Description
Deserialization of Untrusted Data vulnerability in Drupal Core allows Object Injection.This issue affects Drupal Core: from 8.0.0 before 10.2.11, from 10.3.0 before 10.3.9, from 11.0.0 before 11.0.8. Drupal core contains a chain of methods that is exploitable when an insecure deserialization vulnerability exists on the site. This so-called gadget chain presents no direct threat but is a vector that can be used to achieve remote code execution if the application deserializes untrusted data due to another vulnerability.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2024-3516
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2024-3516 pertains to a deserialization of untrusted data issue in Drupal Core, which can lead to object injection. This vulnerability is particularly severe because it can be exploited to achieve remote code execution (RCE) if the application deserializes untrusted data due to another vulnerability. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The scoring vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights the following characteristics:
- Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
- Attack Complexity (AC): Low (L) - The attack requires minimal complexity.
- Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
- User Interaction (UI): None (N) - No user interaction is required.
- Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
- Confidentiality (C): High (H) - The vulnerability has a high impact on confidentiality.
- Integrity (I): High (H) - The vulnerability has a high impact on integrity.
- Availability (A): High (H) - The vulnerability has a high impact on availability.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector involves exploiting the deserialization of untrusted data. An attacker could craft malicious input that, when deserialized, leads to object injection. This injection can then be used to execute arbitrary code on the server. The exploitation method typically involves:
- Identifying a vulnerable endpoint: The attacker needs to find an endpoint in the Drupal application that accepts serialized data.
- Crafting malicious input: The attacker creates a serialized object that, when deserialized, triggers the object injection.
- Executing arbitrary code: The injected object can be used to execute arbitrary code, leading to RCE.
3. Affected Systems and Software Versions
The vulnerability affects the following versions of Drupal Core:
- Drupal Core 8.0.0 before 10.2.11
- Drupal Core 10.3.0 before 10.3.9
- Drupal Core 11.0.0 before 11.0.8
Organizations using these versions are at risk and should prioritize updating to the patched versions.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Update to the Latest Version: Immediately update Drupal Core to the latest patched versions (10.2.11, 10.3.9, or 11.0.8 and above).
- Input Validation: Implement strict input validation to ensure that only trusted data is deserialized.
- Disable Unnecessary Features: Disable any features or modules that are not in use to reduce the attack surface.
- Monitor and Log: Enable comprehensive logging and monitoring to detect any suspicious activities.
- Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential risks.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations that rely on Drupal for their web applications. Given the widespread use of Drupal in various sectors, including government, education, and business, the potential impact is substantial. Successful exploitation could lead to data breaches, unauthorized access, and service disruptions, affecting the confidentiality, integrity, and availability of critical systems.
6. Technical Details for Security Professionals
For security professionals, the following technical details are crucial:
- Gadget Chain: The vulnerability involves a chain of methods (gadget chain) that can be exploited when an insecure deserialization vulnerability exists. This chain does not present a direct threat but can be used as a vector for RCE.
- Deserialization Mechanism: Understanding the deserialization mechanism in Drupal Core is essential. Security professionals should review the codebase to identify all instances where deserialization occurs and ensure that only trusted data is processed.
- Patch Analysis: Review the patch commit (
1664030d399c73b4144f410f2ccc68c66a947f8d) to understand the changes made to mitigate the vulnerability. This can provide insights into the specific methods and classes that were affected. - Security Best Practices: Implement security best practices such as using secure coding guidelines, conducting code reviews, and employing automated security testing tools to identify and mitigate similar vulnerabilities in the future.
Conclusion
EUVD-2024-3516 represents a critical vulnerability in Drupal Core that requires immediate attention. Organizations should prioritize updating to the patched versions and implement robust security measures to mitigate the risk of exploitation. The potential impact on the European cybersecurity landscape underscores the importance of proactive security management and continuous monitoring.