CVE-2025-63604 is a code injection vulnerability identified in version 0.1.0 of the baryhuang/mcp-server-aws-resources-python package. The vulnerability exists due to insufficient input validation in the execute_query method, which executes user-supplied code using Python's exec() function within an execution namespace that exposes dangerous built-in functions such as __import__, getattr, and hasattr. This design flaw allows an attacker to craft malicious queries that execute arbitrary Python code remotely. The consequences of successful exploitation include theft of AWS credentials (AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY), unauthorized access to the file system, disclosure of environment variables, and potential full system compromise. Because the package interacts with AWS resources, attackers gaining control can manipulate or exfiltrate sensitive cloud assets, escalate privileges, or pivot within the victim's infrastructure. The vulnerability bypasses intended security controls by leveraging the exposed execution environment and unsafe code execution patterns. No official CVSS score has been assigned yet, but the vulnerability's nature indicates a high severity level. No known exploits are currently reported in the wild, but the risk remains significant given the ease of exploitation and potential impact. The vulnerability highlights the dangers of executing user input without strict sanitization and the risks of exposing powerful built-ins in execution contexts.

For European organizations, especially those heavily reliant on AWS cloud infrastructure and using the baryhuang/mcp-server-aws-resources-python package, this vulnerability poses a critical risk. Successful exploitation can lead to unauthorized access to AWS credentials, enabling attackers to manipulate cloud resources, steal sensitive data, disrupt services, or launch further attacks within the cloud environment. The compromise of AWS credentials can result in data breaches, service outages, financial losses, and reputational damage. Additionally, access to the underlying file system and environment variables can facilitate lateral movement and persistence within affected systems. Given the increasing adoption of cloud services across Europe, the potential impact extends to sectors such as finance, healthcare, government, and critical infrastructure. The vulnerability undermines trust in cloud security and may lead to regulatory compliance issues under GDPR and other data protection frameworks if sensitive data is exposed or mishandled.

To mitigate CVE-2025-63604, organizations should immediately audit their use of the baryhuang/mcp-server-aws-resources-python package and identify any deployments of version 0.1.0. Since no official patch links are available, developers must remove or refactor the execute_query method to eliminate the use of exec() on user-supplied input. Restricting or removing access to dangerous Python built-ins (__import__, getattr, hasattr) in execution namespaces is critical. Implement strict input validation and sanitization to prevent injection of malicious code. Employ the principle of least privilege for AWS credentials, using IAM roles with minimal permissions and rotating credentials regularly. Monitor logs for suspicious query patterns or unexpected code execution attempts. Consider deploying runtime application self-protection (RASP) or behavior-based anomaly detection to identify exploitation attempts. If feasible, replace the vulnerable package with a more secure alternative or isolate its execution environment using containerization or sandboxing to limit potential damage.