EUVD-2023-3271

Comprehensive Technical Analysis of EUVD-2023-3271

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in XWiki Platform versions 2.3 through 14.10.15, 15.5.2, and 15.7-rc-1 allows users with edit permissions on any wiki page to gain programming rights. This is due to missing escaping in the code for displaying sections in the administration interface.

Severity Evaluation:

• Base Score: 10.0 (Critical)
• Base Score Version: CVSS 3.1
• Base Score 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 high scores for Confidentiality (C:H), Integrity (I:H), and Availability (A:H) reflect the potential for complete compromise of the XWiki installation. The attack vector (AV:N) is network-based, requiring low complexity (AC:L) and low privileges (PR:L) to exploit, with no user interaction (UI:N) needed. The scope (S:C) indicates that the vulnerability affects components beyond the initial compromised component.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Users: If the XWiki instance allows unauthenticated users to edit pages, they can exploit this vulnerability.
• Authenticated Users: Any authenticated user with edit permissions on their user profile can exploit this vulnerability.

Exploitation Methods:

• Code Injection: By injecting malicious code into editable sections of the wiki, an attacker can gain programming rights.
• Cross-Site Scripting (XSS): The missing escaping in the administration interface can be exploited to inject malicious scripts.

3. Affected Systems and Software Versions

Affected Versions:

• XWiki Platform 2.3 through 14.10.15
• XWiki Platform 15.0-rc-1 through 15.5.2
• XWiki Platform 15.6-rc-1 through 15.7-rc-1

Fixed Versions:

• XWiki Platform 14.10.15
• XWiki Platform 15.5.2
• XWiki Platform 15.7RC1

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Software: Upgrade to the patched versions (14.10.15, 15.5.2, or 15.7RC1) immediately.
• Apply Patches: Manually apply the patches to the XWiki.ConfigurableClassMacros and XWiki.ConfigurableClass pages if upgrading is not feasible.

Long-Term Strategies:

• Access Control: Restrict edit permissions to trusted users only.
• Regular Audits: Conduct regular security audits and code reviews to identify and fix similar vulnerabilities.
• Monitoring: Implement monitoring and logging to detect and respond to suspicious activities.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Widespread Use: XWiki Platform is widely used in various sectors, including education, government, and private enterprises.
• Data Breach Risk: The vulnerability can lead to data breaches, unauthorized access, and data manipulation, affecting the confidentiality, integrity, and availability of information.
• Compliance Issues: Organizations may face compliance issues with regulations such as GDPR if sensitive data is compromised.

Regulatory Implications:

• GDPR Compliance: Organizations must ensure that they comply with GDPR by implementing appropriate security measures and reporting data breaches within 72 hours.
• Cybersecurity Directives: Adherence to EU cybersecurity directives and guidelines is crucial to mitigate risks and ensure compliance.

6. Technical Details for Security Professionals

Vulnerability Details:

• Root Cause: Missing escaping in the code for displaying sections in the administration interface.
• Exploitability: The vulnerability can be exploited by injecting malicious code into editable sections of the wiki.

Patch Information:

• GitHub Commits:
  • Commit 0f367aaae4e0696f61cf5a67a75edd27d1d16db6
  • Commit 1157c1ecea395aac7f64cd8a6f484b1225416dc7
  • Commit 749f6aee1bfbcf191c3734ea0aa9eba3aa63240e
  • Commit bd82be936c21b65dee367d558e3050b9b6995713

References:

• GitHub Security Advisory
• NVD CVE-2023-50723
• [XWiki Jira Issues](https://jira.xwiki.org/browse/XWIKI-21121, https://jira.xwiki.org/browse/XWIKI-21122, https://jira.xwiki.org/browse/XWIKI-21194)

Conclusion: The vulnerability in XWiki Platform is critical and requires immediate attention. Organizations using affected versions should prioritize updating to the patched versions or applying the necessary patches. Regular security audits and strict access controls are essential to mitigate future risks. Compliance with EU cybersecurity regulations and directives is crucial to ensure the protection of sensitive data and maintain trust in digital services.