What is Nessus? Nessus is one of the most popular vulnerability scanners. It was initially free and open source, but they closed the source code in 2005 and removed the free 'Registered Feed' version in 2008. It now costs $2,190 per year, which still beats many of its competitors.
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A free “Nessus Home” version is also available, though it is limited and only licensed for home network use. Nessus is constantly updated, with more than 70,000 plugins. Key features include remote and local (authenticated) security checks, a client/server architecture with a web-based interface, and an embedded scripting language for writing your own plugins or understanding the existing ones. For downloads and more information, visit the. Key Features.
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Identifies vulnerabilities that allow a remote attacker to access sensitive information. Checks whether the systems in the network have the latest software patches. Tries with default passwords, common passwords, on systems account. Configuration audits. Vulnerability analysis. Customized reporting. Nessus gives you lots of choices when it comes to running the actual vulnerability scan.
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You’ll be able to scan individual computers, ranges of IP addresses, or complete subnets. There are over 107130 vulnerability plug-ins with Nessus, which allow you to specify an individual vulnerability or a set of vulnerabilities to test for. In contrast to other tools, Nessus won’t assume that explicit services run on common ports; instead, it will try to exploit the vulnerabilities. Among the foundations for discovering the vulnerabilities in the network are:. Determining which operating system is running in the remote machine. Knowing which systems exist. Knowing which ports are open and which listening services are available on those ports.
The basic workflow of Nessus tool is to Login, Create or Configure the Policy, Run the Scan, and Analyze the Results. Configuring the Policy Policies are the vulnerability tests that you can perform on the target machine. Click on the Policies tab on the left of the screen under Resources Click on the New Policy button to create a new policy Under the Scanner tab select the Policy Template based on the scan requirement, such as Basic Scan, Host Discovery, Web Application Tests etc. Based on this type, Nessus prompts you for different options to be selected. For example, Advanced Scan has the following options.