Vulnerability in Faye Faye-Websocket
CVE-2020-15133
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.
Vulnerability class: Improper Certificate Validation
EPSS: 0.009 (56.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.
Affected products
- Faye Faye-websocket — versions < 0.11.0
- Faye-websocket_project Faye-websocket
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Exploit, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15133?
- CVE-2020-15133 is a high-severity vulnerability in Faye Faye-Websocket, classified under Improper Certificate Validation. CVSS score: 8.0/10. Published 2020-07-31.
- How severe is CVE-2020-15133?
- High severity. CVSS v3 base score is 8.0 out of 10.
- Is CVE-2020-15133 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.