When the word ‘Nessus’ is brought into any conversation, almost no one thinks about a computer program, let alone a specific application software that audits networks in order to provide vulnerability reports.
As Nessus is the name of the centaur that tricked Heracles’ wife into killing him in the Greek mythology, you can sense a similarity between the mythic creature and the software.
Nessus, the centaur, searched for a vulnerability in Deianeira and exploited it to serve his goal, while Nessus, the program, does the same thing for computer networks, leaving aside the exploiting part of the legend.
On the contrary, Nessus does what it takes to keep exploiters at bay by patching the vulnerabilities found in the system. Its plugin library holds tens of thousands of items for you to add the the core application in order to make it your way, to match your expectations and preferences in the most simple, elegant, possible and, why not, plausible way.
Nessus can be used in small companies as well as in larger ones as its scalability is not limited to a specific number of networks, servers and workstations. Its integrated technologies help you perform physical as well as virtual device discoveries alongside software auditing.
Furthermore, Nessus also audits mobile devices in order to provide a broad asset coverage and profiling of the entire organization environment, both cable-depending and wireless-enabled hardware. You can now rest assured that you have an application to detect suspicious behavior or known malware such as botnets.
All in all, Nessus adds a few layers of protection to your network by providing solutions to potential vulnerabilities, categorizes them, prioritizes them while also performing non-intrusive sensitive content auditing for better management and faster patching of the most important problems.
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Nessus is an open source vulnerability scanner. It allows network administrators to rapidly test their network’s security, in order to identify vulnerabilities and patch them before they are exploited. Nessus performs scanning over the entire network, supporting any type of device, as well as on mobile devices and virtualized servers.
The Nessus scan engine is written in C and is actively developed. The scanning engine runs continuously on the target machine, performing a passive scan of the network. The scan engine’s results are saved in a database and can be exported as CSV, XML, HTML, or even a custom format.
Features:
Passive: Nessus will try to detect, on the target computer, any system running Nessus.
Scans All Hosts Within The Subnet:
Nessus will scan each host on the subnet and submit all detected vulnerabilities to the Nessus database.
Send Results Of Scan To Nessus Database:
Nessus scans each host and checks if each one has vulnerabilities or not. Nessus will then send the results of the scan to the Nessus server, to the Nessus database. The Nessus database will have a centralized database of all the active Nessus scan results. Nessus will automatically learn the top vulnerabilities from your current scan history, and present an accurate vulnerability report for your entire network.
Displays Report To Console:
Nessus will display the entire report to your console (Operating System dependent)
Scan Multiple Servers
Nessus supports scanning multiple servers at once. If this feature is turned on, then once a machine is scanned, the plugins for that machine will be automatically configured to create their appropriate files for scanning the next machines. This feature is useful if you have a large number of servers that you need to scan at once.
Search For Specific Protocols
Nessus will search your network for the following protocols: SSH, NFS, HTTP, FTP, SMTP and Mail.
Easy Plugin Management With Plugin Manager
Add the plugins, modify the settings, and auto-update them. After a Nessus scan, the Nessus Server can automatically download the plugins that have been found and verified as vulnerable. This makes managing Nessus plugins and updates a breeze.
Scan Networks With Pre-Configured Nessus Server
Use the pre-configured Nessus Server plugin, and create a configuration in only a few minutes.
Remote Scanning
Scan any device on a network, including mobile phones and PDAs.
Customizable
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Key features:
Vulnerability Scan – Verify your systems for known vulnerabilities and patch your systems.
Vulnerability Assessment – Find and fix issues on your network.
Network Protocol Analyzer – Preview and analyze network traffic to detect network problems and malware.
SSL/TLS Analyzer – Check if your web and e-mail servers are configured correctly.
Intrusion Detection – Monitor your networks for known intrusions or identify unknown intrusions.
Penetration Testing – Run advanced attacks to test your network security.
Scan Scheduling – Plan your scans and run them on-demand.
Vulnerability Assessment
Nessus scans your entire network for known vulnerabilities and patch your systems with the most up-to-date patch level. You can either define vulnerabilities with limited information about each vulnerability (such as a directory or file name) or with full details about each vulnerability and their potential impact on the system.
Nessus has the flexibility to search for several types of vulnerability including those associated with known exploits and those that would be exploited by software like recent zero-day exploits. You can also define your own types of vulnerability (or vulnerabilities) to search for in Nessus.
Vulnerability Assessment
Nessus scans your entire network for known vulnerabilities and patch your systems with the most up-to-date patch level. You can either define vulnerabilities with limited information about each vulnerability (such as a directory or file name) or with full details about each vulnerability and their potential impact on the system.
Nessus has the flexibility to search for several types of vulnerability including those associated with known exploits and those that would be exploited by software like recent zero-day exploits. You can also define your own types of vulnerability (or vulnerabilities) to search for in Nessus.
Intrusion Detection
Nessus monitors your network in real-time to detect malicious activities or suspicious behavior. Nessus can detect the following activities or suspicious behavior:
Data Exfiltration – Send large amounts of information off your network to an unauthorized location.
