CVE-2020-7663
websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.53%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.53% probability · 91th percentile
- CISA KEV
- Not listed
- Affected
- websocket-extensions project/websocket-extensions · debian/debian linux · canonical/ubuntu linux
- Source
- report@snyk.io
References
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensionsThird Party Advisory
- https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838bPatch, Third Party Advisory
- https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00031.htmlMailing List, Third Party Advisory
- https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830Exploit, Third Party Advisory
- https://usn.ubuntu.com/4502-1/Third Party Advisory
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensionsThird Party Advisory
- https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838bPatch, Third Party Advisory
- https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00031.htmlMailing List, Third Party Advisory
- https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830Exploit, Third Party Advisory
- https://usn.ubuntu.com/4502-1/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.