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The rules are not visible in a normal GUI because they should not be modified. If you need to add rules for custom services, the right way is using COM scripting tools. See http:// blogs.technet.com/voy/archive/2007/04/02/network-restrictions-for-service-hardening.aspx for more details and scripting examples. The rules are considered static because they apply whether or not the firewall is enabled and over all three firewall profiles. Also, they can only be used to restrict access, not to grant it. Microsoft s new focus on extending domain isolation to services will only increase the resilience of Windows to network attacks. Several attacks, including the Blaster worm, would have been prevented or minimized had these firewall rules been in effect at the time. Also, if someone tells you that Windows Firewall doesn t have any outbound blocking turned on by default, you can show them the dozens of rules in effect by default.

At the beginning of this chapter I mentioned that all services run in Session 0 on Windows. All user mode applications and programs do not. This serves to prevent users and the programs they run (which might be malware) from easily modifying core services. Since roughly 86 percent of all Windows vulnerabilities reported over the last few years require an end user to be socially engineered into executing code on the desktop (http://www.infoworld.com/article/ 07/10/19/42OPsecadvise-insider-threats_1.html), service session isolation is a very good thing. The one potential downside to Session 0 Isolation is the fact that legacy services expecting to directly interact with the end user can no longer display messages and prompts. Without some sort of shim, a legacy service would display its service message in Session 0, where the end user cannot read it. Microsoft included the Interactive Services Detection (ui0detect) service to allow legacy services to communicate to interactive end users. When started (it is not started by default) the service will detect services trying to communicate with the user and alert the logged-on interactive user. Microsoft has publicly stated that the Ui0detect service is a temporary shim and will be going away in the future. Vendors need to recode their services to communicate to users in different sessions using RPC, COM, Named Pipes, or other communication methods. Find more details on Session 0 Isolation at http:// www.microsoft.com/whdc/system/vista/services.mspx.

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Product A has 200 known bugs, and Product B has 350. Product B also has fewer bugs found by the customer but there isn't really enough data here to say that one product is "buggier" than the other is. What we do know about Product B, however, is which types of activities are finding bugs. Coupled

The Template Categories pane on the left offers a number of ready-made database applications you can customize to fit your own data requirements. The center panel enables you to start a new blank database or choose an online template. The Open Recent Database pane displays any database files you ve used recently and provides a More link you can use to navigate to additional files.

All services by default have the System mandatory integrity level. (See 2, for more detail on integrity levels.) Figure 6-19 shows the labels on several services. Only the TrustedInstaller mandatory integrity level is higher. This allows Windows, using the TrustedInstaller service, to upgrade, install, remove, and replace services, while minimizing the chance that other processes and users can modify services.

As Figure 6-19 also shows, most services are protected with Data Execution Prevention (DEP) and ASLR. DEP mitigates many different types of buffer overflows by attempting to prevent

with data from planning or any tracking of time spent on these tasks, we can begin to know which early detection techniques are most effective, or where improvements might need to be made. Taking Action In addition to the number of issues found by activity, it can be beneficial to know what kinds of issues code reviews are finding. For example, a simple lightweight root-cause analysis of the bugs found by the customer or test team might reveal that detection of a significant portion of those bugs could have occurred through code review and indicate an action of updating checklists or stricter policy enforcement. Furthermore, classifying issues by the type of rework necessary to fix the issue identifies where additional early detection techniques might be implemented. Table 15-5 lists a sample of some common rework items found during code review, along with an example technique that could be used to detect that issue before code review. Table 15-5: Code review issues and Associated Prevention Techniques Open table as spreadsheet Detection/prevention technique(s) Educate development team on available libraries and their use; hold weekly discussions or presentations demonstrating capabilities of libraries. Group code reviews can catch these types of errors while educating all review participants on good design principles.

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nonexecutable memory areas from executing program instructions.. Both DEP and ASLR make it harder for a buffer overflow to find the actual function addresses. Both security mechanisms prevent some types of malicious attacks, and have been successful in putting down other attacks that were successful on previous Windows platforms. Neither can stop all malicious attacks. Developers creating services should make sure their services utilize DEP and ASLR.

Design issue, for example, the design of the implementation is suboptimal or does not solve the coding problem as efficiently as necessary

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