CVE-2020-7663

high

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.

References

https://usn.ubuntu.com/4502-1/

https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830

https://lists.debian.org/debian-lts-announce/2020/08/msg00031.html

https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2

https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b

https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions

Details

Source: Mitre, NVD

Published: 2020-06-02

Updated: 2023-01-20

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High