Network Scanning Cookbook

By : Jetty

Buy this Book

Network Scanning Cookbook

By: Jetty

Buy this Book

Overview of this book

Network scanning is a discipline of network security that identifies active hosts on networks and determining whether there are any vulnerabilities that could be exploited. Nessus and Nmap are among the top tools that enable you to scan your network for vulnerabilities and open ports, which can be used as back doors into a network. Network Scanning Cookbook contains recipes for configuring these tools in your infrastructure that get you started with scanning ports, services, and devices in your network. As you progress through the chapters, you will learn how to carry out various key scanning tasks, such as firewall detection, OS detection, and access management, and will look at problems related to vulnerability scanning and exploitation in the network. The book also contains recipes for assessing remote services and the security risks that they bring to a network infrastructure. By the end of the book, you will be familiar with industry-grade tools for network scanning, and techniques for vulnerability scanning and network protection.

Preface

Who this book is for

What this book covers

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Sections

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Free Chapter

Introduction to Network Vulnerability Scanning

Basic networks and their components

Network Vulnerability Scanning

Uses

Complexity

Response

Summary

Understanding Network Scanning Tools

Introducing Nessus and Nmap

Installing and activating Nessus

Downloading and installing Nmap

Updating Nessus

Updating Nmap

Removing Nessus

Removing Nmap

Port Scanning

Introduction

How to specify a target

How to perform host discovery

How to identify open ports

How to manage specification and scan order

How to perform a script and version scan

How to detect operating system

How to detect and bypass network protection systems

How to use Zenmap

Vulnerability Scanning

Introduction

How to manage Nessus policies

How to manage Nessus settings

How to manage Nessus user accounts

How to choose a Nessus scan template and policy

How to perform a vulnerability scan using Nessus

How to manage Nessus scans

Configuration Audits

Introducing compliance scans

Selecting a compliance scan policy

Introducing configuration audits

Performing an operating system audit

Performing a database audit

Performing a web application scan

Report Analysis and Confirmation

Introduction

Understanding Nmap outputs

Understanding Nessus outputs

How to confirm Nessus vulnerabilities using Nmap and other tools

Understanding the Customization and Optimization of Nessus and Nmap

Introduction

Understanding Nmap Script Engine and its customization

Understanding the Nessus Audit policy and its customization

Network Scanning for IoT, SCADA/ICS

Introduction to SCADA/ICS

Using Nmap to scan SCADA/ICS

Using Nessus to scan SCADA/ICS systems

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How to detect operating system

Nmap uses TCP/IP stack fingerprinting for OS detection.This is done by crafting custom TCP and UDP packets and analyzing their responses. After generating various such probes and comparing the results to the Nmap-os-db database of more than 2,600 known OS fingerprints and provides the OS version. The fingerprint provides details such as the vendor name, OS name, OS generation, device type, and also their Common Platform Enumeration (CPE) representation. Nmap also provides an option for the user to submit the fingerprint obtained if it is not present in the Nmap database of operating signatures:

-O (Enable OS detection): This enables OS detection for an Nmap scan. This flag further has options that can be used in conjunction with it.
--osscan-limit: This option will reduce the scan time when a list of hosts is being scanned by skipping the hosts...