CVE-2025-63604 is a remote code execution vulnerability found in version 0.1.0 of the baryhuang/mcp-server-aws-resources-python package. The flaw exists in the execute_query method, which executes user-supplied queries using Python's exec() function without sufficient input validation or sanitization. The execution environment exposes dangerous Python built-in functions such as __import__, getattr, and hasattr, which attackers can leverage to execute arbitrary Python code. This allows attackers to perform malicious actions including stealing AWS credentials (AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY) from environment variables, accessing the file system, and disclosing sensitive environment information. The vulnerability bypasses intended security controls, enabling unauthorized access to AWS resources managed by the server. The attack vector is network-based, requiring no privileges or user interaction, making it highly accessible to remote attackers. The CVSS score of 6.5 reflects a medium severity, primarily due to the confidentiality and integrity impacts, while availability impact is minimal. No patches or known exploits are currently available, highlighting the need for immediate attention from users of this package. The underlying CWE is CWE-77 (Improper Neutralization of Special Elements used in a Command), indicating command injection risks. This vulnerability poses a significant risk to cloud environments relying on this package for AWS resource management, as compromised credentials can lead to broader cloud infrastructure compromise.

For European organizations, the impact of CVE-2025-63604 can be substantial, especially for those heavily reliant on AWS cloud services and using the affected package for resource management. Successful exploitation can lead to theft of AWS credentials, enabling attackers to access, modify, or delete cloud resources, potentially causing data breaches, service disruptions, and financial losses. Confidentiality is primarily at risk due to credential exposure and environment variable disclosure. Integrity is also threatened as attackers can execute arbitrary code and manipulate system or cloud resources. Although availability impact is rated low, indirect effects such as resource misuse or deletion can cause operational downtime. Organizations in sectors with stringent data protection regulations (e.g., GDPR) may face compliance violations and reputational damage if breaches occur. The vulnerability's ease of exploitation without authentication or user interaction increases the risk of automated attacks and widespread exploitation if left unmitigated. European cloud service providers and enterprises with critical infrastructure hosted on AWS are particularly vulnerable, necessitating urgent remediation to prevent potential large-scale compromises.

To mitigate CVE-2025-63604, organizations should immediately audit their use of the baryhuang/mcp-server-aws-resources-python package and avoid using version 0.1.0 until a patched version is available. Developers must remove or restrict access to dangerous Python built-ins (__import__, getattr, hasattr) from execution namespaces to prevent abuse. Avoid using exec() on untrusted user input; instead, implement safer query parsing and execution methods that do not rely on dynamic code execution. Employ strict input validation and sanitization to neutralize potentially malicious payloads. Implement sandboxing or restricted execution environments to limit the scope of code execution and prevent access to sensitive environment variables and file systems. Rotate AWS credentials immediately if compromise is suspected and enforce least privilege principles on AWS IAM roles to minimize damage. Monitor logs for unusual query patterns or execution attempts indicative of exploitation. Additionally, adopt runtime application self-protection (RASP) and intrusion detection systems tailored for cloud environments to detect and block exploitation attempts. Finally, maintain up-to-date inventory of third-party packages and apply security patches promptly once available.