DbGate Remote Code Execution via JavaScript Injection

Executive Summary

This vulnerability exists in DbGate, a cross-platform database manager, in versions 7.1.8 and earlier. The issue is in the POST /runners/load-reader endpoint, which accepts a parameter called functionName. This parameter is directly inserted into a JavaScript code template without any sanitization or validation.

Because of this, an authenticated user with basic access (no special permissions required) can inject arbitrary JavaScript code that executes on the server with full process privileges. This bypasses the intended sandbox restrictions.

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Impact Analysis

An attacker with basic authenticated access can exploit this vulnerability to execute arbitrary operating system commands on the DbGate server with the privileges of the Node.js process.

• Execute arbitrary OS commands on the server.
• Read and write any files accessible to the Node.js process.
• Access and pivot to connected databases by reading stored connection credentials.
• Compromise the host system, including gaining root access within Docker containers.

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Compliance Impact

The vulnerability allows an authenticated user with basic access to execute arbitrary OS commands, read and write any files accessible to the process, and access database connection credentials. This can lead to unauthorized access, data breaches, and potential compromise of sensitive information.

Such unauthorized access and potential data breaches can negatively impact compliance with standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data, strict access controls, and prevention of unauthorized data disclosure.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious POST requests to the /runners/load-reader endpoint on the DbGate server.

Specifically, look for POST requests containing the functionName parameter with unusual or unexpected JavaScript code injections.

A possible detection method is to capture and analyze HTTP traffic to identify such crafted requests.

Example commands to detect suspicious activity might include using network monitoring tools like tcpdump or Wireshark to filter HTTP POST requests to /runners/load-reader.

• tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/runners/load-reader'
• Use web server logs to search for POST requests to /runners/load-reader with suspicious functionName parameters, e.g., grep 'POST /runners/load-reader' /var/log/nginx/access.log | grep functionName

Additionally, monitoring for unexpected child process executions or unusual file access on the DbGate server may help detect exploitation attempts.

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Mitigation Strategies

The immediate mitigation step is to upgrade DbGate to version 7.1.9 or later, where validation for function and file names has been added and security improvements have been implemented.

Until the upgrade can be applied, restrict access to the DbGate server to trusted users only, as the vulnerability requires authentication but no special permissions.

Consider monitoring and blocking suspicious POST requests to the /runners/load-reader endpoint to prevent exploitation.

Review and tighten network and application-level access controls to limit exposure.

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