Server-Side Request Forgery in Alibaba Cloud DataWorks MCP Server

Executive Summary

This is a Server-Side Request Forgery (SSRF) vulnerability in aliyun alibabacloud-dataworks-mcp-server up to version 1.0.43. It exists in the ReadResourceRequestSchema function of src/resources/initResources.ts. The flaw allows attackers to manipulate the request.params.uri parameter to force the server to make HTTP requests to arbitrary internal or restricted resources like localhost or private networks. The server fetches content from any HTTP URL without proper validation, enabling potential exposure of sensitive information.

Useful 0 Not Useful 0

Detection Guidance

To detect this SSRF vulnerability, monitor network traffic for unexpected outbound requests from the aliyun alibabacloud-dataworks-mcp-server process. Check logs for fetch API calls to internal or restricted resources like localhost, private IPs, or metadata endpoints. Use tools like tcpdump or Wireshark to capture outbound connections from the server. Verify if the ReadResource handler accepts arbitrary URIs without validation.

• Check server logs for fetch API calls to unexpected URLs or internal resources.
• Use tcpdump -i any -w output.pcap to capture network traffic from the server process.
• Inspect the src/resources/initResources.ts file for URI parameter handling logic.

Useful 0 Not Useful 0

Impact Analysis

An attacker could exploit this to access internal services, retrieve sensitive data, or interact with restricted endpoints. This might lead to unauthorized information disclosure, internal network reconnaissance, or further attacks against internal systems. The impact depends on the server's network configuration and the data it can access.

Useful 0 Not Useful 0

Compliance Impact

This SSRF vulnerability could potentially violate compliance with GDPR and HIPAA by enabling unauthorized access to internal systems or sensitive data. GDPR requires protecting personal data, and HIPAA mandates securing protected health information. The flaw allows attackers to access internal resources, metadata endpoints, or private networks, which may expose sensitive information and lead to non-compliance with these regulations.

Useful 0 Not Useful 0

Mitigation Strategies

Immediately update to a patched version of aliyun alibabacloud-dataworks-mcp-server if available. If not, restrict the ReadResource handler to only allow URIs from expected domains. Block loopback, private, and non-public IP ranges. Validate DNS resolutions and avoid using arbitrary HTTP URLs. Disable the MCP ReadResource handler if not essential.

• Restrict URI fetching to allowlisted domains only.
• Block access to localhost, private IPs, and metadata endpoints.
• Validate DNS resolutions before fetching resources.

Useful 0 Not Useful 0