CVE-2020-7663
Publication date 2 June 2020
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
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.
Status
Package | Ubuntu Release | Status |
---|---|---|
ruby-websocket-extensions | 22.04 LTS jammy |
Not affected
|
20.04 LTS focal |
Fixed 0.1.2-1+deb9u1build0.20.04.1
|
|
18.04 LTS bionic |
Fixed 0.1.2-1+deb9u1build0.18.04.1
|
|
16.04 LTS xenial |
Fixed 0.1.2-1+deb9u1build0.16.04.1
|
|
14.04 LTS trusty | Not in release |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 · High |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-4502-1
- websocket-extensions vulnerability
- 16 September 2020
Other references
- 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://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830
- https://www.cve.org/CVERecord?id=CVE-2020-7663