CVE-2020-15133 Missing TLS certificate verification in Faye Websocket
The Faye WebSocket library fails to verify TLS certificates, allowing attackers to perform man-in-the-middle attacks on secure connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-15133?
CVE-2020-15133 is a high-severity vulnerability in faye-websocket, published on 31 Jul 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-295
Which versions are affected by CVE-2020-15133?
2 open source packages ship an affected version, including faye-websocket. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
faye-websocket RubyGems | All versions | 0.11.0 |
faye-websocket RubyGems | All versions | 0.11.0 |
Products include Faye-Websocket Project Faye-Websocket.
How do I fix CVE-2020-15133?
Upgrade faye-websocket to 0.11.0 or later.
Is CVE-2020-15133 being exploited?
There is no known exploitation of CVE-2020-15133 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2020-15133, GHSA-2v5c-755p-p4gv, UBUNTU-CVE-2020-15133.