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Viruses, malware, and spam are major headaches and security risks of the modern network. You can't make them go away, but you can take concrete steps to protect your users and your network. Some of the steps you can take to protect yourself include Install antivirus software on your SBS server. Install anti-malware software on your clients. Install self-updating antivirus software on the SBS server as well as on all clients. There are good antivirus packages that are designed (and priced) for SBS networks and include server, client, and Exchange modules. These packages are often no more expensive than purchasing consumer antivirus software for each client, and provide additional scanning and management capabilities. If you're running SBS Premium Edition, you can also use third-party antivirus and spam filtering plug-ins. SharePoint-specific antivirus software packages are also available. Install self-updating, real-time monitoring, anti-malware software on each client. This doesn't...
A second layer of security on all systems is the antivirus (AV) engine. Implementing a complete security environment requires the use of a comprehensive antivirus solution. This is not a function of Windows Server 2003, but WS03 does offer special application programming interfaces (API) to support file and object scanning on a system. In addition, Microsoft has worked extensively with antivirus manufacturers to ensure that their solutions work well under stress and reliably in any situation. A complete antivirus solution should include the following elements One of the best solutions on the market today is Symantec AntiVirus Corporate Edition from Symantec Corporation It is so simple to deploy that an administrator with no experience in the product can have it deployed and fully functional including automatic update management within a single hour. Once it is deployed, there should be little else to do because it automatically updates all systems. The only thing to do is to make sure...
Laura has previously contributed to the Syngress Publishing's Configuring Symantec Antivirus, Corporate Edition (ISBN 1-931836-81-7). She has also contributed to several other exam guides in the Syngress Windows Server 2003 MCSE MCSA DVD Guide & Training System series as a DVD presenter, contributing author, and technical reviewer. Laura was recently awarded the prestigious MVP award as a Microsoft Most Valued Professional.
You can use software inventory data to effectively manage software in your organization. Software inventory data provides you with important information, such as how many copies of a specific software application exist in your organization or on how many computers in your organization have the latest antivirus program installed. Collected files can help troubleshoot client problems. For example, if a client is experiencing problems, you can open at your desktop a copy of the client's recent log files that were previously collected. The software inventory feature is useful for software distribution. Software inventory data can be used to create collections that are based on file or product data. You can then distribute software to these collections. For example, you might want to distribute an antivirus program only to clients that do not have this program installed.
Install self-updating antivirus software on the Windows Small Business Server 2003 server as well as on all clients. The best way to do this is to use a small-business antivirus package that includes client, server, and Exchange Server virus scanning. This package is often no more expensive than purchasing consumer antivirus software for each client, and it provides additional scanning and management capabilities. Users of Windows Small Business Server 2003, Premium Edition, might want to evaluate ISA Server third-party antivirus and spam filtering plug-ins. Companies that have a lot of remote users connecting to their SharePoint site should also investigate SharePoint antivirus software.
And efficient manner can mean the difference between a well-secured network and a Code Red infestation waiting to happen. In this section, we'll discuss some of the important concepts in hardening client computers, including the importance of antivirus software and patch management.
In a PC-based computing environment. eves small remote offices often require not only domain controllers and file servers , but also e-mail eervers, database servers, and possibly other application servers such as fax servers. An example of a PC-based computing environment in a remote office is shown In Figure 1-2. The remote offices also require associated peripheral software and hardware including netwoek operating systems software, tape backups, tape backup software, antivirus software, network management s oftware, and uninterruptible dower supn lies. Someone needs to administer and maintain these remote networks as well as ensure that data is crrnsistently synchronized or replicated with data at headquarters.
You discovered some traces of a potentially harmful virus on one of the domain controllers. You launch antivirus software, and it reports successful cleanup, but you still observe some Registry keys that belong to the virus code. Which system state restore method is the most appropriate in this situation
Network administrators can solve the problem of enforcing network access requirements on remote computers by using Network Access Quarantine Control. The lack of access for the administrator on remote computers makes enforcing network requirements (such as the use of antivirus software) difficult. It is also not reasonable or scalable to require these checks to be done on a random manual basis. The only way to implement an effective solution is to have the systems do the work for you. By using Windows Server 2003 Resource Kit Tools and the advanced customization features of Connection Manager, network administrators can create connections that check for required programs, registry settings, files, or combinations thereof, and they can quarantine a remote access session until these checks have
Work with each department within the organization to determine their software requirements. Understanding the software needs of the organization helps you identify which software packages need to be rolled out through a GPO. You may need to make some trade-offs. If every user within the organization needs to have a specific application such as antivirus software, it may be easier to create a system image that includes that operating system and the software. Using a third-party disk imaging utility, you can create a generic image of a system that includes all of the software and the appropriate system settings for the organization. Whenever the tech staff builds a new client system, the image is placed on the hard drive of the new computer, and when the computer is rebooted, it is configured with the default settings and software. This is a very quick and usually painless method of getting systems online in short order. However, you will encounter some drawbacks.
