Overview
The cybersecurity landscape is a battlefield filled with evolving threats and vulnerabilities. One recent vulnerability of note is CVE-2025-55729, which affects XWiki Remote Macros, a feature widely used in XWiki for content migration from Confluence. This vulnerability is particularly concerning due to its potential for remote code execution by any user with page edit access, potentially leading to severe consequences such as system compromise or data leakage. Given the widespread usage of XWiki, understanding and mitigating this vulnerability is of paramount importance.
Vulnerability Summary
CVE ID: CVE-2025-55729
Severity: Critical (CVSS: 10.0)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
XWiki Remote Macros | 1.0 to 1.26.4
How the Exploit Works
The vulnerability stems from a lack of proper escaping in the ‘ac:type’ parameter within the ConfluenceLayoutSection macro. This oversight allows for XWiki syntax injection, leading to the possibility of remote code execution. The ‘classes’ parameter, in particular, is used without escaping, which further enables this injection. Essentially, any user who can edit any page can potentially exploit this vulnerability to execute arbitrary code.
Conceptual Example Code
Consider a malicious user who decides to exploit this vulnerability. They could potentially insert malicious code into the ‘classes’ parameter. Here’s a conceptual example of how this might look:
{{velocity}}
#set($className = "com.xpn.xwiki.objects.classes.StringClass")
#set($xwiki = $services.xwiki)
#set($context = $services.xwiki.context)
#set($doc = $xwiki.getDocument("XWiki.Class"))
#set($class = $doc.newXObject("XWiki.Class", $context))
#set($field = $class.newField($className))
$field.setName("malicious_payload")
$field.setPrettyName("Malicious Payload")
$field.setNumber(1)
$field.setCustomDisplay("")
$field.setPicker(false)
$doc.save("Created class")
{{/velocity}}In this example, the malicious payload is injected into the ‘classes’ parameter, leading to the potential for remote code execution. The parameters are not properly escaped, and thus, the XWiki syntax injection is possible.
Mitigation Measures
The best way to mitigate this vulnerability is by applying the vendor patch. XWiki has released version 1.26.5, which includes a fix for this vulnerability. If an immediate upgrade is not possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could serve as temporary mitigation measures. However, these should not replace the need for a proper patch. It is crucial to always keep systems updated to the latest version to prevent exploitation of known vulnerabilities.