EUVD-2025-18868

Comprehensive Technical Analysis of EUVD-2025-18868

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-18868 affects the Innoshop application through version 0.4.1. It allows an authenticated attacker to exploit the File Manager functions in the admin panel to achieve remote code execution (RCE) on the server. The attacker can upload a crafted file and rename it to have a .php extension, bypassing the initial check that restricts uploaded files to image files. This vulnerability is severe due to its potential for complete system compromise.

Severity Evaluation:

• Base Score: 9.9 (Critical)
• Base Score Version: CVSS:3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

The high base score indicates that the vulnerability is critical, with a low attack complexity (AC:L), network vector (AV:N), and low privileges required (PR:L). The impact on confidentiality, integrity, and availability is high (C:H, I:H, A:L), and the scope is changed (S:C), meaning the vulnerability can affect components beyond its security scope.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Authenticated Access: The attacker must have valid credentials to access the admin panel.
2. File Upload: The attacker uploads a crafted file, which initially appears to be an image file.
3. File Renaming: Using a proxy tool like BurpSuite, the attacker bypasses frontend checks to rename the uploaded file to have a .php extension.
4. Code Execution: The attacker triggers the execution of the malicious code by making a GET request to the renamed file.

Exploitation Methods:

• Proxy Tools: Tools like BurpSuite can be used to intercept and modify HTTP requests, allowing the attacker to bypass frontend restrictions.
• Crafted Files: The attacker can create a file with embedded PHP code that, when renamed and executed, performs malicious actions on the server.

3. Affected Systems and Software Versions

Affected Software:

• InnoShop: Versions 0 ≤ 0.4.1

Affected Systems:

• Any server running the vulnerable versions of InnoShop.
• Systems where the admin panel is accessible over the network.

4. Recommended Mitigation Strategies

Immediate Mitigation:

1. Patching: Upgrade to a patched version of InnoShop that addresses this vulnerability.
2. Access Control: Restrict access to the admin panel to trusted IP addresses and enforce strong authentication mechanisms.
3. File Upload Restrictions: Implement server-side checks to validate file types and prevent the upload of executable files.
4. Monitoring: Use intrusion detection systems (IDS) and file integrity monitoring (FIM) to detect and alert on suspicious file uploads and modifications.

Long-Term Mitigation:

1. Regular Audits: Conduct regular security audits and code reviews to identify and fix similar vulnerabilities.
2. Security Training: Educate developers and administrators on secure coding practices and the importance of server-side validation.
3. Update Policies: Establish and enforce policies for timely updates and patches.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations using InnoShop, particularly those in e-commerce. The potential for RCE can lead to data breaches, financial loss, and reputational damage. Given the critical nature of the vulnerability, it underscores the need for robust cybersecurity measures and continuous monitoring within the European cybersecurity landscape.

6. Technical Details for Security Professionals

Technical Analysis:

• Initial Check Bypass: The application relies on frontend checks to restrict file extensions, which can be easily bypassed using proxy tools.
• Renaming Mechanism: The Rename Function in the admin panel allows changing the file extension to .php, enabling code execution.
• GET Request: A simple GET request to the renamed file triggers the execution of the embedded PHP code.

Detection and Response:

• Log Analysis: Monitor server logs for unusual file uploads and renaming activities.
• Intrusion Detection: Implement IDS rules to detect and alert on suspicious file uploads and modifications.
• Incident Response: Develop and test incident response plans to quickly identify and mitigate any exploitation attempts.

Conclusion: The vulnerability in InnoShop through version 0.4.1 is critical and requires immediate attention. Organizations should prioritize patching and implementing robust security measures to protect against potential exploitation. Continuous monitoring and regular security audits are essential to maintain a strong cybersecurity posture.