CVE-2020-7663

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.58%

Vendor Advisory ubuntu.com

Affected: n/a websocket-extensions (ruby)

References

Link	Tags
https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2	third party advisory
https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b	third party advisory patch
https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions	third party advisory
https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830	third party advisory exploit
https://lists.debian.org/debian-lts-announce/2020/08/msg00031.html	third party advisory mailing list
https://usn.ubuntu.com/4502-1/	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-7663?: CVE-2020-7663 has been scored as a high severity vulnerability.
How to fix CVE-2020-7663?: To fix CVE-2020-7663, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-7663 being actively exploited in the wild?: It is possible that CVE-2020-7663 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-7663?: CVE-2020-7663 affects n/a websocket-extensions (ruby).

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.