EUVD-2025-202703

Comprehensive Technical Analysis of EUVD-2025-202703

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-202703 pertains to an arbitrary file rename vulnerability in the /admin/filer.php component of EasyImages 2.0 v2.8.6 and below. This vulnerability allows attackers with Administrator privileges to execute arbitrary code by injecting a crafted payload into an uploaded file name.

Severity Evaluation:

• Base Score: 9.1
• Base Score Version: CVSS:3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

The CVSS score of 9.1 indicates a critical vulnerability. The key factors contributing to this high score include:

• Attack Vector (AV:N): The vulnerability can be exploited over the network.
• Attack Complexity (AC:L): The attack is of low complexity.
• Privileges Required (PR:H): High privileges (Administrator) are required to exploit the vulnerability.
• User Interaction (UI:N): No user interaction is required.
• Scope (S:C): The vulnerability affects components beyond the security scope.
• Confidentiality (C:H), Integrity (I:H), and Availability (A:H): All three are highly impacted.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attack: Given the AV:N vector, attackers can exploit this vulnerability remotely over the network.
• Administrator Privileges: The attacker must have Administrator privileges, which can be obtained through social engineering, credential theft, or other means.

Exploitation Methods:

• Crafted Payload Injection: The attacker can inject a crafted payload into the file name during the upload process. This payload can include malicious code that, when executed, can compromise the system.
• Arbitrary Code Execution: Once the payload is injected, the attacker can execute arbitrary code, leading to complete system compromise.

3. Affected Systems and Software Versions

Affected Software:

• EasyImages 2.0 v2.8.6 and below

Affected Systems:

• Any system running the vulnerable versions of EasyImages 2.0.
• Systems where the /admin/filer.php component is accessible and used by administrators.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Upgrade to a patched version of EasyImages 2.0 that addresses this vulnerability.
• Access Control: Restrict administrative access to trusted users only.
• Input Validation: Implement strict input validation for file names and other user inputs.
• Monitoring: Enhance monitoring and logging for suspicious activities related to file uploads and administrative actions.

Long-Term Mitigation:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• User Training: Educate users on the risks of social engineering and credential theft.
• Network Segmentation: Implement network segmentation to limit the spread of potential attacks.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the following reasons:

• Wide Adoption: EasyImages 2.0 is widely used in various sectors, including media, e-commerce, and content management systems.
• Critical Infrastructure: The vulnerability can affect critical infrastructure if EasyImages 2.0 is used in such environments.
• Regulatory Compliance: Organizations must ensure compliance with regulations such as GDPR, which mandates robust security measures to protect personal data.

6. Technical Details for Security Professionals

Technical Analysis:

• Vulnerable Component: /admin/filer.php
• Exploit Mechanism: The vulnerability arises from insufficient validation of file names during the upload process. An attacker can exploit this by injecting a payload that includes executable code.
• Payload Example: A crafted file name might include a script that, when processed by the server, executes malicious commands.

Detection and Response:

• Detection: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to monitor for unusual file upload activities.
• Response: Develop an incident response plan that includes steps for isolating affected systems, analyzing the payload, and mitigating the impact.

References:

• CongSec Analysis
• GitHub Gist
• NVD Detail

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and ensure the integrity and security of their systems.