EUVD-2025-19296

Comprehensive Technical Analysis of EUVD-2025-19296

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-19296 pertains to a Deserialization of Untrusted Data issue in the pebas CouponXxL software, which allows for Object Injection. This vulnerability is particularly severe due to its potential to enable remote code execution (RCE) and other high-impact attacks.

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 highlights the following characteristics:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This combination signifies that the vulnerability can be exploited remotely with low complexity, requiring no privileges or user interaction, and can result in high impacts on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can send crafted serialized data over the network to the vulnerable application.
• Web Application Inputs: Any input fields or upload mechanisms that accept serialized data can be exploited.

Exploitation Methods:

• Object Injection: By sending malicious serialized data, an attacker can inject objects that, when deserialized, execute arbitrary code or manipulate the application's state.
• Remote Code Execution (RCE): If the injected objects can trigger code execution, the attacker can gain control over the server.

3. Affected Systems and Software Versions

Affected Software:

• Product: CouponXxL
• Vendor: pebas
• Versions: From n/a through 3.0.0

All versions of CouponXxL up to and including 3.0.0 are affected by this vulnerability.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Upgrade to a patched version of CouponXxL as soon as it becomes available.
• Input Validation: Implement strict input validation and sanitization to prevent malicious serialized data from being processed.
• Deserialization Controls: Use secure deserialization libraries or frameworks that provide safeguards against object injection.

Long-term Mitigation:

• Code Review: Conduct a thorough code review to identify and remediate similar vulnerabilities.
• Security Training: Educate developers on secure coding practices, especially regarding deserialization.
• Regular Updates: Ensure that all software components are regularly updated and patched.

5. Impact on European Cybersecurity Landscape

The presence of such a critical vulnerability in a widely-used software like CouponXxL poses significant risks to European organizations. Given the potential for RCE, this vulnerability could be leveraged in large-scale attacks, leading to data breaches, financial losses, and disruptions in services.

Regulatory Implications:

• GDPR Compliance: Organizations must ensure that they comply with GDPR regulations, which mandate the protection of personal data.
• Incident Reporting: Any breach resulting from this vulnerability must be reported to relevant authorities within the stipulated timeframe.

6. Technical Details for Security Professionals

Deserialization Vulnerability:

• Root Cause: The vulnerability arises from the deserialization of untrusted data without proper validation or sanitization.
• Exploitation: An attacker can craft serialized data that, when deserialized, creates objects with malicious payloads.
• Detection: Monitor for unusual serialized data patterns in logs and network traffic. Implement intrusion detection systems (IDS) to identify suspicious deserialization activities.

Mitigation Techniques:

• Whitelisting: Use whitelisting to allow only specific classes to be deserialized.
• Serialization Libraries: Utilize libraries that support secure deserialization, such as SafeSerialization in Java.
• Network Segmentation: Implement network segmentation to limit the spread of potential attacks.

Example Code Snippet (PHP):

// Example of secure deserialization in PHP
$data = unserialize($input, ["allowed_classes" => [MyClass::class]]);

Conclusion: The deserialization vulnerability in CouponXxL is a critical issue that requires immediate attention. Organizations should prioritize patching and implementing robust security measures to mitigate the risk. Continuous monitoring and adherence to best practices in secure coding will be essential in preventing similar vulnerabilities in the future.

References:

• Patchstack Vulnerability Report
• CVE ID: CVE-2025-52725
• Assigner: Patchstack
• ENISA ID Product: 3001b1d3-1755-357c-b376-287734c6c4f3
• ENISA ID Vendor: cbd9a91e-3101-344e-a81c-ce1fab3c671e