CVE-2020-7663
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.
| Software | From | Fixed in |
|---|---|---|
| websocket-extensions_project / websocket-extensions | - | 0.1.5 |
| debian / debian_linux | 9.0 | 9.0.x |
| canonical / ubuntu_linux | 18.04 | 18.04.x |
| canonical / ubuntu_linux | 20.04 | 20.04.x |
| canonical / ubuntu_linux | 16.04 | 16.04.x |
websocket-extensions
|
- | 0.1.5 |
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
- https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b
- https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2
- https://lists.debian.org/debian-lts-announce/2020/08/msg00031.html
- https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830
- https://usn.ubuntu.com/4502-1/
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