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Nmap: Network Exploration and Security Auditing Cookbook

You're reading from   Nmap: Network Exploration and Security Auditing Cookbook Network discovery and security scanning at your fingertips

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Product type Paperback
Published in May 2017
Publisher
ISBN-13 9781786467454
Length 416 pages
Edition 2nd Edition
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Author (1):
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Paulino Calderon Paulino Calderon
Author Profile Icon Paulino Calderon
Paulino Calderon
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Table of Contents (18) Chapters Close

Preface 1. Nmap Fundamentals 2. Network Exploration FREE CHAPTER 3. Reconnaissance Tasks 4. Scanning Web Servers 5. Scanning Databases 6. Scanning Mail Servers 7. Scanning Windows Systems 8. Scanning ICS SCADA Systems 9. Optimizing Scans 10. Generating Scan Reports 11. Writing Your Own NSE Scripts 12. HTTP, HTTP Pipelining, and Web Crawling Configuration Options 13. Brute Force Password Auditing Options 14. NSE Debugging 15. Additional Output Options 16. Introduction to Lua 17. References and Additional Reading

Detecting XSS vulnerabilities


XSS vulnerabilities allow attackers to spoof content, steal user cookies, and even execute malicious code on the user's browsers. There are even advanced exploitation frameworks such as Beef that allow attackers to perform complex attacks through JavaScript hooks. Web penetration testers can use Nmap to discover these vulnerabilities in web servers in an automated manner.

This recipe shows how to find XSS vulnerabilities in web applications with Nmap NSE.

How to do it...

  1. To scan a web server looking for files vulnerable to XSS, we use the following command:
$ nmap -p80 --script http-unsafe-output-escaping <target>
  1. All the files suspected to be vulnerable will be listed in the results:
   PORT   STATE SERVICE REASON 
   80/tcp open  http   syn-ack 
   | http-unsafe-output-escaping:  
   |_  Characters [> " '] reflected in parameter id at            
   http://target/1.php?id=1 

The script output will also include the vulnerable parameter and which characters...

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