CVEs-PoC/2020/CVE-2020-7663.md

CVE-2020-7663

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.

POC

Reference

• https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830

Github

• https://github.com/ARPSyndicate/cvemon
• https://github.com/Live-Hack-CVE/CVE-2020-7663
• https://github.com/PalindromeLabs/awesome-websocket-security
• https://github.com/upsideon/shoveler