EUVD-2023-2811

Comprehensive Technical Analysis of EUVD-2023-2811

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2023-2811 affects the XWiki Platform, a generic wiki platform that provides runtime services for applications. The issue allows any user with the ability to edit their own user profile to execute arbitrary script macros, including Groovy and Python macros. This can lead to remote code execution (RCE) and unrestricted read and write access to all wiki contents.

Severity Evaluation:

• CVSS Base Score: 10.0 (Critical)
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

The CVSS score of 10.0 indicates a critical vulnerability. The vector breakdown shows that the attack can be executed over the network (AV:N), requires low complexity (AC:L), and needs low privileges (PR:L). The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H), and the scope is changed (S:C), meaning the vulnerability can affect components beyond the initial security scope.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• User Profile Editing: An attacker with the ability to edit their user profile can inject malicious script macros.
• Script Macros: The vulnerability allows the execution of Groovy and Python macros, which can be used to perform RCE.

Exploitation Methods:

• Script Injection: An attacker can inject malicious scripts into their user profile, which will be executed by the XWiki Platform.
• Remote Code Execution: The injected scripts can be used to execute arbitrary code on the server, leading to full control over the wiki contents and potentially the underlying server.

3. Affected Systems and Software Versions

Affected Versions:

• XWiki Platform versions starting from 5.1-rc-1 up to but not including 14.10.8.
• XWiki Platform versions starting from 15.0-rc-1 up to but not including 15.3-rc-1.

Patched Versions:

• XWiki Platform 14.10.8
• XWiki Platform 15.3-rc-1

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to the patched versions (14.10.8 or 15.3-rc-1) as soon as possible.
• Manual Patch: If upgrading is not feasible, manually apply the patch to the document Menu.UIExtensionSheet by changing the three lines as specified in the advisory.

Long-Term Mitigation:

• Access Control: Restrict user profile editing permissions to trusted users only.
• Monitoring: Implement monitoring and logging to detect and respond to any suspicious activities related to user profile edits.
• Regular Updates: Ensure that the XWiki Platform and all related components are regularly updated to the latest versions.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using the XWiki Platform, particularly those in the European Union. The ability to execute arbitrary code and gain unrestricted access to wiki contents can lead to data breaches, unauthorized modifications, and potential loss of sensitive information. Given the critical nature of the vulnerability, it is essential for organizations to prioritize patching and mitigation efforts to protect their systems and data.

6. Technical Details for Security Professionals

Vulnerability Details:

• Cause: Insufficient escaping of script macros in user profiles.
• Impact: Remote code execution and unrestricted access to wiki contents.

Patch Information:

• Patch Location: Document Menu.UIExtensionSheet
• Patch Details: Three lines need to be changed to add proper escaping.

References:

• GitHub Advisory: GHSA-v2rr-xw95-wcjx
• NVD Entry: CVE-2023-37909
• GitHub Commit: 9e8f080094333dec63a8583229a3799208d773be
• Jira Issue: XWIKI-20746

Additional Information:

• EPSS Score: 37 (indicating a moderate likelihood of exploitation)
• ENISA IDs:
  • Product: xwiki-platform (versions 15.0-rc-1, < 15.3-rc-1 and 5.1-rc-1, < 14.10.8)
  • Vendor: xwiki

In conclusion, the vulnerability in the XWiki Platform is critical and requires immediate attention. Organizations should prioritize upgrading to the patched versions or applying the manual patch to mitigate the risk of remote code execution and unauthorized access. Regular monitoring and access control measures should also be implemented to enhance overall security.