EUVD-2025-21611

Comprehensive Technical Analysis of EUVD-2025-21611

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-21611 pertains to a Deserialization of Untrusted Data issue in Codexpert, Inc's CoSchool LMS, which allows for Object Injection. This type of vulnerability is particularly severe because it can lead to arbitrary code execution, data manipulation, and other critical security breaches.

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 CVSS score of 9.8 indicates a critical vulnerability. The vector string breaks down as follows:

• AV:N (Attack Vector: Network) - The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low) - The attack requires low complexity to exploit.
• PR:N (Privileges Required: None) - No privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None) - No user interaction is required.
• S:U (Scope: Unchanged) - The vulnerability does not change the security scope.
• C:H (Confidentiality: High) - There is a high impact on confidentiality.
• I:H (Integrity: High) - There is a high impact on integrity.
• A:H (Availability: High) - There is a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Given the CVSS vector, the vulnerability can be exploited over the network, making it accessible to remote attackers.
• Web Application Exploits: Since CoSchool LMS is a web-based application, attackers can exploit this vulnerability through crafted HTTP requests.

Exploitation Methods:

• Deserialization Attacks: Attackers can send specially crafted serialized data to the application, which, when deserialized, can lead to object injection.
• Remote Code Execution (RCE): By injecting malicious objects, attackers can execute arbitrary code on the server, leading to full system compromise.

3. Affected Systems and Software Versions

Affected Software:

• CoSchool LMS: Versions from n/a through 1.4.3.

Vendor:

• Codexpert, Inc

Product:

• CoSchool LMS

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Apply the latest security patches provided by Codexpert, Inc.
• Input Validation: Implement strict input validation to ensure that only trusted data is deserialized.
• Serialization Libraries: Use secure serialization libraries that prevent object injection.
• Network Segmentation: Segment the network to limit the attack surface and reduce the impact of a successful exploit.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.
• Security Training: Provide training for developers on secure coding practices, especially regarding deserialization.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activities related to deserialization attacks.

5. Impact on European Cybersecurity Landscape

The high severity of this vulnerability poses significant risks to educational institutions and organizations using CoSchool LMS within the European Union. Given the critical nature of the vulnerability, it could lead to:

• Data Breaches: Unauthorized access to sensitive student and institutional data.
• Service Disruptions: Compromise of the LMS could lead to disruptions in educational services.
• Reputation Damage: Institutions affected by this vulnerability may suffer reputational damage.

Regulatory Compliance:

• GDPR: Organizations must ensure compliance with GDPR by protecting personal data and reporting breaches promptly.
• NIS Directive: Critical infrastructure providers must adhere to the Network and Information Systems (NIS) Directive to maintain security standards.

6. Technical Details for Security Professionals

Technical Overview:

• Deserialization Process: The vulnerability arises from the deserialization of untrusted data, which can be manipulated to inject malicious objects.
• Object Injection: The injection of malicious objects can lead to arbitrary code execution, data manipulation, and other critical security issues.

Detection and Response:

• Log Analysis: Monitor logs for unusual deserialization activities and errors.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalies in application behavior.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any exploitation attempts.

Code Review:

• Serialization Libraries: Ensure that the application uses secure serialization libraries and practices.
• Input Sanitization: Implement robust input sanitization to prevent the injection of malicious data.

Conclusion: The Deserialization of Untrusted Data vulnerability in CoSchool LMS is a critical issue that requires immediate attention. Organizations should prioritize patching, implement robust security measures, and conduct regular audits to mitigate the risks associated with this vulnerability. The impact on the European cybersecurity landscape underscores the importance of proactive security management and compliance with regulatory standards.

References:

• Patchstack Vulnerability Report
• CVE ID: CVE-2025-30973
• ENISA ID Product: 30b4e5ee-29a7-3962-afbe-85ec8f870ec9
• ENISA ID Vendor: 74da4282-406e-3c1c-a1a6-88f4b3984c4a