EUVD-2024-1076

Comprehensive Technical Analysis of EUVD-2024-1076

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-1076 affects the XWiki Platform, a generic wiki platform, and allows for arbitrary code execution on the server. The vulnerability is present in versions starting from 3.1 up to 15.5.4 and 15.10-rc-1. The severity of this vulnerability is rated with a CVSS Base Score of 9.1, which is considered critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H indicates the following:

• 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): Low (L) - The attacker needs low-level privileges.
• User Interaction (UI): Required (R) - User interaction is required for the attack to succeed.
• Scope (S): Changed (C) - The vulnerability affects a different security scope.
• Confidentiality (C): High (H) - There is a high impact on confidentiality.
• Integrity (I): High (H) - There is a high impact on integrity.
• Availability (A): High (H) - There is a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves creating a document with a specially crafted document reference and an XWiki.SchedulerJobClass XObject. The exploitation occurs when an admin visits the scheduler page or when the scheduler page is referenced, such as through an image in a comment on a wiki page. This can lead to arbitrary code execution on the server.

Potential exploitation methods include:

• Social Engineering: Tricking an admin into visiting the scheduler page.
• Automated Scripts: Using automated scripts to inject the malicious document reference and XObject.
• Phishing: Sending phishing emails to admins with links to the scheduler page.

3. Affected Systems and Software Versions

The affected versions of the XWiki Platform are:

• Versions starting from 3.1 up to 4.10.19
• Versions 15.5.4 and prior
• Versions 15.10-rc-1 and prior

The vulnerability has been fixed in the following versions:

• XWiki 14.10.19
• XWiki 15.5.5
• XWiki 15.9

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following strategies are recommended:

• Upgrade: Upgrade to the patched versions of XWiki Platform (14.10.19, 15.5.5, or 15.9).
• Manual Patch: Apply the patch manually by modifying the Scheduler.WebHome page as a temporary workaround.
• Access Control: Restrict access to the scheduler page to trusted admins only.
• Monitoring: Implement monitoring and logging to detect any suspicious activities related to the scheduler page.
• User Education: Educate users and admins about the risks of visiting untrusted links and the importance of verifying the authenticity of emails and links.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of wiki platforms in various organizations, including government agencies, educational institutions, and private enterprises. The potential for arbitrary code execution can lead to data breaches, unauthorized access, and disruption of services, affecting the confidentiality, integrity, and availability of information.

6. Technical Details for Security Professionals

For security professionals, the following technical details are crucial:

• Vulnerability Type: Arbitrary Code Execution
• Affected Component: XWiki.SchedulerJobClass XObject and document references
• Exploitation Trigger: Admin visiting the scheduler page or the scheduler page being referenced
• Patch Details: The patch involves modifying the Scheduler.WebHome page to prevent the execution of malicious code.
• References:
  • GitHub Security Advisory
  • NVD Detail
  • GitHub Commits
  • GitHub Commits
  • GitHub Commits
  • Jira Issue

By understanding these details, security professionals can better assess the risk, implement appropriate mitigations, and ensure the security of their XWiki Platform deployments.