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Practical Network Scanning

You're reading from   Practical Network Scanning Capture network vulnerabilities using standard tools such as Nmap and Nessus

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Product type Paperback
Published in May 2018
Publisher
ISBN-13 9781788839235
Length 326 pages
Edition 1st Edition
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Author (1):
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Ajay Singh Chauhan Ajay Singh Chauhan
Author Profile Icon Ajay Singh Chauhan
Ajay Singh Chauhan
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Table of Contents (15) Chapters Close

Preface 1. Fundamental Security Concepts 2. Secure Network Design FREE CHAPTER 3. Server-Level Security 4. Cloud Security Design 5. Application Security Design 6. Threat Detection and Response 7. Vulnerability Assessment 8. Remote OS Detection 9. Public Key Infrastructure-SSL 10. Firewall Placement and Detection Techniques 11. VPN and WAN Encryption 12. Summary and Scope of Security Technologies 13. Assessment 14. Other Books you may enjoy

OS matching algorithms


Nmap's algorithm for detecting matches is a simple process which collects target fingerprints and tests it against every single reference fingerprint in nmap-os-db. After testing all the probes against a fingerprint, Nmap divides NumMatchPoints by possible points. The result of this is a confidence factor describing the probability that the subject fingerprint matches that particular reference fingerprint.

Defense against port scans

So far, we have learned how to use port scanning techniques to discover and detect information about remote hosts. Let's try to understand that any services/hosts will be vulnerable to port scans, which are exposed to users through some sort of connectivity. This might include an enterprise WAN or the internet. Port scanning is also not classed as illegal activity unless information is used to exploit systems.

The amount of information that should be exposed to the outside world is down to the system administrator. Any IP scanning starts with...

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