EUVD-2025-205451

Comprehensive Technical Analysis of EUVD-2025-205451

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-205451 is a prototype pollution vulnerability in the apidoc-core library. This type of vulnerability allows remote attackers to modify JavaScript object prototypes, which can lead to denial of service (DoS) or unintended behavior in applications relying on the integrity of prototype chains. The severity of this vulnerability is rated with a Base Score of 9.3 using CVSS version 4.0, indicating a critical risk.

CVSS Vector Breakdown:

• AV:N (Attack Vector: Network) - The vulnerability can be exploited remotely over the network.
• AC:L (Attack Complexity: Low) - The attack requires minimal skill and resources.
• AT:N (Attack Technique: Network) - The attack can be executed over the network.
• PR:N (Privileges Required: None) - No special privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None) - No user interaction is required for the attack to succeed.
• VC:H (Vulnerability Consequence: High) - The impact on confidentiality is high.
• VI:H (Vulnerability Impact: High) - The impact on integrity is high.
• VA:H (Vulnerability Availability: High) - The impact on availability is high.
• SC:N (Scope Change: None) - The scope of the vulnerability does not change.
• SI:N (Scope Impact: None) - The impact on the scope is none.
• SA:N (Scope Availability: None) - The availability impact on the scope is none.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is through malformed data structures sent to the application. Specifically, the define property processed by the preProcess() function in various worker modules (api_group.js, api_param_title.js, api_use.js, and api_permission.js) is susceptible to prototype pollution.

Exploitation Methods:

• Remote Code Execution (RCE): By manipulating the prototype chain, an attacker could potentially execute arbitrary code within the application context.
• Denial of Service (DoS): Modifying the prototype chain can cause the application to crash or become unresponsive.
• Data Manipulation: Attackers can alter the behavior of the application by injecting malicious properties into the prototype chain, leading to unintended actions or data corruption.

3. Affected Systems and Software Versions

The vulnerability affects all versions of apidoc-core starting from version 0.2.0. This includes:

• apidoc-core version 0.2.0
• All subsequent versions of apidoc-core

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Upgrade to a patched version of apidoc-core as soon as it becomes available.
• Input Validation: Implement strict input validation to ensure that malformed data structures are rejected before they reach the vulnerable functions.
• Sanitization: Sanitize all user inputs to prevent prototype pollution.
• Monitoring: Increase monitoring and logging to detect any unusual behavior or attempts to exploit the vulnerability.

Long-Term Strategies:

• Code Review: Conduct a thorough code review of the preProcess() function and related modules to identify and fix similar vulnerabilities.
• Security Training: Provide security training for developers to understand and mitigate prototype pollution vulnerabilities.
• Regular Updates: Ensure that all dependencies and libraries are regularly updated to the latest versions.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of apidoc-core in various applications. Organizations relying on this library for API documentation and related functionalities are at risk of being compromised. The high severity score indicates that successful exploitation could lead to severe consequences, including data breaches, service disruptions, and potential legal and financial repercussions under GDPR and other regulations.

6. Technical Details for Security Professionals

Vulnerable Functions:

• preProcess() in api_group.js
• preProcess() in api_param_title.js
• preProcess() in api_use.js
• preProcess() in api_permission.js

Exploitation Steps:

1. Identify Target: Identify applications using vulnerable versions of apidoc-core.
2. Craft Malicious Input: Create a malformed data structure that targets the define property.
3. Send Payload: Send the crafted payload to the application, aiming to modify the prototype chain.
4. Observe Impact: Monitor the application for signs of DoS, RCE, or data manipulation.

Detection and Response:

• Log Analysis: Analyze logs for unusual patterns or errors related to prototype pollution.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious activities.
• Incident Response Plan: Have a robust incident response plan in place to quickly address any detected exploitation attempts.

References:

• Sonatype Security Advisory
• NVD Detail
• apidoc-core GitHub Repository

By addressing this vulnerability promptly and comprehensively, organizations can mitigate the risk of exploitation and ensure the security and integrity of their applications.