EUVD-2024-1213

Comprehensive Technical Analysis of EUVD-2024-1213

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2024-1213 affects the XWiki Platform, a generic wiki platform, and is related to improper HTML escaping in the escaping tool used by XWiki. This flaw allows for XWiki syntax injection, which can lead to remote code execution (RCE). The vulnerability is present in versions starting from 3.0.1 up to but not including versions 4.10.19, 15.5.4, and 15.10-rc-1.

Severity Evaluation:

• CVSS Base Score: 10.0
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

The CVSS score of 10.0 indicates a critical vulnerability. The 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:

• Remote Code Execution (RCE): An attacker can inject malicious XWiki syntax by exploiting the improper escaping of the { character. This can lead to arbitrary code execution on the server.
• XWiki Syntax Injection: The vulnerability allows attackers to inject XWiki syntax, which can be used to manipulate the content and behavior of the wiki platform.

Exploitation Methods:

• Crafted Input: An attacker can craft input that includes the { character in a way that bypasses the HTML escaping mechanism.
• Document Manipulation: By manipulating documents such as Panels.PanelLayoutUpdate, an attacker can inject malicious syntax that executes arbitrary code.

3. Affected Systems and Software Versions

Affected Versions:

• XWiki Platform versions 3.0.1 to 4.10.19 (excluding 4.10.19)
• XWiki Platform versions 15.5.4 (excluding 15.5.4)
• XWiki Platform versions 15.10-rc-1 (excluding 15.10-rc-1)

Fixed Versions:

• XWiki 14.10.19
• XWiki 15.5.5
• XWiki 15.9 RC1

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to the patched versions of XWiki (14.10.19, 15.5.5, or 15.9 RC1).
• Document Patching: Replace $escapetool.html with $escapetool.xml in XWiki documents, particularly in Panels.PanelLayoutUpdate.

Long-Term Mitigation:

• Regular Updates: Ensure that all XWiki installations are regularly updated to the latest versions.
• Code Review: Conduct thorough code reviews to identify and fix similar escaping issues.
• Security Audits: Perform regular security audits to detect and mitigate potential vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using XWiki Platform within the European Union. Given the critical nature of the vulnerability (CVSS score of 10.0), it can be exploited to compromise the integrity, confidentiality, and availability of wiki platforms, leading to data breaches, unauthorized access, and service disruptions. This underscores the importance of timely patching and proactive security measures to protect against such threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• Root Cause: The HTML escaping tool in XWiki does not properly escape the { character, allowing for syntax injection.
• Exploitation: The injection can be used to execute arbitrary code on the server, leading to RCE.
• Affected Document: The document Panels.PanelLayoutUpdate is known to expose this vulnerability.

Mitigation Steps:

1. Upgrade XWiki: Ensure that all XWiki installations are upgraded to versions 14.10.19, 15.5.5, or 15.9 RC1.
2. Document Patching: Replace $escapetool.html with $escapetool.xml in all XWiki documents, especially in Panels.PanelLayoutUpdate.
3. Extension Review: Review all extensions for similar vulnerabilities and apply necessary patches.

References:

• GitHub Advisory
• NVD Detail
• XWiki Commons GitHub
• XWiki Jira
• XWiki Jira

By following these recommendations and staying vigilant, organizations can mitigate the risks associated with this critical vulnerability and enhance their overall cybersecurity posture.