EUVD-2025-10502

Comprehensive Technical Analysis of EUVD-2025-10502

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified as EUVD-2025-10502 affects Yii 2 versions before 2.0.52. This issue is related to the mishandling of the attaching of behavior defined by an __class array key, which is a regression of CVE-2024-4990. The vulnerability has been exploited in the wild between February and April 2025.

Severity Evaluation:

• Base Score: 9.0
• Base Score Version: 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

The CVSS score of 9.0 indicates a critical vulnerability. The vector string highlights the following characteristics:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): High (H)
• 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 is severe due to its potential for high impact on confidentiality, integrity, and availability, even though the attack complexity is high.

2. Potential Attack Vectors and Exploitation Methods

The vulnerability can be exploited through the following methods:

• Remote Code Execution (RCE): An attacker could craft a malicious payload that exploits the mishandling of the __class array key to execute arbitrary code on the server.
• Deserialization Attacks: The vulnerability might allow an attacker to inject malicious objects into the application, leading to unauthorized actions or data manipulation.

Given that the attack complexity is high, the exploitation would likely require a sophisticated understanding of the Yii 2 framework and the specific context in which the __class array key is used.

3. Affected Systems and Software Versions

The vulnerability affects:

• Yii 2 versions before 2.0.52

All systems running these versions of Yii 2 are at risk and should be updated immediately.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following actions are recommended:

• Update to the Latest Version: Upgrade to Yii 2 version 2.0.52 or later, which includes the fix for this vulnerability.
• Patch Management: Implement a robust patch management process to ensure that all software dependencies are kept up-to-date.
• Code Review: Conduct a thorough code review to identify and remediate any instances where the __class array key is used improperly.
• Input Validation: Enhance input validation and sanitization mechanisms to prevent the injection of malicious data.
• Monitoring and Logging: Implement comprehensive monitoring and logging to detect and respond to any suspicious activities.

5. Impact on European Cybersecurity Landscape

The exploitation of this vulnerability in the wild underscores the importance of timely patching and proactive security measures. Given the widespread use of the Yii 2 framework in web applications, the potential impact on European organizations could be significant. This vulnerability highlights the need for:

• Enhanced Collaboration: Between security researchers, vendors, and organizations to quickly identify and mitigate vulnerabilities.
• Regulatory Compliance: Ensuring that organizations comply with relevant cybersecurity regulations and standards to protect sensitive data and maintain operational integrity.
• Public Awareness: Raising awareness among developers and IT professionals about the risks associated with outdated software and the importance of regular updates.

6. Technical Details for Security Professionals

Technical Overview:

• The vulnerability is related to the improper handling of the __class array key when attaching behavior in Yii 2.
• This issue is a regression of CVE-2024-4990, indicating that a previously fixed vulnerability has re-emerged due to changes in the codebase.

References:

• NVD Entry: CVE-2024-58136
• GitHub Pull Request: Pull Request 20232
• GitHub Commit: Commit 40fe496eda529fd1d933b56a1022ec32d3cd0b12
• Yii Framework News: Please Upgrade to Yii 2.0.52

Mitigation Steps:

1. Identify Affected Systems: Conduct an inventory of all systems running Yii 2 and identify those using versions before 2.0.52.
2. Update Software: Upgrade affected systems to Yii 2 version 2.0.52 or later.
3. Review Codebase: Perform a code review to ensure that the __class array key is handled correctly.
4. Implement Security Controls: Enhance security controls such as input validation, sanitization, and monitoring.

By following these steps, organizations can effectively mitigate the risks associated with EUVD-2025-10502 and protect their systems from potential exploitation.