If you are familiar with Javascript you will quickly understand what is going on using the destructuring property of Objects two variables can be unpacked from the query string: both timeout and the invisible hangul filler variable. In the following paragraph, I’m going to use the same snippet of code used by Wolfgang to provide you with a working example of an Invisible Backdoor in Node.js.Ĭan you spot the backdoor in the following snippet of code? const express = require('express') const util = require('util') const exec = util.promisify(require('child_process').exec) const app = express() app.get('/network_health', async (req, res) => = req.query Īnd you will find the same on the following line, when all the commands to execute are defined: const checkCommands = What is an Invisible BackdoorĪn Invisible Backdoor is a vulnerability that was described a couple of weeks ago by Wolfgang Ettlinger at Certitude. In fact, as you can see from the post title, I want to specifically talk about Invisible Backdoors in Javascript and how to detect them so without hesitation let’s quickly explain what an Invisible Backdoor is.
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