What is the CVSS score of CVE-2020-15133?

CVE-2020-15133 has a CVSS 3.1 base score of 8.7 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N. EPSS exploitation probability: 0.9%.

Is there a public PoC exploit available for CVE-2020-15133?

Yes, a public proof-of-concept exploit is available for CVE-2020-15133. Prioritise patching immediately. EPSS: 0.9%.

Is there a patch available for CVE-2020-15133?

Yes, a patch is available for CVE-2020-15133. Update the affected software to the latest version immediately.

Faye Websocket CVE-2020-15133

HIGH

Improper Certificate Validation (CWE-295)

2020-07-31 security-advisories@github.com

Information Disclosure Faye Websocket

8.7

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.7 HIGH

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

CVE Published

Jul 31, 2020 - 18:15 nvd

HIGH 8.7

DescriptionNVD

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.

AnalysisAI

In faye-websocket before version 0.11.0, there is a lack of certification validation in TLS handshakes. Rated high severity (CVSS 8.7), this vulnerability is remotely exploitable, no authentication required. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-295. 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. Affected products include: Faye-Websocket Project Faye-Websocket. Version information: version 0.11.0.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.