CVE-2025-63604: Critical Code Injection Vulnerability in mcp-server-aws-resources-python 0.1.0

Overview

CVE-2025-63604 is a critical code injection vulnerability found in baryhuang/mcp-server-aws-resources-python version 0.1.0. This vulnerability allows for remote code execution due to insufficient input validation within the execute_query method. The exposure of dangerous Python built-in functions and the use of exec() to process user-supplied code make the application highly susceptible to malicious attacks.

Technical Details

The root cause of this vulnerability lies in the application’s handling of user-provided input within the execute_query method. The application exposes dangerous Python built-in functions such as __import__, getattr, and hasattr in the execution namespace. Combined with the use of exec() to execute user-supplied code, an attacker can inject arbitrary Python code into the application.

This allows an attacker to bypass intended security controls and execute malicious commands on the server. The attacker can leverage this vulnerability to:

• Steal AWS credentials (AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY).
• Gain access to the file system.
• Disclose environment variables.
• Potentially compromise the entire system.

The direct use of exec() with untrusted input is a well-known security risk and should be avoided. Secure alternatives, such as whitelisting allowed operations or using a sandboxed environment, should be employed instead.

CVSS Analysis

Unfortunately, a CVSS score has not been provided for CVE-2025-63604 at the time of writing. However, given the ability to achieve remote code execution and potentially steal sensitive AWS credentials, this vulnerability should be considered critical. Awaiting further information regarding score.

Possible Impact

The impact of exploiting CVE-2025-63604 is significant. A successful attack could lead to:

• AWS Account Compromise: Theft of AWS credentials allows the attacker to access and control the organization’s AWS resources.
• Data Breach: Access to the file system and environment variables could expose sensitive data.
• System Takeover: Remote code execution provides the attacker with the ability to completely control the affected server.
• Denial of Service: An attacker could disrupt services by modifying or deleting critical files.

This vulnerability can have serious consequences for organizations using baryhuang/mcp-server-aws-resources-python 0.1.0.

Mitigation and Patch Steps

To mitigate this vulnerability, the following steps should be taken immediately:

1. Upgrade: If a patched version of baryhuang/mcp-server-aws-resources-python is available, upgrade to the latest version as soon as possible. Check the project’s repository for updates.
2. Input Validation: Implement robust input validation to sanitize user-supplied data. Specifically, remove dangerous functions and ensure that no potentially malicious code can be executed.
3. Avoid exec(): Replace the use of exec() with safer alternatives. Consider whitelisting allowed commands or using a sandboxed environment for code execution.
4. Principle of Least Privilege: Limit the permissions of the application’s user account to only the necessary resources.
5. Web Application Firewall (WAF): Deploy a WAF to detect and block malicious requests targeting the vulnerable endpoint.