EUVD-2025-4562

Comprehensive Technical Analysis of EUVD-2025-4562

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in the XWiki Platform allows any guest user to perform arbitrary remote code execution (RCE) through a specially crafted request to the SolrSearch endpoint. This vulnerability significantly impacts the confidentiality, integrity, and availability of the XWiki installation.

Severity Evaluation:

• Base Score: 9.8
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high base score of 9.8 indicates a critical vulnerability. The CVSS vector breakdown shows that the vulnerability can be exploited over the network (AV:N), requires low complexity (AC:L), does not require any privileges (PR:N) or user interaction (UI:N), and has a high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated RCE: An attacker can send a crafted HTTP request to the SolrSearch endpoint without needing to authenticate.
• Injection Points: The vulnerability leverages the SolrSearch functionality, which processes user input in a way that allows for code injection.

Exploitation Methods:

• Crafted URL: An attacker can exploit the vulnerability by sending a request to <host>/xwiki/bin/get/Main/SolrSearch?media=rss&text=%7D%7D%7D%7B%7Basync%20async%3Dfalse%7D%7D%7B%7Bgroovy%7D%7Dprintln%28"Hello%20from"%20%2B%20"%20search%20text%3A"%20%2B%20%2823%20%2B%2019%29%29%7B%7B%2Fgroovy%7D%7D%7B%7B%2Fasync%7D%7D%20.
• Payload Execution: The payload executes arbitrary Groovy code, which can be used to perform various malicious actions such as data exfiltration, system compromise, or further exploitation.

3. Affected Systems and Software Versions

Affected Versions:

• XWiki Platform versions prior to 15.10.11
• XWiki Platform versions 16.0.0-rc-1 to 16.4.1

Unaffected Versions:

• XWiki Platform 15.10.11 and later
• XWiki Platform 16.4.1 and later
• XWiki Platform 16.5.0RC1 and later

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Users are strongly advised to upgrade to the patched versions (15.10.11, 16.4.1, or 16.5.0RC1).
• Temporary Fix: For users unable to upgrade immediately, edit Main.SolrSearchMacros in SolrSearchMacros.xml on line 955 to match the rawResponse macro in macros.vm#L2824 with a content type of application/xml.

Long-Term Mitigation:

• Regular Patching: Implement a regular patching and update schedule for all software components.
• Input Validation: Ensure robust input validation and sanitization mechanisms are in place to prevent similar injection vulnerabilities.
• Access Controls: Implement strict access controls and authentication mechanisms to limit unauthorized access.

5. Impact on European Cybersecurity Landscape

Regional Impact:

• Widespread Use: XWiki Platform is widely used in various sectors across Europe, including education, government, and private enterprises.
• Critical Infrastructure: The vulnerability poses a significant risk to critical infrastructure and sensitive data, potentially leading to data breaches, service disruptions, and financial losses.
• Compliance: Organizations must ensure compliance with European cybersecurity regulations and standards, such as GDPR and NIS Directive, to mitigate legal and financial repercussions.

6. Technical Details for Security Professionals

Exploit Reproduction: To reproduce the vulnerability, perform the following steps:

1. Access the XWiki instance without logging in.
2. Send a GET request to <host>/xwiki/bin/get/Main/SolrSearch?media=rss&text=%7D%7D%7D%7B%7Basync%20async%3Dfalse%7D%7D%7B%7Bgroovy%7D%7Dprintln%28"Hello%20from"%20%2B%20"%20search%20text%3A"%20%2B%20%2823%20%2B%2019%29%29%7B%7B%2Fgroovy%7D%7D%7B%7B%2Fasync%7D%7D%20.
3. Check the output and the title of the RSS feed for the string Hello from search text:42.

Patch Details:

• Patch Commit: The vulnerability was patched in commit 67021db9b8ed26c2236a653269302a86bf01ef40.
• Code Changes: The patch involves modifying the SolrSearchMacros.xml file to ensure that the rawResponse macro handles the content type correctly, preventing arbitrary code execution.

References:

• GitHub Advisory
• NVD Entry
• XWiki Jira Issue

Conclusion: The EUVD-2025-4562 vulnerability in the XWiki Platform is critical and requires immediate attention. Organizations should prioritize upgrading to the patched versions or applying the temporary fix to mitigate the risk of exploitation. Regular security audits and adherence to best practices will help maintain a robust cybersecurity posture.