CVE-2014-5243 in MediaWiki
Summary
by MITRE
MediaWiki before 1.19.18, 1.20.x through 1.22.x before 1.22.9, and 1.23.x before 1.23.2 does not enforce an IFRAME protection mechanism for transcluded pages, which makes it easier for remote attackers to conduct clickjacking attacks via a crafted web site.
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Analysis
by VulDB Data Team • 03/28/2022
MediaWiki versions prior to 1.19.18, 1.20.x through 1.22.x before 1.22.9, and 1.23.x before 1.23.2 contain a critical security flaw that undermines the platform's iframe protection mechanisms. This vulnerability specifically affects the transclusion functionality within MediaWiki, which allows pages to embed content from other pages. The flaw occurs because the system fails to properly enforce iframe security measures when processing transcluded content, creating an exploitable condition that enables malicious actors to manipulate how embedded content appears to end users. This weakness directly impacts the security model of MediaWiki installations that rely on transclusion for content integration across multiple pages or wikis.
The technical implementation of this vulnerability stems from insufficient validation of iframe attributes and security headers when rendering transcluded content. When MediaWiki processes a page that includes transclusion, it should enforce strict security policies to prevent malicious websites from embedding the wiki content within their own pages using iframe elements. However, the vulnerability allows attackers to craft malicious websites that can overlay legitimate MediaWiki content with deceptive interfaces, potentially tricking users into performing unintended actions. The flaw operates at the application layer, specifically within the rendering and content embedding components of the MediaWiki framework, making it particularly dangerous for collaborative platforms where users frequently interact with embedded content from multiple sources.
The operational impact of this vulnerability extends beyond simple clickjacking attacks, as it fundamentally compromises the trust model that MediaWiki relies upon for content sharing and collaboration. Attackers can exploit this weakness to create deceptive user interfaces that appear to be legitimate wiki pages while actually directing users to malicious sites or collecting sensitive information. The vulnerability is particularly concerning for large MediaWiki installations that host sensitive content or facilitate user-generated content, as it enables sophisticated social engineering campaigns that can bypass normal security expectations. Organizations using affected MediaWiki versions face increased risk of credential theft, unauthorized access to privileged content, and potential data exfiltration through carefully crafted clickjacking scenarios that leverage the transclusion functionality.
This vulnerability aligns with CWE-1021, which addresses improper restriction of operations within a limited context, and maps to ATT&CK technique T1071.004 for application layer protocol manipulation. The flaw demonstrates how seemingly benign functionality like content transclusion can become a security vector when proper sandboxing and isolation mechanisms are not properly implemented. Organizations should immediately upgrade to patched MediaWiki versions to address this vulnerability, as the risk of exploitation increases with the complexity of the embedded content and the sophistication of the attacking website. Additional mitigations include implementing content security policies that restrict iframe embedding, monitoring for suspicious transclusion patterns, and educating users about the risks of interacting with untrusted wiki content. The vulnerability also highlights the importance of maintaining up-to-date security practices in collaborative platforms and the necessity of thorough security testing for all content embedding mechanisms within web applications.