EUVD-2023-3137

Comprehensive Technical Analysis of EUVD-2023-3137

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in XWiki Platform, identified as EUVD-2023-3137 (CVE-2023-50721, GHSA-7654-vfh6-rw6x), allows for the injection of XWiki syntax containing script macros, including Groovy macros, due to improper escaping of the id and label of search user interface extensions. This can lead to remote code execution (RCE), impacting the confidentiality, integrity, and availability of the entire XWiki instance.

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 high base score indicates a critical vulnerability that can be exploited remotely with low complexity, requiring only low privileges, and resulting in high impact on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Code Execution (RCE): An attacker can inject malicious XWiki syntax containing script macros, including Groovy macros, into the search administration interface.
• Privilege Escalation: Any user with the ability to edit a wiki page, such as their profile page, can exploit this vulnerability.

Exploitation Methods:

• Injection of Malicious Code: By embedding malicious Groovy macros within the search user interface extensions, an attacker can execute arbitrary code on the server.
• Persistent Attack: The injected code can be persistently stored in the wiki pages, allowing for repeated exploitation.

3. Affected Systems and Software Versions

Affected Versions:

• XWiki Platform 4.5-rc-1 to 14.10.15
• XWiki Platform 15.6-rc-1 to 15.7-rc-1
• XWiki Platform 15.0-rc-1 to 15.5.2

Fixed Versions:

• XWiki Platform 14.10.15
• XWiki Platform 15.5.2
• XWiki Platform 15.7-rc-1

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Apply Patch: Manually apply the patch to the page XWiki.SearchAdmin as a temporary workaround.
• Upgrade: Upgrade to the fixed versions (14.10.15, 15.5.2, or 15.7-rc-1) as soon as possible.

Long-Term Mitigation:

• Regular Updates: Ensure that the XWiki Platform is regularly updated to the latest stable version.
• Access Control: Restrict editing permissions to trusted users only.
• Monitoring: Implement monitoring and logging to detect any suspicious activities or unauthorized code execution.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Wide Adoption: XWiki Platform is widely used in various organizations, including those in the European Union, for collaborative documentation and knowledge management.
• Critical Infrastructure: The vulnerability can affect critical infrastructure if XWiki is used in such environments, leading to potential data breaches, service disruptions, and loss of integrity.
• Compliance: Organizations must ensure compliance with GDPR and other relevant regulations by addressing this vulnerability promptly to protect user data.

6. Technical Details for Security Professionals

Technical Overview:

• Vulnerable Component: The search administration interface in XWiki Platform.
• Root Cause: Improper escaping of the id and label of search user interface extensions.
• Exploitation: Injection of XWiki syntax containing script macros, including Groovy macros, leading to RCE.

Detection and Response:

• Detection: Implement intrusion detection systems (IDS) to monitor for unusual activities related to the search administration interface.
• Response: Develop an incident response plan that includes steps for identifying, containing, and remediating the vulnerability.

References:

• GitHub Advisory
• NVD Entry
• GitHub Commit
• XWiki Jira

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk of exploitation and ensure the integrity and security of their XWiki instances.