/part7aasp Essentially, the zone security model allows users to assign varying levels of trust to code downloaded from any of four zones: Local Intranet, Trusted Sites, Internet, and Restricted Sites A fifth zone, called Local Machine, exists, but it is not available in the user interface because it is only configurable using the IE Administration Kit (IEAK, see http:// wwwmicrosoftcom/windows/ieak/en/defaultasp) Sites can be manually added to every zone except the Internet zone The Internet zone contains all sites not mapped to any other zone, and any site containing a period ( ) in its URL (for example, http://local is part of the Local Intranet zone by default, while http://wwwmicrosoftcom is in the Internet zone because it has periods in its name) When you visit a site within a zone, the specific security settings for that zone apply to your activities on that site (for example, Run ActiveX controls may be allowed) Therefore, the most important zone to configure is the Internet zone, since it contains all the sites a user is likely to visit by default Of course, if you manually add sites to any other zone, this rule doesn t apply; be sure to carefully select trusted and untrusted sites when populating the other zones if you choose to do so at all (typically, other zones will be populated by network administrators for corporate LAN users) To configure security for the Internet zone, open Tools | Internet Options | Security within IE (or the Internet Options control panel), highlight the Internet zone, click Default Level, and move the slider up to an appropriate point We recommend setting it to High, and then using the Custom Level button to manually go back and disable all other active content, plus a few other usability tweaks, as shown in Table 16-1.

Popularity: Simplicity: Impact: Risk Rating: 4 4 9 6

Setting Name Script ActiveX controls marked safe for scripting Allow per-session cookies (not stored)

Server Side Includes provide a mechanism for interactive, real-time functionality without programming Web developers will often use them as a quick means of learning the system date/time or to execute a local command and evaluate the output for making a programming flow decision A number of SSI features (called tags) are available, including echo, include, fsize, flastmod, exec, config, odbc, email, if, goto, label, and break The three most helpful to attackers are the include, exec, and email tags A number of attacks can be created by inserting SSI code into a field that will be evaluated as an HTML document by the web server, enabling the attacker to execute commands locally and gain access to the server itself For example, by the attacker entering an SSI tag into a first or last name field when creating a new account, the web server may evaluate the expression and try to run it The following SSI tag will send back an xterm to the attacker:

Comment Do we really need to say more here We d prefer to set this to Prompt, but the perpetual pop-up windows just get too annoying

Problems like this can affect many web application platforms in similar ways For example, PHP applications may contain Remote File Inclusion vulnerabilities if they are improperly configured (see http://enwikipediaorg/wiki/Remote_File_Inclusion) Any time a web server can be directed to process content at an attacker s whim, these kinds of vulnerabilities will occur

Table 16-1

Use a preparser script to read in any HTML file, and strip out any unauthorized SSI line before passing it on to the server Unless your application absolutely, positively, requires it, disable server-side includes and similar functionality in your web server s configuration

Recommended Internet Zone Security Settings (Custom Level Settings Made After Setting Default to High)