EUVD-2025-18951

Comprehensive Technical Analysis of EUVD-2025-18951

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-18951 is a directory traversal flaw in the LocaleController component of Performave Convoy, a KVM server management panel. This vulnerability allows an unauthenticated remote attacker to include and execute arbitrary PHP files on the server by sending a specially crafted HTTP request with malicious locale and namespace parameters.

Severity Evaluation:

• Base Score: 10.0 (Critical)
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

The CVSS score of 10.0 indicates a critical vulnerability due to the following factors:

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

This vulnerability poses a significant risk as it can be exploited remotely without any user interaction or special privileges, leading to high impacts on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Remote Exploitation: An attacker can send a crafted HTTP request to the vulnerable endpoint, exploiting the directory traversal vulnerability.
• Malicious Parameters: The attacker can manipulate the locale and namespace parameters to traverse directories and include arbitrary PHP files.

Exploitation Methods:

• Directory Traversal: By manipulating the input parameters, the attacker can navigate through the server's file system.
• Arbitrary File Inclusion: The attacker can include and execute PHP files, potentially leading to remote code execution (RCE).

3. Affected Systems and Software Versions

Affected Versions:

• Convoy versions from 3.9.0-rc3 to before 4.4.1.

Affected Systems:

• Any server running the vulnerable versions of Convoy, particularly those used by hosting businesses for KVM server management.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to Convoy version 4.4.1 or later, which includes the patch for this vulnerability.
• Web Application Firewall (WAF): Implement strict WAF rules to block incoming requests targeting the vulnerable endpoints.

Long-Term Mitigation:

• Regular Patching: Ensure that all software, including Convoy, is regularly updated to the latest versions.
• Input Validation: Enhance input validation and sanitization to prevent directory traversal attacks.
• Monitoring: Implement continuous monitoring and logging to detect and respond to suspicious activities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European hosting businesses and data centers using Convoy for KVM server management. Successful exploitation could lead to data breaches, unauthorized access, and service disruptions, impacting the confidentiality, integrity, and availability of critical infrastructure.

Regulatory Implications:

• GDPR Compliance: Data breaches resulting from this vulnerability could lead to GDPR violations, resulting in legal and financial repercussions.
• Cybersecurity Directives: Organizations must comply with EU cybersecurity directives, such as NIS2, to ensure robust security measures are in place.

6. Technical Details for Security Professionals

Vulnerability Details:

• Component: LocaleController
• Vulnerable Parameters: locale, namespace
• Exploitation: Crafted HTTP requests can manipulate these parameters to traverse directories and include arbitrary PHP files.

Detection and Response:

• Log Analysis: Monitor server logs for unusual directory traversal attempts and suspicious HTTP requests.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on anomalous activities related to this vulnerability.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any detected exploitation attempts.

References:

• GitHub Security Advisory
• GitHub Commit

Conclusion: The directory traversal vulnerability in Convoy is critical and requires immediate attention. Organizations should prioritize upgrading to the patched version and implementing robust security measures to protect against potential exploitation. Continuous monitoring and adherence to regulatory requirements are essential to maintain a strong cybersecurity posture in the European landscape.