EUVD-2024-44940

Comprehensive Technical Analysis of EUVD-2024-44940

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-44940, also known as CVE-2024-50527, is classified as an "Unrestricted Upload of File with Dangerous Type" in the Stacks Mobile App Builder. This vulnerability allows an attacker to upload a web shell to a web server, which can lead to remote code execution (RCE). The CVSS (Common Vulnerability Scoring System) base score of 10.0 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H breaks down as follows:

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

This score signifies that the vulnerability is highly exploitable and can result in severe impacts on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is the unrestricted file upload functionality in the Stacks Mobile App Builder. An attacker can exploit this by:

• Uploading a Web Shell: The attacker can upload a malicious file, such as a PHP web shell, which allows them to execute arbitrary commands on the server.
• Remote Code Execution (RCE): Once the web shell is uploaded, the attacker can execute commands remotely, leading to full control over the server.
• Data Exfiltration: The attacker can exfiltrate sensitive data, including user credentials, configuration files, and other critical information.
• Lateral Movement: The attacker can use the compromised server as a pivot point to move laterally within the network, compromising other systems.

3. Affected Systems and Software Versions

The vulnerability affects the Stacks Mobile App Builder from version n/a through 5.2.3. This means that all versions up to and including 5.2.3 are vulnerable. Users of these versions should prioritize updating to a patched version as soon as possible.

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following steps should be taken:

• Update to the Latest Version: Ensure that the Stacks Mobile App Builder is updated to a version that includes the patch for this vulnerability.
• Implement File Upload Restrictions: Configure the application to restrict file uploads to only allowed file types and sizes.
• Use Web Application Firewalls (WAF): Deploy WAFs to monitor and block suspicious file uploads.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.
• Monitor for Suspicious Activity: Implement monitoring and logging to detect any unusual file uploads or access patterns.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of mobile app builders and the potential for data breaches and system compromises. Organizations and individuals using the Stacks Mobile App Builder are at risk of severe data breaches, financial loss, and reputational damage. The critical nature of the vulnerability underscores the need for robust cybersecurity measures and timely patch management.

6. Technical Details for Security Professionals

For security professionals, the following technical details are crucial:

• Detection: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to detect and block malicious file uploads.
• Incident Response: Develop an incident response plan that includes steps for identifying, containing, and remediating the vulnerability.
• Patch Management: Ensure that a patch management process is in place to quickly apply updates and patches for known vulnerabilities.
• User Education: Educate users about the risks of uploading files from untrusted sources and the importance of following security best practices.
• Code Review: Conduct thorough code reviews to identify and fix similar vulnerabilities in other applications.

By addressing these points, organizations can significantly reduce the risk associated with this critical vulnerability and enhance their overall cybersecurity posture.