EUVD-2023-2705

Comprehensive Technical Analysis of EUVD-2023-2705

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The XWiki Platform, a generic wiki platform, is vulnerable to cross-site scripting (XSS) due to insufficient escaping of error messages when attempting to create a document that already exists. This vulnerability affects specific versions of org.xwiki.platform:xwiki-platform-web and org.xwiki.platform:xwiki-platform-web-templates.

Severity Evaluation:

• Base Score: 9.1
• Base Score Version: CVSS:3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

The CVSS score of 9.1 indicates a critical vulnerability. The high severity is due to the potential for high impact on confidentiality, integrity, and availability, combined with the low complexity of the attack and the requirement for user interaction.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Document Creation Exploit: An attacker can create a document with a name containing malicious code. When another user attempts to create a document with the same name, the error message will include the malicious code, leading to XSS.
2. Error Message Injection: The lack of proper escaping in the error message allows for raw HTML injection, which can be exploited to execute arbitrary JavaScript code.

Exploitation Methods:

• Step 1: The attacker creates a document with a name that includes a malicious script.
• Step 2: Another user attempts to create a document with the same name.
• Step 3: The error message displayed to the user includes the malicious script, which is executed in the user's browser context.

3. Affected Systems and Software Versions

Affected Versions:

• org.xwiki.platform:xwiki-platform-web versions from 3.1-milestone-2 to 13.4-rc-1.
• org.xwiki.platform:xwiki-platform-web-templates versions prior to 14.10.12 and 15.5-rc-1.

Patched Versions:

• org.xwiki.platform:xwiki-platform-web version 13.4-rc-1.
• org.xwiki.platform:xwiki-platform-web-templates versions 14.10.12 and 15.5-rc-1.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to the patched versions of org.xwiki.platform:xwiki-platform-web and org.xwiki.platform:xwiki-platform-web-templates.
• Manual Patch: Apply the fix manually by modifying the createinline.vm template file in the XWiki WAR.

Long-Term Mitigation:

• Regular Updates: Ensure that all software components are regularly updated to the latest versions.
• Input Validation: Implement robust input validation and escaping mechanisms to prevent XSS vulnerabilities.
• Security Audits: Conduct regular security audits and code reviews to identify and mitigate potential vulnerabilities.

5. Impact on European Cybersecurity Landscape

Impact Assessment:

• Wide Usage: XWiki Platform is widely used in various organizations, including those in the European Union. This vulnerability poses a significant risk to the confidentiality, integrity, and availability of data.
• Compliance: Organizations must ensure compliance with GDPR and other relevant regulations by promptly addressing this vulnerability to protect user data.
• Reputation: Failure to mitigate this vulnerability can lead to data breaches, financial losses, and reputational damage for affected organizations.

6. Technical Details for Security Professionals

Technical Overview:

• Vulnerable Component: The createinline.vm template file in the XWiki WAR.
• Fix Details: The patch involves adding appropriate escaping to the error message to prevent raw HTML injection.

References:

• GitHub Advisory: GHSA-93gh-jgjj-r929
• NVD Entry: CVE-2023-45137
• GitHub Commit: ed8ec747967f8a16434806e727a57214a8843581
• Jira Issue: XWIKI-20961

Conclusion: This vulnerability highlights the importance of proper input validation and escaping mechanisms in web applications. Organizations using the XWiki Platform should prioritize updating to the patched versions to mitigate the risk of XSS attacks. Regular security audits and adherence to best practices in software development are crucial for maintaining a robust cybersecurity posture.