CVE-2020-7663

 

Published at: - 02-06-2020 09:15

Last modified: - 20-01-2023 07:22

Total changes: - 2

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
• https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2
• https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b
• https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830
• [debian-lts-announce] 20200819 [SECURITY] [DLA 2334-1] ruby-websocket-extensions security update-Mailing List, Third Party Advisory
• USN-4502-1-Third Party Advisory

 

Keywords

NVD

 

CVE-2020-7663

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures