Nessus is a complete and very useful network vulnerability scanner which includes high-speed checks for thousands of the most commonly updated vulnerabilities, a wide variety of scanning options, an easy-to-use interface, and effective reporting.

Nessus is a complete and very useful network vulnerability scanner which includes high-speed checks for thousands of the most commonly updated vulnerabilities, a wide variety of scanning options, an easy-to-use interface, and effective reporting.

The Nessus vulnerability scanner, is the world-leader in active scanners, featuring high speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture. Nessus scanners can be distributed throughout an entire enterprise, inside DMZs, and across physically separate networks.

Features:

· A complete analysis of your security level
· Up-to-date security vulnerability database.
We mostly focus on the developement of security checks for recent security holes. Our security checks database is updated on a daily basis, and all the newest security checks are available here and can be retrieved with the command nessus-update-plugins. An RSS feed of all the newest security checks allows you to monitor which plugins are added and when.
· Remote and local security.
Traditional network security scanners tend to focus on the services listening on the network - and only on these. Now that viruses and worms are propagating thanks to flaws in mail clients or web browsers, this conception of security is getting outdated.
· Elegant architecture
· Extremely scalable
Nessus has been built so that it can easily scale down to a single CPU computer with low memory to a quad-CPUs monster with gigabytes of RAM. The more power you give to Nessus, the quicker it will scan your network.
· Plug-ins
Each security test is written as an external plugin, written in NASL. This means that updating Nessus does not involve downloading untrusted binaries from the internet. Each NASL plugin can be read and modified, to better understand the results of a Nessus report.
· NASL
The Nessus Security Scanner includes NASL, (Nessus Attack Scripting Language) a language designed to write security test easily and quickly. NASL plugins run in a contained environment on top of a virtual machine, thus making Nessus an extremely secure scanner.
· Others
· Smart service recognition
Nessus does not believe that the target hosts will respect the IANA assigned port numbers. This means that it will recognize a FTP server running on a non-standard port (ie: 31337), or a web server running on port 8080. Nessus is the first scanner on the market to have implemented this feature for all the security checks (and has been copied by many since then).
· Multiples services
If a host runs the same service twice or more, Nessus will test all of them. Believe it or not, several scanners on the market still consider that a host can only run one server type at once.
· Full SSL support
Nessus has the ability to test SSLized services such as homepage smtps, imaps, and more. You can even supply Nessus with a certificate so that it can integrates into a PKI-fied environement. Once again, Nessus was one of the first security scanner on the market to provide this feature.
· Non-destructive or thorough
Nessus gives you the choice between performing a regular non-destructive security audit on a routinely basis, or to throw everything you can at a remote host to see how will it withstands attacks from intruders. Many scanners consider their users to be too inexperienced to make that kind of choice, and only offer them to perform "safe" checks.
· The biggest user base
The most pessimistic computations, based on the number of downloads every day, give Nessus at least 50,000 users worldwide, but there might be even more - after all, Nessus is downloaded over 2,000 times every day !
Our huge user base allows us to get the best feedback regarding security checks - and therefore to offer security checks which are reliable, non destructive and not prone to false positives.

New Release
Tenable is pleased to announce the release of Nessus 4.4.1.
This new release contains the following improvements and fixes:
- It is now possible to define a global maximum number of packets per second sent by the SYN scanner, no matter how many scans are running, by setting the option nessus_syn_scanner.global_throughput.max in nessusd.conf (for instance, setting nessus_syn_scanner.global_throughput.max = 10000 guarantees that nessusd will not send more than 10,000 packets per second during the port scan phase). Use this feature if you're scanning through fragile firewalls or if you want to reduce the impact of the port scan on the network ;
- We've modified the backend database to automatically switch from the quot;highquot; memory usage (which uses more memory but is faster during the scan) to quot;lowquot; (which uses less memory but slows scans down a little) when nessusd can't allocate enough memory. In 4.4.0, Nessus would abort if it could not load the database in memory ;
[ Nessus release history ]

Mac OS X 10.4 and 10.5

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