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Six free network vulnerability scanners

You may not need to pay for expensive tools

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Vulnerability scanners can help you automate security auditing and can play a crucial part in your IT security. They can scan your network and websites for up to thousands of different security risks, producing a prioritised list of those you should patch, describe the vulnerabilities, and give steps on how to remediate them. Some can even automate the patching process.

Though vulnerability scanners and security auditing tools can cost a fortune, there are free options as well. Some only look at specific vulnerabilities, but there are also those that offer broad IT security scanning.

1. OpenVAS

The Open Vulnerability Assessment System (OpenVAS) is a free network security scanner platform, with most components licensed under the GNU General Public License (GNU GPL). The main component is available via several Linux packages or as a downloadable Virtual Appliance for testing/evaluation purposes. Though the scanner itself doesn't work on Windows machines, they offer clients for Windows.

The main component of the OpenVAS is the security scanner, which only can run in Linux. It does the actual work of scanning and receives a feed updated daily of Network Vulnerability Tests (NVT), more than 33,000 in total.The OpenVAS Manager controls the scanner and provides the intelligence. The OpenVAS Administrator provides a command-line interface and can act as full service daemon, providing user management and feed management.

There are a couple clients to serve as the GUI or CLI. The Greenbone Security Assistant (GSA) offers a web-based GUI. The Greenbone Security Desktop (GSD) is a Qt-based desktop client that runs on various OSs, including Linux and Windows. And the OpenVAS CLI offers a command-line interface.

OpenVAS isn't the easiest and quickest scanner to install and use, but it's one of the most feature-rich, broad IT security scanners that you can find for free. It scans for thousands of vulnerabilities, supports concurrent scan tasks, and scheduled scans. It also offers note and false positive management of the scan results. However, it does require Linux at least for the main component.

2. Retina CS Community

Retina CS Community provides vulnerability scanning and patching for Microsoft and common third-party applications, such as Adobe and Firefox, for up to 256 IPs free. Plus it supports vulnerabilities within mobile devices, web applications, virtualised applications, servers, and private clouds. It looks for network vulnerabilities, configuration issues, and missing patches.

The Retina CS Community software essentially provides just the patching functionality. Retina Network Community is the software that provides the vulnerability scanning, which must be separately installed before the Retina CS Community software.

Retina CS Community installs on Windows Server 2008 or later, requires the .Net Framework 3.5 to be installed, IIS server enabled, and Microsoft SQL 2008 or later to be installed. Keep in mind, installation on Domain Controllers or Small Business Servers is not supported.

Once the software is installed you're provided with a GUI program for Retina Network Community component and a web-based GUI for the Retina CS Community component. It supports different user profiles so you can align the assessment to your job function.

To scan you can choose from a variety of scan and report templates and specify IP range to scan or use the smart selection function. You can provide any necessary credentials for scanned assets that require them and choose how you want the report delivered, including email delivery or alerts.

Retina CS Community is a great free offering by a commercial vendor, providing scanning and patching for up to 256 IPs free and supporting a variety of assets. However, some small businesses may find the system requirements too stringent, as it requires a Windows Server.

3. Microsoft Baseline Security Analyser (MBSA)

Microsoft Baseline Security Analyser (MBSA) can perform local or remote scans on Windows desktops and servers, identifying any missing service packs, security patches, and common security misconfigurations. The 2.3 release adds support for Windows 8.1, Windows 8, Windows Server 2012 R2, and Windows Server 2012, while also supporting previous versions down to Windows XP.

MBSA is relatively straightforward to understand and use. When you open it you can select a single Windows machine to scan by choosing a computer name from the list or specifying an IP address or when scanning multiple machines you can choose an entire domain or specify an IP address range. You can then choose what you want to scan for, including Windows, IIS and SQL administrative vulnerabilities, weak passwords, and Windows updates.

Once the scan is complete you'll find a separate report for each Windows machine scanned with an overall security classification and categorised details of the results. For each item you can click a link to read details on what was scanned and how to correct it, if a vulnerability were found, and for some you can click to see more result details. The reports are automatically saved for future reference, but you can also print and/or copy the report to the clipboard.

Although free and user-friendly, keep in mind that MBSA lacks scanning of advanced Windows settings, drivers, non-Microsoft software, and network-specific vulnerabilities. Nevertheless, it's a great tool to help you find and minimise general security risks.


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