EUVD-2025-20823

Comprehensive Technical Analysis of EUVD-2025-20823

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability EUVD-2025-20823 affects the mcp-remote software, which is exposed to OS command injection when connecting to untrusted MCP servers. This occurs due to crafted input from the authorization_endpoint response URL.

Severity Evaluation: The vulnerability has a CVSS Base Score of 9.6, which is categorized as Critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H indicates the following:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): Required (R)
• Scope (S): Changed (C)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high severity score underscores the critical nature of the vulnerability, which can lead to significant impacts on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Untrusted MCP Servers: An attacker can exploit this vulnerability by setting up a malicious MCP server that crafts the authorization_endpoint response URL to include OS commands.
• Man-in-the-Middle (MitM) Attacks: An attacker could intercept and modify the authorization_endpoint response URL during transmission.

Exploitation Methods:

• Command Injection: The attacker can inject malicious OS commands into the authorization_endpoint response URL, which are then executed by the mcp-remote software.
• Remote Code Execution (RCE): Successful exploitation can lead to arbitrary code execution on the affected system, allowing the attacker to gain control over the system.

3. Affected Systems and Software Versions

Affected Systems:

• Systems running the mcp-remote software.
• Any environment where mcp-remote connects to untrusted or potentially compromised MCP servers.

Software Versions:

• Specific versions of mcp-remote that are vulnerable to this issue. The exact versions can be identified by reviewing the references provided in the EUVD entry.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Apply the latest security patches and updates for mcp-remote as provided by the vendor.
• Input Validation: Ensure that all input from the authorization_endpoint response URL is properly sanitized and validated.
• Network Segmentation: Isolate mcp-remote instances from untrusted networks and ensure that they only connect to trusted MCP servers.

Long-Term Mitigation:

• Code Review: Conduct a thorough code review to identify and fix similar vulnerabilities.
• Security Training: Educate developers and administrators on secure coding practices and the risks associated with command injection vulnerabilities.
• Regular Audits: Perform regular security audits and vulnerability assessments to identify and mitigate potential security issues.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Widespread Adoption: Given the widespread use of mcp-remote in various industries, this vulnerability poses a significant risk to European organizations.
• Critical Infrastructure: The potential for RCE can lead to severe disruptions in critical infrastructure, affecting essential services and operations.
• Data Breaches: The high confidentiality and integrity impact scores indicate that successful exploitation could result in data breaches, leading to loss of sensitive information.

Regulatory Compliance:

• GDPR: Organizations must ensure compliance with GDPR by implementing robust security measures to protect personal data.
• NIS Directive: Critical infrastructure providers must adhere to the Network and Information Systems (NIS) Directive, which mandates stringent security measures.

6. Technical Details for Security Professionals

Technical Analysis:

• Vulnerability Root Cause: The root cause is the lack of proper input validation and sanitization in the mcp-remote software when processing the authorization_endpoint response URL.
• Exploit Code: The crafted input in the response URL can include OS commands, which are executed by the vulnerable software.
• Detection: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to monitor for suspicious network activity and command injection attempts.
• Logging and Monitoring: Enable detailed logging and monitoring to detect and respond to any unusual activities related to mcp-remote connections.

References:

• JFROG Research: mcp-remote Command Injection RCE
• GitHub Commit: Fix for Command Injection
• JFROG Blog: Critical mcp-remote RCE Vulnerability

By addressing this vulnerability promptly and comprehensively, organizations can significantly reduce the risk of exploitation and ensure the security and integrity of their systems.