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While no longer the platform of choice for most new applications, many client-server applications are still in use and require continued, and even improved, protection from threats Client-server environments are subject to the same threats and have most or all of the same vulnerabilities as ordinary servers and workstations Those threats, vulnerabilities, and countermeasures are discussed elsewhere in this chapter
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The threats and countermeasures that are specific to client-server environments include the following: Access controls Most client-server applications were developed in an era when the prospect of impersonated client systems seemed remote However, client-server applications that are designed today would certainly include strong authentication between client software and server software (in addition to workstation authentication using 8021X and end-user authentication to the network) Older client-server environments may lack one or more of these authentication components While altering the existing client-server components themselves may be infeasible, other compensating controls may be viable, including workstation-based integrity management software, antimalware, and workstation hardening Interception of client-server communications Eavesdropping and interception of client-server communications can result in a compromise of sensitive or valuable information Furthermore, an MITM attack can result in intercepted and altered communications, with consequences including compromise of sensitive information and fraud The most effective countermeasure for traffic interception is network encryption between servers and client workstations Network failure See the earlier section on network security for details Change management When application code changes are considered, the project team making the changes needs to establish comprehensive test and implementation plans to ensure that the change will result in the correct functional changes in the environment This is further complicated by the fact that code changes may also require distribution of the code change to all of the client workstations in the organization If some of those workstations are laptop computers, installation of client software updates will be logistically challenging since not all laptops will be available when the IT department intends to update them Disruption of client software updates If clients are unable to receive and install software updates, they may fail to operate properly In client-server architecture, client software must be in close synchronization with server software, since part of the application s business logic is server-based and part is client-based An update to the application that requires changes to both the server as well as all clients may fail for any workstations that cannot install the new updates The purpose of attacks on the client software distribution mechanism or on client workstations themselves may be the disruption of the entire application in an organization In addition to system hardening, countermeasures include encryption, reports indicating the success rate of client updates, and tools to troubleshoot client update problems
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6: Information Asset Protection
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Stealing data Users of client-server applications will be able to steal information if their client workstations include a full operating system and access to external storage devices (this is also a viable threat to web-based applications) In environments where the information being viewed and managed is highly sensitive or valuable, additional countermeasures, such as blocking the use of external storage devices (floppy drives, CD/DVD-ROM, and USB-based storage), may be warranted
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Innovations in wireless communications have produced a productivity breakthrough for many workers who no longer have to be constrained to working at their desks Wireless network technologies have enabled workers to connect to enterprise networks, regardless of their location However, some wireless communications technologies have significant vulnerabilities, and most are subject to serious threats Early wireless LAN (WLAN, or Wi-Fi) technologies did not encrypt traffic at all This permitted other users (and outsiders anyone within range of a wireless LAN) to use relatively simple tools to intercept and record wireless network transmissions At that time, since many internal communications, including logon sessions, were not encrypted, sniffing a wireless network from a safe location could yield as much rich information as a sniffer connected directly to the network minus the risks related to getting a sniffer inside an office building Wireless networks are attractive to intruders because they provide an opportunity to easily penetrate a network without the risks associated with breaking into a physical building
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