EUVD-2024-1189

Comprehensive Technical Analysis of EUVD-2024-1189

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2024-1189 affects the XWiki Platform, a generic wiki platform, and allows for remote code execution (RCE). The vulnerability is present in versions starting from 6.4-milestone-1 up to but not including versions 14.10.19, 15.5.4, and 15.10-rc-1. The severity of this vulnerability is rated with a CVSS base score of 10.0, which is the highest possible score, indicating a critical risk.

CVSS Vector Breakdown:

• 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, such as the ability to edit a page.
• UI:N (No User Interaction): No user interaction is required for the attack to succeed.
• S:C (Changed Scope): The vulnerability affects a different security scope.
• C:H (High Confidentiality Impact): Complete loss of confidentiality.
• I:H (High Integrity Impact): Complete loss of integrity.
• A:H (High Availability Impact): Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves any user with edit permissions, such as the ability to edit their profile, creating a custom skin with a template override. This template override can be executed with programming rights, leading to RCE. The attack does not require any user interaction, making it particularly dangerous.

Exploitation Methods:

• Template Injection: An attacker can inject malicious code into a custom skin template.
• Privilege Escalation: By exploiting the RCE vulnerability, an attacker can escalate their privileges and gain full control over the XWiki instance.

3. Affected Systems and Software Versions

The vulnerability affects the following versions of the XWiki Platform:

• From version 6.4-milestone-1 to versions prior to 14.10.19.
• From version 15.0-rc-1 to versions prior to 15.5.4.
• From version 15.6-rc-1 to versions prior to 15.10-rc-1.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: The most effective mitigation is to upgrade to the patched versions: 14.10.19, 15.5.4, or 15.10-rc-1.

Temporary Mitigation:

• Restrict Edit Permissions: Temporarily restrict edit permissions to trusted users only.
• Monitoring: Implement enhanced monitoring for suspicious activities, especially around template modifications.

Long-Term Mitigation:

• Regular Updates: Ensure that the XWiki Platform is regularly updated to the latest stable versions.
• Access Control: Implement strict access control policies to limit the number of users with edit permissions.

5. Impact on European Cybersecurity Landscape

Given the critical nature of the vulnerability and its potential for RCE, organizations using the affected versions of XWiki Platform are at significant risk. This vulnerability could be exploited to compromise sensitive data, disrupt services, and potentially lead to further attacks within the network. The European cybersecurity landscape could see an increase in targeted attacks against organizations using XWiki, especially if the vulnerability is not promptly addressed.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2024-31987
• GHSA ID: GHSA-cv55-v6rw-7r5v
• Affected Component: Custom skin template override functionality.
• Exploitability: High, due to low complexity and no user interaction required.

Detection and Response:

• Log Analysis: Review logs for any unusual template modifications or code execution attempts.
• Intrusion Detection Systems (IDS): Implement IDS rules to detect and alert on suspicious activities related to template modifications.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• GitHub Security Advisory
• NVD Detail
• XWiki Jira Issue

Conclusion: The vulnerability in the XWiki Platform is critical and requires immediate attention. Organizations should prioritize upgrading to the patched versions and implement strict access controls to mitigate the risk. Continuous monitoring and a robust incident response plan are essential to protect against potential exploitation.