You can ensure that clients connecting to TS Gateway meet a benchmark standard of health by using Network Access Protection (NAP). By using NAP, you can ensure that clients connecting through the TS Gateway server have their antivirus and antispyware software up to date. NAP also enables you to ensure that the most recent software updates are present before allowing a connection. In most environments, people connect to TS Gateway from
0 DHCP and Network Access Protection (NAP) are integrated in Windows Server 2008, providing the ability to deny or limit access to network resources based on the client computer's health status. Health status includes having the latest operating system updates and antivirus signatures installed.
Microsoft has built a new type of operating system (OS) with fewer capabilities, which means less code, so the change of an exploit should be minimal. But what are the consequences of stripping an OS so drastically One thing's for sure. Server Core can't easily be used as an application server. The strength of Server Core is to fulfill the key functions of a Windows infrastructure. Think about DHCP, DNS, Active Directory Domain Services, and so on. We don't have balloon notifications, but who will miss them. Wait a minute, though isn't a password expiration a balloon notification Ok, Microsoft missed that one. Also vendors of antivirus, backup, or other agents have some work to do. Agents installed on Server Core cannot have shell or GUI dependencies and may not require managed code. Many of you may be wondering which components are actually there and which components are missing. The following paragraphs will provide you with the answers to these two questions.
Last year, I attended a live demo session from Marcus Murray at Tech-Ed Orlando. The session title was Why I Can Hack Your Network in a Day. According to Marcus, 95 percent of the software running within a company isn't properly patched, and most of the security flaws are caused by this un-patched software. If we look at Server Core, not much software will be installed besides the antivirus and backup software. And maybe you want to keep it this way. Server Core isn't designed to serve as an application platform.
If a computer experiences a hard disk failure, a common practice is to boot to a floppy disk. This can be used for multiple reasons, most of which are valid. For example, an administrator may boot to a floppy and run an antivirus application to verify that a computer is not infected by a boot virus. An administrator can also boot a computer from a floppy to bypass security features that may have been enabled. As the Microsoft NTFS file system has become more popular, new utilities that provide this ability have become more common.
In addition, e-mail messages should be scanned for viruses before they arrive in a user's inbox. Always ensure that antivirus scanning is turned on and is updating its definitions on a regular basis. The combination of content scanning, spam filtering, and virus scanning will help ensure that your e-mail arrives clean of unwanted content and viruses.
Nothing you do matters if you do not have a strategy that considers your network's security. Your carefully conceived and implemented systems can be shut down or otherwise overwhelmed by Denial of Service attacks and malware. Your data can be stolen, modified, deleted, or corrupted because of viruses, accidents, or direct attack. A computer can be remotely controlled by a malicious attacker, your Web site modified, or your company's reputation sullied. Worse, unprotected systems and networks can become the source of attacks on other organizations' systems, on critical national infrastructures such as dams, electric power grids, and so on.
After you install the system, you need to address a few issues pertaining to the installation. First, remember that most of the time, the new system has much in common with the old one as well as many other systems out there. The first common issues for Windows-based systems are the Guest and Administrator accounts. Not only can a hacker try to expose a weakness in this commonality, but also malware-based attacks have been known to use the built-in Administrator account as a potential starting point from which to gain entry to or compromise your system. This is very common these days many of the virus attacks on most corporate networks have depended on this weakness.
