Nmap for Scriptors
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This document provides an overview of Nmap Scripting Engine (NSE) for security researchers looking to build NSE scripts. It covers the anatomy of an NSE script including required components like metadata, categories, portrules and actions. It also provides tips for scriptors like specifying the script directory, using debugging mode, and updating the script database. The goal is to provide a kickstart for researchers to learn how to create NSE scripts and proofs-of-concept.
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![Nmap Script Engine [NSE]
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Network Discovery
Version Detection
Vulnerability Detection
Malware Detection
Exploitation](https://image.slidesharecdn.com/nmapforscriptors-131106044748-phpapp01/85/Nmap-for-Scriptors-7-320.jpg)
![NSE Skelton
description =[[
Just to show the Skelton of an NSE script
]]
author = “Mr. X”
categories = {"safe", "discovery"}
require "shortport"
portrule = shortport.port_or_service({80,8080,443},{"http"},{"tcp"})
action = function(host,port)
return "Webserver found on port "..port.number
end](https://image.slidesharecdn.com/nmapforscriptors-131106044748-phpapp01/85/Nmap-for-Scriptors-9-320.jpg)
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- 1. Nmap for Scriptors Sanoop Thomas @s4n7h0
- 2. Disclaimer • This is very small session to accommodate some coding concept (I agree it’s a bad try) • We will try to cover up some very important points required • A kick start session for security researchers to know how NSE can be build and use to create PoCs
- 3. Some Wrong Questions I’m sure many of you must be familiar with Nmap; but still for those who are new…. • How many of you used Nmap ? • What about –A option ? • What are Nmap scripts ?
- 6. Script Path • Windows – C:Program Files (x86)Nmapscripts • Linux – /usr/share/nmap/scripts • In Backtrack – /usr/local/share/nmap/scripts
- 7. Nmap Script Engine [NSE] • • • • • Network Discovery Version Detection Vulnerability Detection Malware Detection Exploitation
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- 10. require • Import libraries • require "shortport“ • local shortport = require "shortport"
- 11. metadata • Includes description of script, author name, license information, etc. • Not much relevant; but will help the user to know what your script does
- 12. categories • Defines the type of your script – auth, broadcast, brute, default, discovery, dos, exploit, external, fuzzer, intrusive, malware, safe, version, vuln • Because you can run scripts with categories
- 13. Scan Smartly • • • • • • nmap --script “http-*” nmap --script “http-* and ftp-*” nmap --script “not brute” nmap --script “vuln,safe” nmap --script “vuln or safe” nmap --script “(vuln or safe) and not http-*”
- 14. portrule • Script executions are conditional • portrule = shortport.http • portrule = shortport.port_or_service(21, “ftp”)
- 15. action • The actual code to execute based of the portrule • A combination of LUA code and NMAP library calls action = function(host, port) -- code to execute end
- 16. Some Practical Approach • It’s coding – Means – giving life to a code snippet – So, • You need to know how, what, why etc.
- 17. Tips for Scriptors • Specify the script directory (--datadir) • Use debugging mode when running script (-d) • Update the script database once you are done with final make (--script-updatedb) • Use script trace (--script-trace)
- 19. Any Questions ? Thanks Sanoop Thomas @s4n7h0