Executive Summary

This vulnerability exists in the XWiki Remote Macros, specifically in the ConfluenceLayoutSection macro. It occurs because the macro does not properly escape the 'ac:type' attribute in the 'classes' parameter, which is processed as XWiki syntax without escaping. This allows an attacker who can edit any page to inject malicious XWiki syntax, leading to remote code execution on the affected system. The issue was fixed in version 1.26.5 by properly escaping the input to prevent injection. [1, 2]

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Impact Analysis

This vulnerability can have severe impacts including remote code execution by an attacker with edit permissions on any page. It allows the attacker to execute arbitrary code remotely, which can lead to full compromise of the system's confidentiality, integrity, and availability. This means an attacker could disclose sensitive data, modify or delete data, and disrupt services completely. [2]

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Detection Guidance

This vulnerability can be detected by checking if your XWiki Pro Macros package version is between 1.0 and prior to 1.26.5, as these versions are vulnerable. Additionally, you can look for the presence of malicious payloads in the 'classes' parameter of the ConfluenceLayoutSection macro, such as XWiki syntax injections or Groovy code snippets like '{{groovy}}...{{/groovy}}'. There is no specific network command provided, but inspecting page content or macro parameters for suspicious code injections is recommended. [2]

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Mitigation Strategies

The immediate step to mitigate this vulnerability is to upgrade the XWiki Pro Macros package to version 1.26.5 or later, where the issue has been fixed by properly escaping the 'ac:type' parameter in the ConfluenceLayoutSection macro. This fix prevents unsafe content rendering and remote code execution. Until the upgrade, restrict edit permissions to trusted users only to reduce the risk of exploitation. [1, 2]

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