CVEvulnerability
CVE-2020-7663
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2020-06-02
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
Description
websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.
Affected configurations
• websocket-extensions project websocket-extensions (< 0.1.5)
• debian debian linux 9.0
• canonical ubuntu linux 16.04
• canonical ubuntu linux 18.04
• canonical ubuntu linux 20.04
References
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions Third Party Advisory
- https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b Patch, Third Party Advisory
- https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2 Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00031.html Mailing List, Third Party Advisory
- https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830 Exploit, Third Party Advisory
- https://usn.ubuntu.com/4502-1/ Third Party Advisory
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions Third Party Advisory
- https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b Patch, Third Party Advisory
- https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2 Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00031.html Mailing List, Third Party Advisory
- https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830 Exploit, Third Party Advisory
- https://usn.ubuntu.com/4502-1/ Third Party Advisory