CVE-2020-15133

Name	CVE-2020-15133
Description	In faye-websocket before version 0.11.0, there is a lack of certification validation in TLS handshakes. The `Faye::WebSocket::Client` class uses the `EM::Connection#start_tls` method in EventMachine to implement the TLS handshake whenever a `wss:` URL is used for the connection. This method does not implement certificate verification by default, meaning that it does not check that the server presents a valid and trusted TLS certificate for the expected hostname. That means that any `wss:` connection made using this library is vulnerable to a man-in-the-middle attack, since it does not confirm the identity of the server it is connected to. For further background information on this issue, please see the referenced GitHub Advisory. Upgrading `faye-websocket` to v0.11.0 is recommended.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	967061

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ruby-faye-websocket (PTS)	buster	0.10.7-1	vulnerable
	sid, trixie, bookworm, bullseye	0.11.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ruby-faye-websocket	source	(unstable)	0.11.0-1			967061

Notes

[buster] - ruby-faye-websocket <no-dsa> (Minor issue)
https://github.com/faye/faye-websocket-ruby/security/advisories/GHSA-2v5c-755p-p4gv
https://github.com/faye/faye-websocket-ruby/pull/129
https://blog.jcoglan.com/2020/07/31/missing-tls-verification-in-faye/