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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 0.11.0-1 |
| sid | Fixed | 0.11.0-1 |
| forky | Fixed | 0.11.0-1 |
| bullseye | Fixed | 0.11.0-1 |
| bookworm | Fixed | 0.11.0-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| RubyGems | faye-websocket | <>= 0.11.0 | >= 0.11.0 |
| RubyGems | faye-websocket | <0.11.0 | 0.11.0 |
References
- https://github.com/faye/faye-websocket-ruby/security/advisories/GHSA-2v5c-755p-p4gv
- https://nvd.nist.gov/vuln/detail/CVE-2020-15133
- https://github.com/eventmachine/eventmachine/issues/275
- https://github.com/eventmachine/eventmachine/issues/814
- https://github.com/faye/faye/issues/524
- https://github.com/eventmachine/eventmachine/pull/378
- https://github.com/faye/faye-websocket-ruby/pull/129
- https://github.com/igrigorik/em-http-request/pull/340
- https://blog.jcoglan.com/2020/07/31/missing-tls-verification-in-faye
- https://github.com/faye/faye-websocket-ruby
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/faye-websocket/CVE-2020-15133.yml
- https://securitylab.github.com/advisories/GHSL-2020-094-igrigorik-em-http-request
- https://www.rubydoc.info/github/eventmachine/eventmachine/EventMachine/Connection:ssl_verify_peer
- https://www.rubydoc.info/github/eventmachine/eventmachine/EventMachine/Connection:start_tls
- https://security-tracker.debian.org/tracker/CVE-2020-15133
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.