Horizon Alert
Summary of the vulnerability and why it matters
This advisory addresses a critical vulnerability in XWiki Remote Macros, specifically impacting how the 'column' macro processes a 'width' parameter. The flaw allows for remote code execution, meaning an attacker could potentially run unauthorized commands on the affected system. The main concern is confirming relevance and exposure to this specific macro functionality.
- Unescaped parameter enables code execution.
- Affects collaborative content editing platforms.
- Confirm if your wiki uses this specific macro.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this vulnerability by crafting a malicious input within a wiki page that uses the column macro. This input would leverage the unescaped "width" parameter to inject XWiki syntax, leading to the execution of arbitrary code. The impact could range from executing Velocity code as the wiki administrator to full remote code execution, depending on the privileges of the user who installed the macro.
- No authentication required to access.
- Injecting malicious syntax into the width parameter.
- Remote code execution or admin-level code execution.
Live Threat
Current exploitation, exposure, and threat context
When XWiki Remote Macros are used with a missing width parameter escaping in the column macro, it could allow for remote code execution. This could occur for any user who can edit pages or access the CKEditor converter. The vulnerability enables the injection of XWiki syntax, potentially leading to the execution of Velocity code with wiki administrator privileges.
- Affected: Wiki pages and administrator privileges.
- Exposure: Malicious code injection via macro parameters.
- Consequence: Potential for unauthorized code execution.
Operational Fix
Recommended remediation, mitigation, and detection steps
The XWiki Remote Macros vulnerability likely falls under the responsibility of the XWiki administrators or the team managing the XWiki platform, as it impacts page editing and macro functionality. The first practical step is to identify all XWiki instances, determine their accessibility and criticality, and confirm the specific version of the pro_macros component in use. Once ownership is confirmed, a risk-based remediation plan can be developed, which may involve vendor coordination if the pro_macros component is provided by a third party.
- Identify XWiki instances and accountable owners.
- Verify installed pro_macros component versions.
- Plan remediation based on confirmed exposure.
