CVE-2022-3893 in BlueSpice
Summary
by MITRE • 11/15/2022
Cross-site Scripting (XSS) vulnerability in BlueSpiceCustomMenu extension of BlueSpice allows user with admin permissions to inject arbitrary HTML into the custom menu navigation of the application.
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Analysis
by VulDB Data Team • 12/18/2022
The CVE-2022-3893 vulnerability represents a critical cross-site scripting flaw within the BlueSpiceCustomMenu extension of the BlueSpice MediaWiki extension suite. This vulnerability specifically targets the custom menu navigation functionality where administrators can configure and manage menu structures for their wiki applications. The flaw exists in how the extension processes and renders user-provided input within the menu configuration interface, creating an avenue for malicious code injection that can persist across user sessions.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the BlueSpiceCustomMenu extension. When administrators configure custom menu items, the extension fails to properly sanitize or escape user-supplied HTML content before rendering it in the browser context. This allows an authenticated administrator with appropriate permissions to inject malicious scripts that execute in the context of other users' browsers. The vulnerability is particularly concerning because it leverages the elevated privileges of administrative accounts, amplifying the potential impact of the attack vector.
The operational impact of CVE-2022-3893 extends beyond simple script execution, as it can enable sophisticated attack chains that compromise entire wiki environments. An attacker who gains administrative access can manipulate menu structures to redirect users to malicious domains, steal session cookies, or execute arbitrary commands within the browser context. This vulnerability directly aligns with CWE-79 which categorizes cross-site scripting as a code injection flaw, and maps to ATT&CK technique T1531 which involves the use of malicious code in web applications. The persistent nature of menu configurations means that malicious scripts can affect multiple users over extended periods until the menu is updated or the vulnerability is patched.
Mitigation strategies for this vulnerability require immediate patching of the BlueSpiceCustomMenu extension to implement proper input sanitization and output encoding mechanisms. Organizations should enforce strict input validation that filters out potentially dangerous HTML tags and attributes while maintaining legitimate menu functionality. The principle of least privilege should be enforced by limiting administrative permissions to only those users who absolutely require them, reducing the attack surface. Network segmentation and monitoring solutions should be deployed to detect anomalous menu configuration changes that might indicate exploitation attempts. Additionally, regular security audits of wiki extensions and configurations should be conducted to identify similar vulnerabilities in other components of the BlueSpice ecosystem, ensuring comprehensive protection against similar attack vectors that may exist in the broader MediaWiki extension landscape.