A remediation server group, shown in Figure 4-27, is a collection of servers, usually defined by IP address, that noncompliant computers can access . These servers should provide noncompliant client computers with all the resources they need to become compliant. This usually includes servers from which the latest software updates can be downloaded, such as a Windows Software Update Services (WSUS) server as well as servers hosting the latest antivirus and antispyware software and definitions. You can create multiple remediation server groups for example, remediation server groups for each site your company has and then configure different NAP policies to direct noncompliant clients to these groups if the need arises
3 include a default SHA that monitors Windows Security Center settings. This allows the forwarding of data to health policy servers . This data indicates whether the latest updates are installed and whether antivirus and antispyware software are installed and up to date. Third-party vendors can also create their own SHAs that allow the assessment of other elements of client health SHVs are a configurable set of standards against which the NPS server assesses the statement of health forwarded by the client. Figure 4-25 shows the default Windows Security Health Validator for Windows Vista. An administrator can set options that determine how strictly health standards are enforced. For example, some administrators can simply choose to require an antivirus application to be active on the client computer other administrators might allow clients to connect only when the antivirus application is enabled and up to date.
However, antivirus software also has its problems some vendors are better at keeping up to date with the emerging threats, but overall it is next to impossible to protect from malicious code that may have originated within the company's network and is not known to antivirus companies. Administrators can take advantage of software restriction implemented via group policies to allow only certain types of applications, or specific applications, to be executed. Using software restriction policies, administrators define a common security level (either Disallowed or
The CIO has asked you to configure a GPO that will ensure that antivirus software is installed on every computer in the company. You are the most senior administrator in the company and have full access to every computer, and to Active Directory. Your company has a single domain and site. Which one of the following actions do you take
Network Access Protection (NAP) is a platform supported by over 100 independent software vendors (ISVs) and independent hardware vendors (IHVs). It is managed by Windows Server 2008 and works with Windows Vista clients natively. Support for NAP in Windows XP clients is part of Service Pack 3 (SP3). Network access protection is designed to prevent computers that are lacking appropriate security measures including service updates and service packs as well as up-to-date antivirus definition files. NAP is discussed in detail in Chapter 10, but since we're looking at DHCP, we'll take a quick detour to understand how DHCP and NAP interact (see Exercise 8.3). Keep in mind that NAP can be enforced in different ways but that using DHCP is one of the weaker forms since users with administrator-level access can override certain settings with respect to DHCP and NAP enforcement. Network Access Protection in Windows Server 2008, Windows Vista, and Windows XP SP3 (with NAP Client for Windows XP)...
If the attacker is using Windows Server 2003 and his network card supports reconfiguring the MAC address, the network card's MAC address can be changed through the Network Properties window in the System Control Panel. Once the attacker is utilizing a valid MAC address, he is able to access any resource available from the wireless network. If WEP is enabled, the attacker must either identify the WEP secret key or capture the key through malware or by stealing the user's notebook.
Because typical remote access connections only validate the credentials of remote access users, a remote access client that connects to a private network can access network resources even if the configuration of the remote access client does not comply with corporate network policies. You can implement Network Access Quarantine Control to delay normal remote access to a private network until the configuration of the remote access client has been examined and validated by a client-side script. Network Access Quarantine Control provides protection when users in your organization accidentally reconfigure key settings and do not restore them before connecting to your network. For example, a user might disable antivirus software that is required while connected to your network or fail to implement a firewall.
In Chapter 1, Designing a Secure Network Framework, we discussed the threat posed to a modern network by malicious attackers using viruses,Trojans, and worms to affect the confidentiality, integrity, and availability of the data on a corporate network. It's not enough to provide virus protection at the server level each client on your network needs to have antivirus software installed and updated with the latest virus definitions in order to provide the best defense for your systems and data. Viruses can often enter a corporate network through a single end user either opening an infected e-mail attachment or browsing to a Web site that contains malicious code. Because of this, you need to design virus protection for all systems on your network that interact with the Internet and the rest of the world at large. Are you running an e-mail server Be sure that you are scanning incoming and outgoing e-mail messages for virus infections. Do your end users have Internet access from their...
Running Client Setup and using connectcomputer has an unfortunate side effect that you may not realize. Regardless of what level of domain user template you use, the users are placed in the Administrators local group on their computers. This makes it easy for them to install software (do you really want all your users being able to install any software they think they might want to use on their computer) and it makes it easy for them to get infected with whatever malware they happen to be careless about.
Two actions you can take on inbound SMTP mail are to run that mail through both a content scanner and an antivirus scanner. Doing both will protect your mail from viruses, unwanted attachments, and unwanted content. The URLScan and IIS Lockdown tools are suited for HTTP and port 80, not SMTP and port 25.
