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CVE-2020-15133

8.0 · HIGH

In faye-websocket before version 0.11.0, there is a lack of certification validation in TLS handshakes.

Published Jul 31, 2020CWE-295EPSS 1.06%

Overview

CVE-2020-15133 is a high-severity vulnerability. It was published on July 31, 2020 and has a CVSS 3.1 base score of 8.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.0, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refblog.jcoglan.com/2020/07/31/missing-tls-verification-in-faye/GitHubgithub.com/faye/faye-websocket-ruby/security/advisories/GHSA-2v5c-755p-p4gvRefblog.jcoglan.com/2020/07/31/missing-tls-verification-in-faye/GitHubgithub.com/faye/faye-websocket-ruby/security/advisories/GHSA-2v5c-755p-p4gv

How CyberStrike helps

Frequently asked questions

What is CVE-2020-15133?

CVE-2020-15133 is a high-severity vulnerability. It was published on July 31, 2020 and has a CVSS 3.1 base score of 8.0 (HIGH).

How severe is CVE-2020-15133?

This vulnerability has a CVSS 3.1 base score of 8.0, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-15133?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-15133?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-15133 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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