EUVD-2024-17275

Comprehensive Technical Analysis of EUVD-2024-17275

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-17275, also known as CVE-2024-1527, is an unrestricted file upload vulnerability in CMS Made Simple version 2.2.14. This vulnerability allows an authenticated user to bypass security measures during file uploads, potentially leading to remote command execution via a webshell.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high base score 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): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This vulnerability poses a significant risk as it can be exploited remotely with low complexity and does not require user interaction or special privileges.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated User Exploitation: An attacker with valid credentials can upload malicious files, bypassing the intended security checks.
• Webshell Deployment: Once a malicious file is uploaded, the attacker can execute arbitrary commands on the server, leading to full system compromise.

Exploitation Methods:

• File Upload Bypass: The attacker can manipulate the file upload functionality to upload a webshell or other malicious scripts.
• Remote Command Execution: The webshell can be used to execute commands, allowing the attacker to control the server remotely.

3. Affected Systems and Software Versions

Affected Software:

• CMS Made Simple version 2.2.14

Affected Systems:

• Any server or system running CMS Made Simple version 2.2.14 is at risk. This includes web servers, content management systems, and any other infrastructure utilizing this software.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Upgrade to the latest version of CMS Made Simple that addresses this vulnerability.
• Access Control: Restrict file upload permissions to trusted users only.
• Input Validation: Implement strict input validation and file type checks for uploaded files.
• Monitoring: Enable logging and monitoring for suspicious file upload activities.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• User Education: Train users on the importance of secure file upload practices.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to identify and respond to potential exploitation attempts.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations using CMS Made Simple. The potential for remote command execution can lead to data breaches, unauthorized access, and system downtime, impacting business operations and data integrity.

Regulatory Compliance:

• Organizations must ensure compliance with GDPR and other relevant regulations to protect user data and maintain trust.

Cybersecurity Awareness:

• Increased awareness and proactive measures are essential to mitigate the risk associated with this vulnerability.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2024-1527
• GSD ID: GSD-2024-1527
• Assigner: INCIBE
• EPSS Score: 1 (indicating a low likelihood of exploitation in the wild, but still a critical risk due to the severity)

Technical Mitigation:

• File Upload Security: Implement robust file upload security measures, including file type whitelisting, content scanning, and size limitations.
• Web Application Firewall (WAF): Deploy a WAF to filter out malicious file upload attempts.
• Incident Response: Develop and maintain an incident response plan to quickly address any detected exploitation attempts.

References:

• INCIBE Advisory

By addressing this vulnerability promptly and implementing the recommended mitigation strategies, organizations can significantly reduce the risk of exploitation and protect their systems from potential attacks.