EUVD-2024-2140

Comprehensive Technical Analysis of EUVD-2024-2140

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in the XWiki Platform allows the content of a document included using the {{include reference="targetdocument"/}} macro to be executed with the rights of the includer rather than the author. This means that any user with the ability to modify the target document can impersonate the author of the content that used the include macro.

Severity Evaluation: The vulnerability has a CVSS Base Score of 10.0, which is the highest possible score, indicating a critical severity. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H breaks down as follows:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Complexity): The attack requires low skill or resources.
• PR:L (Low Privileges Required): The attacker needs low-level privileges.
• UI:N (No User Interaction): No user interaction is required for the attack to succeed.
• S:C (Changed Scope): The vulnerability affects components beyond the security scope.
• C:H (High Confidentiality Impact): The vulnerability allows unauthorized access to sensitive data.
• I:H (High Integrity Impact): The vulnerability allows unauthorized modification of data.
• A:H (High Availability Impact): The vulnerability can lead to significant disruption of services.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Impersonation Attacks: An attacker can modify the target document to execute malicious code with the rights of the includer, effectively impersonating the author.
• Privilege Escalation: By exploiting this vulnerability, an attacker can gain higher privileges within the XWiki Platform, leading to unauthorized actions.
• Data Manipulation: The attacker can manipulate the content of the included document to inject malicious scripts or commands.

Exploitation Methods:

• Code Injection: Injecting malicious code into the target document that will be executed with the includer's rights.
• Phishing: Creating a phishing page within the XWiki Platform to trick users into revealing sensitive information.
• Data Exfiltration: Extracting sensitive data by modifying the target document to include scripts that send data to an external server.

3. Affected Systems and Software Versions

Affected Versions:

• XWiki Platform versions from 1.5-milestone-2 to 15.0-rc-1.

Unaffected Versions:

• XWiki Platform 15.0 RC1 and later, where the default behavior has been made safe.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade: Upgrade to XWiki Platform 15.0 RC1 or later to mitigate the vulnerability.
• Access Control: Implement strict access controls to limit who can modify documents, especially those that are frequently included.
• Monitoring: Increase monitoring of document modifications and user activities within the XWiki Platform.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits to identify and mitigate similar vulnerabilities.
• User Training: Educate users on the risks associated with document inclusion and the importance of verifying document sources.
• Patch Management: Establish a robust patch management process to ensure timely updates and patches are applied.

5. Impact on European Cybersecurity Landscape

Regulatory Compliance:

• Organizations using XWiki Platform must ensure compliance with GDPR and other relevant regulations by addressing this vulnerability promptly.
• Failure to mitigate this vulnerability could result in data breaches, leading to regulatory fines and legal actions.

Cybersecurity Posture:

• The vulnerability underscores the importance of regular updates and patches in maintaining a strong cybersecurity posture.
• European organizations should prioritize cybersecurity awareness and training to mitigate similar risks in the future.

6. Technical Details for Security Professionals

Technical Overview:

• The vulnerability arises from the mismanagement of execution rights when including documents using the {{include reference="targetdocument"/}} macro.
• The default behavior in versions prior to 15.0 RC1 allows the included content to execute with the includer's rights, leading to potential impersonation and privilege escalation.

Detection and Response:

• Detection: Implement logging and monitoring to detect unusual modifications to documents and unauthorized access attempts.
• Response: Develop an incident response plan that includes steps for identifying affected documents, isolating compromised accounts, and applying patches.

References:

• GitHub Advisory
• NVD Entry
• XWiki Jira

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and maintain a strong cybersecurity posture.