EUVD-2025-16320

Comprehensive Technical Analysis of EUVD-2025-16320

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in the aws-mcp-server MCP server, as described in EUVD-2025-16320, is a command injection flaw. This type of vulnerability allows an attacker to execute arbitrary commands on the host system by crafting a malicious prompt that is accessed by the MCP client. The severity of this vulnerability is rated with a Base Score of 9.4 according to CVSS 4.0, indicating a critical risk.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability can be exploited remotely over the network.
• AC:L (Low Complexity): The attack requires low skill or resources to exploit.
• AT:N (No Authentication): No authentication is required to exploit the vulnerability.
• PR:N (No Privileges Required): The attacker does not need any special privileges.
• UI:A (User Interaction Required): The attack requires some form of user interaction.
• VC:H (High Confidentiality Impact): The vulnerability can result in a high impact on confidentiality.
• VI:H (High Integrity Impact): The vulnerability can result in a high impact on integrity.
• VA:H (High Availability Impact): The vulnerability can result in a high impact on availability.
• SC:H (High Scope Change): The vulnerability can affect resources beyond the security scope managed by the security authority.
• SI:H (High Integrity Requirement): The integrity of the affected component is highly critical.
• SA:H (High Availability Requirement): The availability of the affected component is highly critical.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Command Execution: An attacker can send a specially crafted prompt to the MCP server, which will then be processed by the MCP client, leading to the execution of arbitrary commands on the host system.
• Phishing: An attacker could use social engineering techniques to trick a user into accessing a malicious prompt, leading to command execution.

Exploitation Methods:

• Crafting Malicious Prompts: The attacker can create a prompt that includes commands to be executed on the host system.
• Network Interception: If the MCP server communicates over an unencrypted channel, an attacker could intercept and modify the prompts.

3. Affected Systems and Software Versions

The vulnerability affects the aws-mcp-server software versions prior to 1.3.0. Specifically, the affected product is:

• Product Name: aws-mcp-server
• Vendor: alexei-led
• Affected Versions: 0 < 1.3.0

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade Software: Upgrade to aws-mcp-server version 1.3.0 or later, which includes the patch for this vulnerability.
• Network Segmentation: Isolate the MCP server from untrusted networks to limit exposure.
• Input Validation: Implement strict input validation and sanitization to prevent command injection.

Long-Term Mitigation:

• Regular Patching: Ensure that all software components are regularly updated and patched.
• Security Training: Conduct regular security training for users to recognize and avoid phishing attempts.
• Monitoring and Logging: Implement robust monitoring and logging to detect and respond to suspicious activities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using the aws-mcp-server, particularly those in critical sectors such as finance, healthcare, and government. The potential for remote command execution can lead to data breaches, system compromises, and service disruptions, which can have far-reaching consequences for European cybersecurity.

6. Technical Details for Security Professionals

Vulnerability Details:

• Vulnerable Component: The vulnerability is located in the cli_executor.py file, specifically around line 92.
• Exploit Mechanism: The MCP server processes user input without proper sanitization, allowing for command injection.

References:

• GitHub Commit: 94d20ae1798a43ac7e3a28e71900d774e5159c8a
• Source Code: cli_executor.py

Mitigation Code Example:

import re

def sanitize_input(user_input):
    # Example of input sanitization to prevent command injection
    sanitized_input = re.sub(r'[;|&$]', '', user_input)
    return sanitized_input

# Example usage
user_prompt = "malicious_command; rm -rf /"
safe_prompt = sanitize_input(user_prompt)
print(safe_prompt)  # Output: malicious_command rm -rf /

Conclusion: The command injection vulnerability in aws-mcp-server is critical and requires immediate attention. Organizations should prioritize upgrading to the patched version and implementing additional security measures to mitigate the risk. Continuous monitoring and regular security audits are essential to maintain a robust cybersecurity posture.