GHSA-g78m-2chm-r7qv
Regular Expression Denial of Service in websocket-extensions (NPM package)
At a glance
- Published
- Updated
- CVE
- CVE-2020-7662
- Aliases
- SNYK-JS-WEBSOCKETEXTENSIONS-570623
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Description
### Impact The ReDoS flaw allows an attacker to exhaust the server's capacity to process incoming requests by sending a WebSocket handshake request containing a header of the following form: Sec-WebSocket-Extensions: a; b="\c\c\c\c\c\c\c\c\c\c ... That is, a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. The parser takes exponential time to reject this header as invalid, and this will block the processing of any other work on the same thread. Thus if you are running a single-threaded server, such a request can render your service completely unavailable. ### Patches Users should upgrade to version 0.1.4. ### Workarounds There are no known work-arounds other than disabling any public-facing WebSocket functionality you are operating. ### References - https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions/
Affected packages
| Package | Versions |
|---|---|
| npm · websocket-extensions | introduced 0, fixed 0.1.4 |
References
- https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv WEB
- https://nvd.nist.gov/vuln/detail/CVE-2020-7662 ADVISORY
- https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237 WEB
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions WEB
- https://github.com/faye/websocket-extensions-node PACKAGE
- https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |