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This new Control Panel application monitors the status of your firewall program, computer updates, and antivirus program; alerts you to possible problems; and provides access to the tools and information you need to fix problems. For details, see Monitoring Windows XP Security, page 170. This replacement for Internet Connection Firewall, which was included in the original version of Windows XP, is eminently more configurable than its predecessor. It protects all network connections LAN (wired and wireless), dial-up, and virtual private network (VPN) and it is enabled for all connections by default from the moment you install SP2. In addition, it protects your computer during startup. For details, see Blocking Intruders with Windows Firewall, page 174.
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Part 2: Keeping Your System Secure
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Automatic Updates, a Control Panel application that manages the download and installation of updates from Microsoft, was overhauled in Service Pack 1; in Service Pack 2, it s revamped again. Likewise, the Windows Update Web site has undergone a facelift to make it easier to use. More importantly, Windows Update, the service that provides security patches, updates, and hardware drivers for Windows and its components, will soon be a part of Microsoft Update, which provides security patches and updates for other Microsoft applications, such as Microsoft Office. When this is fully implemented for all Microsoft applications, Automatic Updates can ensure that high priority updates for all your Microsoft programs are installed promptly.
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In addition, SP2 includes numerous security-related enhancements under the hood. For example:
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The Alerter and Messenger services are disabled by default. These services, which date
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back to the first version of Windows NT, provide a crude form of instant messaging between computers. But in recent years, spammers discovered they could send annoying unsolicited messages over the Internet to computers running the Messenger service.
Data execution prevention (DEP) is implemented as a way to shut down security
exploits that manage to insert and execute code in unexpected memory locations. (This is how many buffer overrun attacks work.) It does this by marking all memory locations used by a process as nonexecutable except those locations explicitly identified as having executable code. If a malicious program attempts to run in a memory location marked as nonexecutable, Windows closes the program. In addition to the software support implemented by Service Pack 2, DEP requires a compatible processor. Intel Itanium processors and Advanced Micro Devices (AMD) processors in the Opteron and Athlon 64 families support DEP. Both companies, along with Transmeta, have announced that other processors released in 2004 or later will also support DEP (sometimes referred to as NX, for no execute). To determine if your computer s processor is compatible with DEP, in Control Panel open System, click the Advanced tab, click Settings in the Performance box, and click the Data Execution Prevention tab. If your processor does not support DEP, a message at the bottom of the dialog box lets you know.
Monitoring Windows XP Security
Your first encounter with the security features included with Service Pack 2 is likely to be a pop-up message from the new Windows Security Center. If you ve just installed the latest version of Windows XP (or just upgraded an older version to SP2), you might see a message like the one shown in Figure 6-2 competing for your attention with the invitations to take a tour of Windows, activate Windows, and get a .NET Passport. This is an indication that Security Center is on the job, monitoring your computer s essential security settings.
Part 2: Keeping Your System Secure
6
Part 1: Part Title
Security Essentials
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Figure 6-2. Warning messages pop up above the Windows Security Alerts icon in the notification area at logon if your computer s security settings need attention.
Clicking the notification area balloon or the icon from which it emanates opens Windows Security Center, a control panel for monitoring and managing the three security essentials: firewall, updates, and antivirus. You can also open Security Center via its icon in Control Panel or by typing wscui.cpl at a command prompt. Figure 6-3 shows the various elements in Security Center.
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