EUVD-2023-2744

Comprehensive Technical Analysis of EUVD-2023-2744

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2023-2744 affects the com.xwiki.identity-oauth:identity-oauth-ui package, which is used for building identity and service providers based on OAuth authorizations. The issue involves a cross-site scripting (XSS) vulnerability and XWiki syntax injection, which can lead to remote code execution (RCE) via the Groovy macro. This vulnerability is rated with a CVSS base score of 10.0, indicating a critical severity level.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Complexity): The attack requires low skill or resources.
• PR:N (No Privileges Required): No privileges are needed to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the exploit to succeed.
• S:C (Changed Scope): The vulnerability affects a different security scope.
• C:H (High Confidentiality Impact): Complete loss of confidentiality.
• I:H (High Integrity Impact): Complete loss of integrity.
• A:H (High Availability Impact): Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Cross-Site Scripting (XSS): An attacker can inject malicious scripts into web pages viewed by other users. This can be used to steal session cookies, perform actions on behalf of the user, or redirect the user to malicious sites.
• XWiki Syntax Injection: An attacker can inject malicious XWiki syntax, which can be used to execute arbitrary code on the server.
• Remote Code Execution (RCE): By exploiting the Groovy macro, an attacker can execute arbitrary code on the server, leading to full control over the XWiki installation.

Exploitation Methods:

• GET Request Manipulation: An attacker can manipulate the identityOAuth parameters in the GET request to inject malicious scripts or XWiki syntax.
• Groovy Macro Exploitation: Once the attacker has injected the malicious code, they can use the Groovy macro to execute arbitrary commands on the server.

3. Affected Systems and Software Versions

The vulnerability affects versions of the identity-oauth package from 1.0 to 1.5. The issue has been fixed in version 1.6. Organizations using any of the affected versions are at risk and should upgrade immediately.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade: Upgrade to identity-oauth version 1.6 or later.
• Patch Management: Ensure that all software dependencies are up to date and patched against known vulnerabilities.

Long-Term Strategies:

• Input Validation: Implement robust input validation and sanitization to prevent XSS and injection attacks.
• Security Audits: Conduct regular security audits and code reviews to identify and mitigate potential vulnerabilities.
• Monitoring: Implement monitoring and logging to detect and respond to suspicious activities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using the affected XWiki software, particularly those in the European Union. The potential for remote code execution can lead to data breaches, loss of sensitive information, and disruption of services. Given the critical nature of the vulnerability, it is essential for organizations to prioritize patching and mitigation efforts to protect their systems and data.

6. Technical Details for Security Professionals

Vulnerability Details:

• Affected Component: com.xwiki.identity-oauth:identity-oauth-ui
• Vulnerable Parameters: identityOAuth parameters in GET requests
• Exploit Mechanism: Injection of malicious scripts or XWiki syntax leading to RCE via Groovy macro

References:

• GitHub Advisory: GHSA-h2rm-29ch-wfmh
• NVD Entry: CVE-2023-45144
• GitHub Commits: Commit d805d3154b17c6bf455ddf5deb0a3461a3833bc6
• Jira Issue: XWIKI-20719

Additional Resources:

• XWiki GitHub Repository: identity-oauth
• Vulnerable Code: LoginUIExtension.vm

By understanding the technical details and implementing the recommended mitigation strategies, organizations can effectively protect their systems from this critical vulnerability.