ghsa-6fc8-4gx4-v693
Vulnerability from github
Impact
A specially crafted value of the Sec-Websocket-Protocol
header can be used to significantly slow down a ws server.
Proof of concept
```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); } ```
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 the maxHeaderSize
options.
Credits
The vulnerability was responsibly disclosed along with a fix in private by Robert McLaughlin from University of California, Santa Barbara.
{ "affected": [ { "package": { "ecosystem": "npm", "name": "ws" }, "ranges": [ { "events": [ { "introduced": "7.0.0" }, { "fixed": "7.4.6" } ], "type": "ECOSYSTEM" } ] }, { "package": { "ecosystem": "npm", "name": "ws" }, "ranges": [ { "events": [ { "introduced": "6.0.0" }, { "fixed": "6.2.2" } ], "type": "ECOSYSTEM" } ] }, { "package": { "ecosystem": "npm", "name": "ws" }, "ranges": [ { "events": [ { "introduced": "5.0.0" }, { "fixed": "5.2.3" } ], "type": "ECOSYSTEM" } ] } ], "aliases": [ "CVE-2021-32640" ], "database_specific": { "cwe_ids": [ "CWE-345", "CWE-400" ], "github_reviewed": true, "github_reviewed_at": "2021-05-28T18:18:04Z", "nvd_published_at": "2021-05-25T19:15:00Z", "severity": "MODERATE" }, "details": "### Impact\n\nA specially crafted value of the `Sec-Websocket-Protocol` header can be used to significantly slow down a ws server.\n\n### Proof of concept\n\n```js\nfor (const length of [1000, 2000, 4000, 8000, 16000, 32000]) {\n const value = \u0027b\u0027 + \u0027 \u0027.repeat(length) + \u0027x\u0027;\n const start = process.hrtime.bigint();\n\n value.trim().split(/ *, */);\n\n const end = process.hrtime.bigint();\n\n console.log(\u0027length = %d, time = %f ns\u0027, length, end - start);\n}\n```\n\n### Patches\n\nThe 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).\n\n### Workarounds\n\nIn 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.\n\n### Credits\n\nThe vulnerability was responsibly disclosed along with a fix in private by [Robert McLaughlin](https://github.com/robmcl4) from University of California, Santa Barbara.\n", "id": "GHSA-6fc8-4gx4-v693", "modified": "2021-10-06T22:05:51Z", "published": "2021-05-28T19:19:03Z", "references": [ { "type": "WEB", "url": "https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-32640" }, { "type": "WEB", "url": "https://github.com/websockets/ws/issues/1895" }, { "type": "WEB", "url": "https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff" }, { "type": "PACKAGE", "url": "https://github.com/websockets/ws" }, { "type": "WEB", "url": "https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30@%3Ccommits.tinkerpop.apache.org%3E" }, { "type": "WEB", "url": "https://security.netapp.com/advisory/ntap-20210706-0005" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "type": "CVSS_V3" } ], "summary": "ReDoS in Sec-Websocket-Protocol header" }
Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.