CVE-2023-50721

Comprehensive Technical Analysis of CVE-2023-50721

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2023-50721 CVSS Score: 9.9

The vulnerability in XWiki Platform allows for remote code execution (RCE) due to improper escaping of the id and label of search user interface extensions. This flaw enables the injection of XWiki syntax containing script macros, including Groovy macros, which can be executed by any user with edit permissions on wiki pages. The high CVSS score of 9.9 indicates a critical vulnerability that poses a significant risk to the confidentiality, integrity, and availability of the XWiki instance.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• User-Editable Pages: Any user with the ability to edit wiki pages, such as their profile page, can inject malicious XWiki syntax.
• Search Administration Interface: The injected syntax can be executed when the search administration interface is accessed, leading to RCE.

Exploitation Methods:

• Groovy Macros: Attackers can inject Groovy macros within the XWiki syntax, which can execute arbitrary code on the server.
• Script Injection: Malicious scripts can be embedded within the id and label fields of search user interface extensions, leading to unauthorized actions.

3. Affected Systems and Software Versions

Affected Versions:

• XWiki Platform versions starting from 4.5-rc-1 up to but not including 14.10.15, 15.5.2, and 15.7-rc-1.

Unaffected Versions:

• XWiki Platform versions 14.10.15, 15.5.2, and 15.7-rc-1 and later.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade: Upgrade to the patched versions of XWiki Platform (14.10.15, 15.5.2, or 15.7-rc-1).
• Manual Patch: Apply the necessary escaping manually to the page XWiki.SearchAdmin if upgrading is not immediately 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 mitigate similar vulnerabilities.
• Monitoring: Implement monitoring and alerting for suspicious activities related to wiki page edits and search administration access.

5. Impact on Cybersecurity Landscape

The discovery of CVE-2023-50721 highlights the importance of proper input validation and escaping in web applications. This vulnerability underscores the potential risks associated with user-generated content and the need for robust security measures to prevent RCE attacks. Organizations using XWiki Platform should prioritize patching and implementing stringent access controls to mitigate such risks.

6. Technical Details for Security Professionals

Vulnerability Details:

• Root Cause: Insufficient escaping of id and label fields in the search administration interface.
• Exploitation: Injection of XWiki syntax containing script macros, including Groovy macros, leading to RCE.

Patch Information:

• Fixed Versions: The necessary escaping has been added in XWiki 14.10.15, 15.5.2, and 15.7-rc-1.
• Manual Patch: The patch can be manually applied to the page XWiki.SearchAdmin as a temporary workaround.

References:

• GitHub Commit
• GitHub Security Advisory
• Jira Issue Tracking

Conclusion: CVE-2023-50721 is a critical vulnerability that requires immediate attention from organizations using XWiki Platform. Upgrading to the patched versions and implementing strict access controls are essential steps to mitigate the risk of RCE attacks. Regular security audits and monitoring are recommended to ensure the ongoing security of the XWiki instance.