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Most test groups at Microsoft have large labs full of computers responsible for automated tests, stress tests, performance tests, and builds; these labs are prime candidates for consolidation Test labs rarely run anywhere near full capacity By using virtual machines, lab administrators can get the same work done on far fewer computers This saves valuable lab space as well as power costs Reducing server machine count also saves time for lab managers Every lab computer has a time cost that results from the work that must be done to install, rack, and configure it Management overhead is also associated with a server, including tasks such as upgrading and troubleshooting hardware Some overhead will always exist, but VM usage greatly reduces this overhead Virtualization reduces the number of physical computers that need this time commitment.

Because each listening service sends and receives data, attackers can intercept communications data to reveal unauthorized information. Many services (SNMP, Telnet, FTP, POP, and so on) use plaintext log-on names and passwords. Even other services that do not send plaintext data can be exploited. For instance, RDP was susceptible to man-in-the-middle (MitM) attacks for a while after its release. (This has been fixed.) Even though RDP used encryption, a new session could be intercepted and redirected through a remote attacker. Because RDP did not authenticate endpoint clients until version 6.0 and later, it was possible, although extremely difficult, for MitM attackers to inject themselves into the communication s stream and pull out encrypted log-on passwords one character at a time. Several hacking tools made implementing an RDP MitM attack as easy as clicking a few buttons, once the attacker got over the significant hurdle of inserting himself into the communication path. Eavesdropping can also be used to capture confidential and personal information beyond log-on credentials.

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Although many of these same tasks are still necessary on virtual machines, the work is easier because of the potential for automation It is impossible to automate some aspects of the physical setup of a computer, but scripting through the Windows Management Instrumentation (WMI) can perform the equivalent work for a virtual machine For example, virtual networks allow lab managers to dynamically modify the network topology.

Fully compromised systems can lead to additional network privilege escalation using passwords enumerated from service log-on accounts. If an attacker has privileged access (such as Administrator or Local System) to a system, he can use various methods and tools to recover custom service log-on account credentials in plaintext. If the recovered credentials are used on other computers or throughout the Windows domain, they can allow additional resources to be compromised. This is discussed in depth in 13, Securing the Network.

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A service may be well coded and not contain any known vulnerabilities and still be subject to malicious use. It is common for users and administrators to misconfigure services in a way that opens their computers to unauthorized access. For example, a user could install the IIS or FTP service, but use weak passwords. Or a user may install a peer-to-peer file-sharing program intending to share a smaller subset of folders, but instead share out her entire hard drive. This latter problem has led to many instances of confidential and top-secret documents being accidentally revealed on the Internet.

programmatically rather than by manually unplugging cables Because Hyper-V allows virtual machines of different types to run on the same physical computer, it is no longer necessary to have a wide variety of servers in a lab Of course, it is still valuable to have computers to represent esoteric hardware, and for this reason, we would never recommend that VM testing replace physical testing entirely But virtual machines can easily represent simple differences such as processor or core count, 32-versus 64-bit, and memory configurations Test Machine Configuration Savings Virtualization use is saving more than money, power, and space Development time is an enormously valuable resource, and virtualization can make developers and testers more efficient by reducing two major engineering time sinks: test machine setup time and test recovery time Testers and developers both spend a great deal of time setting up computers to test and validate their code.

Many services also advertise system information that can be used by malicious attackers. Sometimes the information is related to the service itself, and is crucial to the service s normal operations; at other times unexpected information is disclosed when malicious connection data is sent to it. For example, Microsoft security bulletin MS05-007 (http://www.microsoft.com/technet/security/Bulletin/MS05-007.mspx) discusses how the Computer Browser service and the Named Pipes feature can be used to enumerate logged-on user account names.

Figure 8-14 Starting a live note-taking session is as simple as clicking a button and sending an e-mail message.

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