CVEs-PoC/2020/CVE-2020-7662.md

CVE-2020-7662

Description

websocket-extensions npm module prior to 0.1.4 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.

POC

Reference

• https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623

Github

• https://github.com/PalindromeLabs/awesome-websocket-security
• https://github.com/engn33r/awesome-redos-security
• https://github.com/ossf-cve-benchmark/CVE-2020-7662