CVE-2012-5056 in ownCloud
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in ownCloud Server before 4.0.8 allow remote attackers to inject arbitrary web script or HTML via the (1) readyCallback parameter to apps/files_odfviewer/src/webodf/webodf/flashput/PUT.swf, the (2) root parameter to apps/gallery/templates/index.php, or a (3) malformed query to lib/db.php.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 03/31/2025
The CVE-2012-5056 vulnerability represents a critical cross-site scripting flaw affecting ownCloud Server versions prior to 4.0.8, demonstrating the persistent challenge of input validation in web-based file sharing platforms. This vulnerability manifests across three distinct attack vectors within the ownCloud ecosystem, highlighting the complexity of securing comprehensive web applications that handle diverse user inputs and third-party integrations. The vulnerability classifies under CWE-79 as a failure to sanitize input, specifically allowing attackers to inject malicious scripts that can execute in the context of other users' browsers, potentially compromising the entire user session and data access.
The technical exploitation occurs through three specific parameters that fail to properly validate or sanitize user input before rendering in web responses. The first vector involves the readyCallback parameter within the apps/files_odfviewer/src/webodf/webodf/flashput/PUT.swf component, where unfiltered input can be passed directly to flash objects, enabling attackers to inject malicious JavaScript code that executes when the flash viewer loads. The second vulnerability exists in apps/gallery/templates/index.php through the root parameter, where insufficient input validation allows attackers to inject script code that gets rendered in gallery template outputs. The third attack vector is found in lib/db.php where malformed query parameters can bypass validation checks and inject malicious code into database operations, creating a chain reaction that affects the entire application's data handling capabilities.
The operational impact of these vulnerabilities extends beyond simple script injection, creating potential pathways for session hijacking, data theft, and privilege escalation within the ownCloud environment. An attacker exploiting these flaws could gain unauthorized access to user files, manipulate shared resources, or execute commands with elevated privileges depending on the victim's access level. The attack surface is particularly concerning given that ownCloud serves as a file sharing and synchronization platform where users frequently store sensitive corporate or personal data. The vulnerabilities demonstrate how third-party components like flash viewers and gallery templates can introduce security gaps that are difficult to detect through conventional security scanning, as these elements often operate outside the primary application's security boundaries.
Mitigation strategies for CVE-2012-5056 should focus on immediate patching of the affected ownCloud versions, implementing comprehensive input validation across all user-supplied parameters, and establishing proper output encoding for dynamic content. Organizations should deploy web application firewalls to detect and block suspicious input patterns, while also implementing Content Security Policy headers to prevent script execution in response to malicious input. The vulnerability highlights the importance of secure coding practices, particularly around parameter validation and sanitization, as outlined in the OWASP Top Ten security principles and aligned with ATT&CK technique T1213 for data from information repositories. Regular security assessments and penetration testing of third-party components should be conducted to identify similar vulnerabilities that may exist in integrated modules, as the attack vectors demonstrate how seemingly isolated components can create widespread security implications within complex web applications.