There is one change in the View options you should make for all users and all computers on your network. Deselect the option Hide extensions for known file types. This is a dangerous setting and I've never understood why Microsoft makes it the default setting. This setting probably launches more viruses than we'll ever know about. Even with diligent attention to keeping your antivirus software up to date, you can get a new virus before a detection method is available from your antivirus software vendor. When you receive an e-mail attachment named filename.txt, you know that it's highly improbable the file contains a virus. However, without the ability to see file extensions, you won't know that the real name is filename.txt.exe. The executable extension is at least a clue that the file could be dangerous. Make this change on your home computers, and advise your users to do the same on their own home systems.
Your antivirus strategy cannot be complete without support from Windows Server 2003 and Group Policy. WS03 includes a special set of GPO settings that identify the code that is allowed to run and operate within a network. These are the Software Restriction Policies (SRP).
Most companies grow their file server environment in an organic manner. This is to say that as different groups in the company come up with needs for data storage, additional file servers are brought up. This can be an expensive process in that each of these file servers requires not only hardware but also an operating system, antivirus software, management software, space in the data center, facilities like cooling and electricity, and
Distributed File System has come a long way with Windows Server 2003. The ability to pre-stage data, the ability to mirror the DFS root, and improvements in control of replication topologies have all helped companies to adopt and take advantage of Distributed File System. Although things have gotten better, many administrators still find that there are too many limitations to the functionality of File Replication Services. FRS can't deal properly with roaming profiles and it often replicates data unnecessarily. For example, most antivirus products flag files that they have recently scanned. FRS will misinterpret this as a modification to the file and will queue it up for replication to all of its partners.
The Internet Authentication Service (IAS) is the Microsoft Remote Authentication Dial-In User Service (RADIUS) server implementation, which can serve as both a RADIUS server and a RADIUS proxy. When configured as a RADIUS server, IAS can perform authentication (determining the identity of a user), authorization (determining what a user is allowed to access), and accounting (keeping track of a user's actions) for different types of network access. IAS can be used to configure and secure wireless local area networks (WLANs), as well as virtual private network (VPN) connections. In addition, you can use IAS to create a quarantine zone that will prevent remote clients from accessing your network until they have passed certain health checks, such as verifying patch levels and the status of antivirus software. You can also configure IAS to function as a RADIUS proxy, which means that IAS can forward authentication requests and accounting information to other RADIUS servers located elsewhere...
If you take a normal production Windows 2000 server with antivirus services and a few running applications on it, you'll find your memory is quickly used up. Always preplan what you'll be running on your server and get enough memory to support the services you plan to run. Although Microsoft says the minimum for Windows 2000 Advanced Server is 128MB of random access memory (RAM), you'll find 256MB is more efficient. Always remember, more memory can't hurt. Production systems today run anywhere from 512MB to 1GB of memory on Windows-based systems. Many system engineers don't take into consideration the fact that antivirus software is now a mandatory piece
Laura has previously contributed to the Syngress Publishing's Configuring Symantec Antivirus, Corporate Edition (ISBN 1-931836-81-7). She has also contributed to several other exam guides in the Syngress Windows Server 2003 MCSE MCSA DVD Guide and Training System series as a DVD presenter, contributing author, and technical reviewer.
Laura has previously contributed to the Syngress Publishing's Configuring Symantec Antivirus, Corporate Edition (ISBN 1-931836-81-7). She has also contributed to several other exam guides in the Syngress Windows Server 2003 MCSE MCSA DVD Guide & Training System series as a DVD presenter, contributing author, and technical reviewer.
By using software distribution, you can deploy software in your organization from a central location. By using data that is collected by hardware inventory, software inventory, or both, you can build lists of clients that need to receive specific software deployments. By using software distribution, you can then deploy software to those clients. For example, you can upgrade the client operating system or Office suite, deploy service packs, distribute new software, or distribute the latest antivirus signature file on a regular basis. Inventory data helps you build the lists of clients that require specific software. For example, using software inventory data, you can build a list of clients that do not have an antivirus program installed. By using hardware inventory data, you can build a list of clients with at least 500 MB of free disk space and then distribute software only to those clients.
