generate qr code from excel list Figure 12-13 Registering a system with the Red Hat Update Agent in Software

Print QR-Code in Software Figure 12-13 Registering a system with the Red Hat Update Agent

Figure 12-13 Registering a system with the Red Hat Update Agent
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12: Security Baselines
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Once the profile has been built, the Update Agent contacts the Red Hat update server to obtain information on available updates for the packages selected in the profile Once a list of updates is obtained, the Update Agent allows the user to select which updates to download and install, as shown in Figure 12-14 This lets users selectively download and install updates at their convenience An active Internet connection is required to use the Red Hat Update Agent Regardless of the method used to update the OS, it is critically important that you keep systems up to date New security advisories are issued every day, and while a buffer overflow may be a potential problem today, it will almost certainly become a definite problem in the near future Much like the steps taken to baseline and initially secure an OS, keeping every system patched and up to date is critical to protecting the system and the information it contains
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While considering the baseline security of systems, you must consider the role the network connection plays in the overall security profile The tremendous growth of the Internet and the affordability of multiple PCs and Ethernet networking have resulted in almost every computer to be attached to some kind of network, and once computers are attached to a network, they are open to access from any other user on that network Proper controls over network access must be established on computers by controlling the services that are running and the ports that are opened for network access In addition to servers and workstations, however, network devices must also be examined: routers, switches, and modems, as well as other various components Today s network infrastructure components are similar to other computing devices on the network they have dedicated hardware that runs an OS, typically with one or
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Figure 12-14 Selecting from available updates in the Red Hat Update Agent
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PART IV
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more open ports for direct connection to the OS, as well as ports supporting various network services Any flaws in the coding of the OS can be exploited to gain access as with any regular computer These network devices should be configured with very strict parameters to maintain network security Like normal computer OSs that need to be patched and updated, the software that runs network infrastructure components needs to be updated regularly Finally, an outer layer of security should be added by implementing appropriate firewall rules and router ACLs
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Maintaining current vendor patch levels for your software is one of the most important things you can do to maintain security This is also true for the infrastructure that runs the network While some equipment is unmanaged and typically has no network presence and few security risks, any managed equipment that is responding on network ports will have some software or firmware controlling it This software or firmware needs to be updated on a regular basis The most common device that connects people to the Internet is the network router Dozens of brands of routers are available on the market, but Cisco Systems products dominate The popular Internetwork Operating System (IOS) runs on more than 70 of Cisco s devices and is installed countless times at countless locations Its popularity has fueled research into vulnerabilities in the code, and over the past few years quite a few vulnerabilities have been reported These vulnerabilities can take many forms as routers send and receive several different kinds of traffic, from the standard Telnet remote terminal, to routing information in the form of Routing Information Protocol (RIP) or Open Shortest Path First (OSPF) packets, to Simple Network Management Protocol (SNMP) packets This highlights the need to update the IOS software on a regular basis Cisco s IOS also runs on many of its Ethernet switching products Like routers, these have capabilities for receiving and processing protocols such as Telnet and SNMP Smaller network components do not usually run large software suites and typically have smaller software loaded on internal Nonvolatile RAM (NVRAM) While the update process for this kind of software is typically called a firmware update, this does not change the security implications of keeping it up to date In the case of a corporate network with several devices, someone must take ownership of updating the devices, and updates must be performed regularly according to security and administration policies
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