GHSA-g78m-2chm-r7qv

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Source
https://github.com/advisories/GHSA-g78m-2chm-r7qv
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/06/GHSA-g78m-2chm-r7qv/GHSA-g78m-2chm-r7qv.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-g78m-2chm-r7qv
Aliases
Published
2020-06-05T16:16:12Z
Modified
2023-11-08T04:04:03.425347Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
Summary
Regular Expression Denial of Service in websocket-extensions (NPM package)
Details

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/
References

Affected packages

npm / websocket-extensions

Package

Name
websocket-extensions
View open source insights on deps.dev
Purl
pkg:npm/websocket-extensions

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.1.4