Attack Chain

1. Attacker identifies a ThingsBoard IoT Platform 4.2.0 instance.
2. Attacker sends a crafted HTTP request to a vulnerable endpoint.
3. The request leverages the SSRF vulnerability to target an internal resource.
4. The ThingsBoard server processes the request and sends it to the specified internal resource.
5. The internal resource responds to the ThingsBoard server.
6. The ThingsBoard server relays the response back to the attacker.
7. Attacker analyzes the response to gather sensitive information about internal network configuration or access internal services.

Impact

Successful exploitation of this SSRF vulnerability could allow an attacker to access internal resources that are not directly exposed to the internet. This could lead to the disclosure of sensitive information, such as internal network configurations, API keys, or credentials. An attacker may also be able to leverage the SSRF vulnerability to interact with other internal services, potentially leading to further compromise of the system.

Recommendation

• Upgrade ThingsBoard IoT Platform to a version that addresses the SSRF vulnerability.
• Implement network segmentation to limit the impact of potential SSRF exploitation.
• Monitor web server logs for suspicious requests that may indicate SSRF attempts. Deploy the Sigma rule Detect ThingsBoard SSRF Attempt via HTTP Request to identify potential SSRF attacks in web server logs.
• Review and restrict access to internal resources from the ThingsBoard server.