IP Spoofing – Masquerade your computer’s IP address to masquerade as another computer.
Mirror server – Send data to an unauthorized location over the Internet.
Reverse Internet Connection – Expose the private network connection of another computer or network.
Remote Access – Access another computer or network from a remote location.
Denial of Service (DoS) – Interrupt or hinder
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Nessus is a free, open source penetration testing and vulnerability assessment tool for LANs (IPv4 and IPv6),
and WANs (IPv4 and IPv6), as well as for virtual and physical environments.
It is written and maintained by Tenable Network Security as a free product to support the network security practitioner and to advance security testing capabilities.
Nessus is the security tool used by the red team community.
Nessus is known for its high accuracy, wide coverage and its ease of use. It is known for being scalable, pluggable, extensible and for being available on many operating systems.
Nessus is commercially available as a SaaS offering, which provides a web interface to Nessus database, as well as a Enterprise edition. It can also be used by organizations to perform red team exercises.
Nessus is considered to be an advanced open source vulnerability scanner with a reputation and a history for accuracy in vulnerability detection, generated by the tool’s massive userbase, who use it for penetration testing or risk assessment.
Nessus was named after the centaur Nessus, the best friend of the Greek hero Heracles. It was originally written by Kevin D. Bocek at McMaster University in Canada.
Nessus is a fileless binary application and there is no need to run it in a console. It checks a server against its rulebase and registers any vulnerabilities it discovers. Nessus includes a database of known vulnerabilities, which can be used by the user to perform a “zero day” check on all the devices on a network. Nessus can also be used to perform “operational checks” which involve checking networked devices for known vulnerabilities and known malware. Nessus is not intended for use in a production network, because it is free and open-source software. Nessus provides a cost-effective alternative to proprietary vulnerability scanners, which are often prohibitively expensive, out of the reach of some organizations and users. It does not require an extensive database of vulnerabilities to perform this task; it can be trained on most common vulnerabilities and can be run quickly. It is easy to use, running on most operating systems, and can be made highly customizable. Nessus saves time by not having to depend on any particular scanning library, and provides a user-friendly, high-speed interface.
Nessus is designed to be a low-cost, high-speed alternative to traditional vulnerability scanners that can
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Nessus is a network security management system that relies on a multi-auditing methodology. From the point of view of the technology, Nessus looks at individual packets coming into or out of the network to detect system vulnerabilities.
This multi-auditing methodology is designed to reveal problems like accidental scans, evasion attempts, and data manipulations. Furthermore, Nessus discovers and patches code within the organization’s systems to protect against zero-day vulnerabilities.
You can use Nessus to use Nessus use to scan corporate networks to discover any unpatched vulnerabilities. If Nessus finds an unpatched vulnerability, it will attempt to patch it.
Nessus can alert users of any unpatched system vulnerabilities. It can also install security patches.
Nessus is actively maintained and updated with a new release approximately every six months.
Nessus software is an enterprise-grade tool designed for network administrators.
Using Nessus as a Network Security Management solution, the Nessus toolkit includes five products:
Nessus® Audit Engine Nessus™ Scanner Nessus Team™ Nessus Vulnerability Manager Nessus Administrator®
Nessus Audit Engine is a free program that can be used to perform complete vulnerability scans of network devices.
Nessus software discovers and patches network security vulnerabilities before they are exploited. In addition to this, it also performs detailed and meaningful vulnerability reports.
Nessus Scanner is a free scanning program that can scan any type of network. It has built-in plugins for well-known operating systems like Unix/Linux, Microsoft Windows, Android, and Apple iOS.
Nessus vulnerability manager software is used for managing vulnerabilities and for carrying out campaigns to address and remediate vulnerabilities.
Nessus Vulnerability Manager software allows administrators to analyze newly detected vulnerabilities. In addition, you can also search for known vulnerabilities to compare with your security policies.
Nessus Administrator software allows network administrators to manage Nessus security policies. It provides full control over the Nessus platform and the Nessus site. Nessus Site allows your organization to share information about security vulnerabilities and Nessus policy changes with customers and partners.
NessusScanner supports scanning several network devices on a single host. NessusScanner also supports scanning over VPN tunnel.
This free application uses up to 64 MB of RAM on Microsoft Windows, with 32 MB being the preferred setting, and requires a bandwidth of 512 KB/sec. Operating system-dependent memory utilization is about 20 MB
System Requirements For Nessus:
OS: Windows 7, 8, 8.1 (64-bit OS), 10 (64-bit OS), Server 2008 R2 (64-bit OS), Server 2012 (64-bit OS), Windows Server 2012 R2 (64-bit OS), Windows Server 2016 (64-bit OS), Windows Server 2019 (64-bit OS)
CPU: 2.0 GHz Processor
Memory: 2 GB RAM
DirectX: Version 9.0c
Hard Disk Space: 15 GB available space
Language: English
How To Install