ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the `Sec-Websocket-Protocol` header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff). 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.
CVE-2021-32640 - Medium Severity Vulnerability
Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js
Library home page: https://registry.npmjs.org/ws/-/ws-7.4.4.tgz
Path to dependency file: /package.json
Path to vulnerable library: /node_modules/ws/package.json
Dependency Hierarchy: - karma-5.2.3.tgz (Root Library) - socket.io-2.4.1.tgz - engine.io-3.5.0.tgz - :x: **ws-7.4.4.tgz** (Vulnerable Library)
Found in HEAD commit: a5b8e9daecd28205c27d0fa32a6402d9e82238a7
Found in base branch: main
ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the `Sec-Websocket-Protocol` header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff). 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.
Publish Date: 2021-05-25
URL: CVE-2021-32640
Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: None - Integrity Impact: None - Availability Impact: Low
For more information on CVSS3 Scores, click here.Type: Upgrade version
Origin: https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693
Release Date: 2021-05-25
Fix Resolution (ws): 7.4.6
Direct dependency fix Resolution (karma): 6.0.0
:rescue_worker_helmet: Automatic Remediation is available for this issue