PT-2020-19690 · Npm · Websocket-Extensions

Published 2020-06-02 · Updated 2020-12-23 · CVE-2020-7662

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions websocket-extensions npm module versions prior to 0.1.4

Description The issue allows for Denial of Service (DoS) via Regex Backtracking. An attacker can exploit this by sending a malicious payload with the Sec-WebSocket-Extensions header, causing the extension parser to take quadratic time when parsing a header containing an unclosed string parameter value. This could lead to exhausting the server's capacity to process incoming requests, rendering the service completely unavailable, especially on single-threaded servers.

Recommendations For versions prior to 0.1.4, upgrade to version 0.1.4 to resolve the issue. As a temporary workaround, consider disabling any public-facing WebSocket functionality until the upgrade is applied.

Exploit

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

AZL-44202

CVE-2020-7662

GHSA-G78M-2CHM-R7QV

RHSA-2020:2796

RHSA-2020:2861

SNYK-JS-WEBSOCKETEXTENSIONS-570623

Affected Products

Websocket-Extensions

References · 9

• 🔥 https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv · Exploit
• 🔥 https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623 · Exploit
• 🔥 https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions · Exploit
• https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237 · Patch
• https://osv.dev/vulnerability/GHSA-g78m-2chm-r7qv · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-7662 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-7662 · Security Note
• https://osv.dev/vulnerability/AZL-44202 · Vendor Advisory
• https://github.com/faye/websocket-extensions-node · Note