EUVD-2025-201274

Comprehensive Technical Analysis of EUVD-2025-201274

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-201274 affects UNA CMS versions 9.0.0-RC1 through 14.0.0-RC4. It involves a PHP object injection vulnerability in the BxBaseMenuSetAclLevel.php file, where the profile_id POST parameter is passed to the unserialize() function without proper handling. This allows remote, unauthenticated attackers to inject arbitrary PHP objects, potentially leading to arbitrary code execution.

Severity Evaluation:

• Base Score: 9.3 (Critical)
• Base Score Version: 4.0
• Base Score Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

The high base score indicates a critical vulnerability due to its potential for remote code execution, which can lead to significant impacts on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Code Execution (RCE): An attacker can exploit the vulnerability to execute arbitrary PHP code on the server.
• Data Manipulation: The attacker can manipulate the profile_id parameter to inject malicious PHP objects.
• Privilege Escalation: By injecting PHP objects, an attacker can potentially escalate privileges and gain unauthorized access to the system.

Exploitation Methods:

• Unserialize() Exploitation: The attacker can craft a specially designed POST request with a malicious profile_id parameter that, when passed to unserialize(), results in the execution of arbitrary PHP code.
• Payload Delivery: The attacker can deliver payloads through various means, including web forms, API endpoints, or direct HTTP requests.

3. Affected Systems and Software Versions

Affected Software:

• UNA CMS versions: 9.0.0-RC1 through 14.0.0-RC4

Systems:

• Any server running the affected versions of UNA CMS.
• Systems that have not applied the necessary patches or updates.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Apply the latest security patches provided by UNA CMS to mitigate the vulnerability.
• Upgrade: Upgrade to a version of UNA CMS that is not affected by this vulnerability.

Long-Term Mitigations:

• Input Validation: Implement strict input validation and sanitization for all user inputs, especially those passed to unserialize().
• Code Review: Conduct a thorough code review to identify and fix similar vulnerabilities.
• Security Audits: Regularly perform security audits and penetration testing to identify and mitigate potential vulnerabilities.

Additional Measures:

• Web Application Firewall (WAF): Deploy a WAF to filter out malicious requests.
• Monitoring: Implement continuous monitoring to detect and respond to suspicious activities.
• Access Controls: Enforce strict access controls and limit the privileges of users and services.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using UNA CMS within the European Union. Given the critical nature of the vulnerability, it can lead to data breaches, unauthorized access, and potential disruption of services. This underscores the importance of timely patching and adherence to best security practices to protect against such threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• File: BxBaseMenuSetAclLevel.php
• Parameter: profile_id
• Function: unserialize()

Exploitation Steps:

1. Craft Malicious Payload: Create a payload that exploits the unserialize() function.
2. Send POST Request: Send a POST request with the malicious profile_id parameter.
3. Execute Code: The server processes the request, leading to the execution of arbitrary PHP code.

Detection and Response:

• Log Analysis: Analyze server logs for suspicious POST requests targeting BxBaseMenuSetAclLevel.php.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on unusual activities.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any detected exploitation attempts.

References:

• NVD Entry
• GitHub Repository
• Karma InSecurity Advisory
• Exploit Database
• VulnCheck Advisory

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their systems from potential attacks.