c# wpf qr code generator Designing a Security Update Infrastructure in C#.NET

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Designing a Security Update Infrastructure
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Why Security Patches Should Be Tested
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Security patches are tested by Microsoft before they are released. However, this does not mean that a security patch will not cause problems when installed on a production sys tem. There are many variables that make a security patch cause problems, including:
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A computer has an installed device that is incompatible
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A computer is using some combination of products that causes a problem
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In addition, there could be a flaw in the security patch itself. To reduce the chance that a security patch will cause a problem for production systems, all security patches should be tested before they are used to update the computers on your network.
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Testing Guidelines
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Testing security patches is much like many other testing processes. Follow these guidelines to test security patches.
Test security patches on test computers and not on production computers. Test security patches on computers that are installed on test networks. Test security patches on representative computer systems. Representative com puter systems are computers that are running the same software and configured the same way that production systems are. Subscribe to lists and visit newsgroups frequented by your peers. These lists and newsgroups are the places that others report their security patch problems. Report security patch problems to Microsoft. Microsoft has and will fix and rerelease security patches and/or help organizations to determine the cause of the patching problem.
Guidelines for Monitoring and Improving the Patch Management Process
When a patch management process does not exist or is poorly executed, every security bulletin can trigger anxiety, panic, and possibly even paralysis. Because of lack of proper management, more time is needed to respond and an attack is more likely to succeed. This reduces the amount of time that is available to respond. When patch management is under control, each new security bulletin can be calmly considered according to the normal security update process. The patch is more likely to be fully distributed before an attack occurs. However, even sound patch management pro cesses do not always allow enough time to respond to a new threat. Is there a way to increase the speed or efficiency of responses to security bulletins
Lesson 3
Monitoring and Improving the Security Patch Update Process
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Note A regular process of security updating will ensure that systems are configured to meet threats that take advantage of system vulnerabilities. Often, by attending to sound security practices, you can even have proper mitigation in place and will either be unaffected by an attack based on the vulnerability or less affected than organizations that do not follow these practices. This does not mean that patching is not necessary, just that both efforts patching and security practices complement each other.
Real World Blaster Worm and Change Management
In July 2003, a vulnerability was discovered with the Windows remote procedure call (RPC) service. The vulnerability was considered so severe that extraordinary measures were taken to notify Windows users. In addition to sending security bulletins to security bulletin subscribers, Microsoft took the unusual step of send ing announcements and warnings to customers. Many security organizations, pub lications, and the mainstream press provided information and repeated the warnings. Patch while there s time, everyone said. However, when a worm that exploited the vulnerability surfaced (the so-called Blaster, or LoveSan, worm), a large number of computers were infected nonetheless. Microsoft Certified Professional Magazine did a quick survey in which they asked network administrators whether they were affected by the worm. More than 40 percent indicated they knew about the worm but were still affected. They just did not have the time necessary to patch all systems. (The patch was available three weeks before the worm was released.) A small percentage indicated they had not heard about the worm. An independent survey at www.howstuffworks.com indicated that 27 percent of respondents had problems with the Blaster worm. Symantec indicated that more than 330,000 computers were infected. To make any operation more efficient, determine the steps in the process and then determine those you can change and ignore those you cannot. You cannot, for exam ple, affect the time it takes to produce and make available a patch, and you cannot affect the time at which an attack based on the vulnerability becomes available. You can, however, influence the time it takes to approve a patch for distribution on your network (approval time), and you can influence the time it takes to distribute and apply the patch (patch time). Follow these guidelines to improve the efficiency com ponent of your security update design:
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