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The main point of entry in most organizations is the internal corporate LAN A user who can connect to the corporate LAN is able to logically reach virtually every computing resource in the organization subject to the access controls associated with each resource This makes the notion of protecting corporate accesses by controlling access to the LAN an important topic The ease of connectivity to the corporate LAN highlights a number of important security issues Probably the biggest issue is the ability for non-organization-owned computers to connect to the network and access network-based resources By permitting non-organization-owned systems to connect to the network, the organization is essentially giving up control of the network By letting any computer or device connect to the network, this creates risks, including:
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Exposure to malware Any computer that is not actively managed by centralized antivirus software could be carrying malware that would attempt to propagate itself inside the corporate network Indeed, worms such as Nimda and Code Red were able to spread in just this way Laptops that were the personal property of employees would become infected on home networks and then spread the infection inside the corporate LAN in typhoid Mary style Many instances of malware being imported on vendor-owned computers (for demo purposes) are also known Eavesdropping While the IT department can exert some level of control over desktop and server computing by prohibiting (and even preventing) the installation of network sniffing programs, IT cannot easily control whether non-organization-owned computers have network sniffing programs (or malware that does the same thing!) Open access A corporate LAN that permits any device to connect will permit a wireless access point to connect to the network This, in turn, may permit anyone with a Wi-Fi client to connect to the network Permitting any type of device to connect could also permit the use of dial-in modems (although these would be a bit more difficult to set up, since analog phone lines would also be needed) Technologies are now available that are used to control the systems that are permitted to connect to the corporate LAN The 8021X network access control protocol is used to control whether a system is permitted to connect to corporate network resources 8021X uses an authentication mechanism to determine if each new device is permitted to connect If the device lacks the necessary credentials, it cannot connect This is not the same as whether the device is able to physically connect Rather, network switches play a role in 8021X; if a device is not permitted onto the network, the workgroup switch will not route any packets from the denied workstation into the LAN The workstation remains logically disconnected
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Remote access is defined as the means of providing remote connectivity to a corporate LAN through a data link Remote access is provided by most organizations so that employees who are temporarily or permanently off-site can access LAN-based resources from their remote location Remote access was initially provided using dial-up modems that included authentication While remote dial-up is still provided in some instances, most remote access is provided over the Internet itself, and typically uses an encrypted tunnel known as a virtual private network (VPN) to protect transmissions from any eavesdroppers VPNs are so prevalent in remote access technology that the terms VPN and remote access have become synonymous Remote access architectures are depicted in Figure 6-1
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Figure 6-1 Remote access architectures
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The two security controls that are essential for remote access are: Authentication It is necessary to know who is requesting access to the corporate LAN Authentication may consist of the same user ID and password that personnel use when on-site, or they may be required to provide additional credentials, such as a group or site password, token, or biometric Encryption Many on-site network applications do not encrypt sensitive traffic because it is all contained within the physically and logically protected corporate LAN However, since remote access gives the same function as being on the corporate LAN, and because the applications themselves usually do not provide encryption, the remote access service itself usually provides encryption Encryption may use SSL, IPsec, L2TP, or PPTP These controls are needed because they are a substitute (or compensating control) for the physical access controls that are usually present that control which personnel may enter the building to use the on-site corporate LAN When personnel are on-site, their identity is confirmed through keycard or other physical access controls When personnel are off-site using remote access, since the organization cannot see the person on the far end of the remote access connection, the authentication that is used is the next best thing
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