In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the --max-http-header-size=size and/or the maxHeaderSize options.
Credits
The vulnerability was responsibly disclosed along with a fix in private by Robert McLaughlin from University of California, Santa Barbara.
Release Notes
websockets/ws (ws)
### [`v7.4.6`](https://redirect.github.com/websockets/ws/releases/tag/7.4.6)
[Compare Source](https://redirect.github.com/websockets/ws/compare/7.4.5...7.4.6)
### Bug fixes
- Fixed a ReDoS vulnerability ([`00c425e`](https://redirect.github.com/websockets/ws/commit/00c425ec)).
A specially crafted value of the `Sec-Websocket-Protocol` header could be used
to significantly slow down a ws server.
```js
for (const length of [1000, 2000, 4000, 8000, 16000, 32000]) {
const value = 'b' + ' '.repeat(length) + 'x';
const start = process.hrtime.bigint();
value.trim().split(/ *, */);
const end = process.hrtime.bigint();
console.log('length = %d, time = %f ns', length, end - start);
}
```
The vulnerability was responsibly disclosed along with a fix in private by
[Robert McLaughlin](https://redirect.github.com/robmcl4) from University of California, Santa Barbara.
In vulnerable versions of ws, the issue can be mitigated by reducing the maximum
allowed length of the request headers using the [`--max-http-header-size=size`](https://nodejs.org/api/cli.html#cli_max_http_header_size_size)
and/or the [`maxHeaderSize`](https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener) options.
Configuration
📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
[ ] If you want to rebase/retry this PR, check this box
This PR contains the following updates:
7.4.5
->7.4.6
GitHub Vulnerability Alerts
CVE-2021-32640
Impact
A specially crafted value of the
Sec-Websocket-Protocol
header can be used to significantly slow down a ws server.Proof of concept
Patches
The vulnerability was fixed in ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff) and backported to ws@6.2.2 (https://github.com/websockets/ws/commit/78c676d2a1acefbc05292e9f7ea0a9457704bf1b) and ws@5.2.3 (https://github.com/websockets/ws/commit/76d47c1479002022a3e4357b3c9f0e23a68d4cd2).
Workarounds
In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the
--max-http-header-size=size
and/or themaxHeaderSize
options.Credits
The vulnerability was responsibly disclosed along with a fix in private by Robert McLaughlin from University of California, Santa Barbara.
Release Notes
websockets/ws (ws)
### [`v7.4.6`](https://redirect.github.com/websockets/ws/releases/tag/7.4.6) [Compare Source](https://redirect.github.com/websockets/ws/compare/7.4.5...7.4.6) ### Bug fixes - Fixed a ReDoS vulnerability ([`00c425e`](https://redirect.github.com/websockets/ws/commit/00c425ec)). A specially crafted value of the `Sec-Websocket-Protocol` header could be used to significantly slow down a ws server. ```js for (const length of [1000, 2000, 4000, 8000, 16000, 32000]) { const value = 'b' + ' '.repeat(length) + 'x'; const start = process.hrtime.bigint(); value.trim().split(/ *, */); const end = process.hrtime.bigint(); console.log('length = %d, time = %f ns', length, end - start); } ``` The vulnerability was responsibly disclosed along with a fix in private by [Robert McLaughlin](https://redirect.github.com/robmcl4) from University of California, Santa Barbara. In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the [`--max-http-header-size=size`](https://nodejs.org/api/cli.html#cli_max_http_header_size_size) and/or the [`maxHeaderSize`](https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener) options.Configuration
📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
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