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Python: Penetration Testing for Developers

You're reading from   Python: Penetration Testing for Developers Execute effective tests to identify software vulnerabilities

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Product type Course
Published in Oct 2016
Publisher Packt
ISBN-13 9781787128187
Length 650 pages
Edition 1st Edition
Languages
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Authors (6):
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Christopher Duffy Christopher Duffy
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Christopher Duffy
Mohit Raj Mohit Raj
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Mohit Raj
Dave Mound Dave Mound
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Dave Mound
Terry Ip Terry Ip
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Terry Ip
Cameron Buchanan Cameron Buchanan
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Cameron Buchanan
Andrew Mabbitt Andrew Mabbitt
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Andrew Mabbitt
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Table of Contents (32) Chapters Close

Python: Penetration Testing for Developers
Python: Penetration Testing for Developers
Credits
Preface
1. Understanding the Penetration Testing Methodology 2. The Basics of Python Scripting FREE CHAPTER 3. Identifying Targets with Nmap, Scapy, and Python 4. Executing Credential Attacks with Python 5. Exploiting Services with Python 6. Assessing Web Applications with Python 7. Cracking the Perimeter with Python 8. Exploit Development with Python, Metasploit, and Immunity 9. Automating Reports and Tasks with Python 10. Adding Permanency to Python Tools 11. Python with Penetration Testing and Networking 12. Scanning Pentesting 13. Sniffing and Penetration Testing 14. Wireless Pentesting 15. Foot Printing of a Web Server and a Web Application 16. Client-side and DDoS Attacks 17. Pentesting of SQLI and XSS 18. Gathering Open Source Intelligence 19. Enumeration 20. Vulnerability Identification 21. SQL Injection 22. Web Header Manipulation 23. Image Analysis and Manipulation 24. Encryption and Encoding 25. Payloads and Shells 26. Reporting Bibliography
Index

Testing for users using SMTP VRFY


Now that we have a list of usernames and we know that SMTP is open, we need to see if VRFY is enabled. This is extremely simple, all you do is telnet into port 25 and execute the command VRFY followed by a word and hit enter. The great part about checking for usernames this way is that if VRFY is enabled, something is wrong with the secure deployment practices, and if it is Internet facing, they are likely not monitoring it. Reduce the number of credential attack guesses in an online credential attack against an interface will reduce the chances of being caught. The simple commands to execute this are shown in the following figure:

We did not get a hit for smith, but perhaps others will confirm during this attack. Before we write our script, you need to know the different error or control messages that can be produced in most SMTP systems. These can vary and you should design your script well enough to be modified for that environment.

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