Laura has previously contributed to Syngress Publishing's Configuring Symantec Antivirus, Corporate Edition (ISBN 1-931836-81-7). She has also contributed to several other exam guides in the Syngress Windows Server 2003 MCSE MCSA DVD Guide and Training System series as a DVD presenter, contributing author, and technical reviewer.
Just to be sure. you do have backup clients and antivirus engines running on your servers, don't you Thankfully, it's possible to install antivirus software like Microsoft's ForeFront and backup agents such as Symantec Backup Exec 12 on Windows 2008 Server Core. But how do you arrange this if you don't have Add Remove Programs or even a GUI Well, you still have msiexec.exe and the normal executable files. If you want to install an application with msiexec, just type msiexec i productname .msi . See Table 7.2 for some of the most oft-used command-line switches for msiexec. If you want to see the full list, use the link may get the feeling that without a GUI nothing can happen with your Server Core installation. With fewer DLLs, the attack surface may be reduced, but it's still advisable to install antivirus and backup agents on the machine. Maybe it's better to say that Server Core is shell-less and a little bit GUI-less. If you want, you can still install lots of software, as long as...
To include new features and more functionality in newer versions of an OS, programmers have to write more lines of code. More lines of code mean more room for security holes, which leads to more patch releases. Not only do you need antivirus software to protect your system against malicious programs, you also need to worry about security patches so that hackers don't take advantage of a security hole. This was the case with the Blaster worm, which recently exploited the RPC DCOM service and caused servers that didn't have the proper security patches to constantly reboot themselves, thus disrupting productivity by creating an unstable environment.
Laura has previously contributed to the Syngress Publishing's Configuring Symantec Antivirus, Corporate Edition (ISBN 1-931836-81-7). She has also contributed to several other exam guides in the Syngress Windows Server 2003 MCSE MCSA DVD Guide and Training System series as a DVD presenter, contributing author, and technical reviewer. Laura holds a bachelor's degree from the University of Pennsylvania and is a member of the Network of Women in Computer Technology, the Information Systems Security Association, and InfraGard, a cooperative undertaking between the U.S. Government other participants dedicated to increasing the security of United States critical infrastructures.
Enterprise virus protection is a must have in any computing environment. A single uncontrolled outbreak can cost tens of thousand of dollars in PC disinfection costs alone. Heavily infected networks must often be isolated from the Internet and taken out of service to allow IT staff to get ahead of rampant infections. Although most enterprise antivirus solutions offer similar capabilities, the solutions' effectiveness is determined more by implementation and maintenance ease than actual protection. The system must be universally Nstallel, employ a locked configuration to prevent software from beina disabled, and support centralized real-time reporting and alerting. In an SBC environment, the most common differentiator is the behavior of the scanner software in a multiuser environment. Initially, only Trend Micro's Server Protect product would consistently run correctly in a multiuser environment most products created a new instance of the scanner for every instance of a user...
You can also modify to whom, when, and how often the report is sent. To perform these tasks, open Server Management, click Monitoring and Reporting, and then click Change Server Status Report Settings. You can attach log files to the usage report, such as Windows Backup logs or antivirus logs. You can also modify to whom, when, and how often the report is sent. To perform these tasks, open Server Management, click Monitoring and Reporting, and then click Change Server Status Report Settings.
Active attacks are identical to the kinds of active attacks that are encountered on wired net-works.These include, but are not limited to, unauthorized access, spoofing, DoS, and flooding attacks, as well as the introduction of malware (malicious software) and device theft.
Antivirus Solutions Most administrators agree that antivirus solutions need to be deployed at several levels in the company. For example, antivirus applications should be installed on the following The hope is that if the firewall antivirus application fails, then the file server or the client computer antivirus software will catch any virus infections and cure or delete the infected files before they can infect the client computer or network services and resources. Antivirus software providers market themselves as the single-point solution for all of the company needs. If you buy their suite of products, you can install antivirus software at all points in the company and protect all the potential points of infiltration and infection. There is a failure in the logic of a single vendor solution. The problem is that if the vendor has not discovered the problem and written an update to protect against a new virus, then no matter in how many layers the software is implemented, it will not...
Virtual servers talk to each other in the same manner real servers do. This means that applications that traditionally couldn't run on the same server system can now share hardware but still perform in their original manner. Mail servers and antivirus gateways are a common example of applications that traditionally had to be run and maintained separately. Through Virtual Machine technology they can share the same physical hardware.