CVE-2012-5606 in ownCloud
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in ownCloud before 4.0.9 and 4.5.0 allow remote attackers to inject arbitrary web script or HTML via the (1) file name to apps/files_versions/js/versions.js or (2) apps/files/js/filelist.js; or (3) event title to 3rdparty/fullcalendar/js/fullcalendar.js.
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Analysis
by VulDB Data Team • 03/31/2025
The vulnerability identified as CVE-2012-5606 represents a critical cross-site scripting flaw affecting ownCloud versions prior to 4.0.9 and 4.5.0. This vulnerability stems from insufficient input validation and output encoding mechanisms within the web application's file management and calendar components, creating exploitable entry points for malicious actors to execute arbitrary web scripts in the context of authenticated users' browsers. The affected files span across multiple core components including the versions.js, filelist.js, and fullcalendar.js modules, indicating a widespread issue within the application's user interface and data handling processes.
The technical exploitation of this vulnerability occurs through three distinct attack vectors that target different JavaScript modules within the ownCloud ecosystem. The first vector involves injecting malicious content into file names within the versions.js module, which handles file versioning functionality. The second vector targets the filelist.js module responsible for displaying file listings, while the third vector exploits the fullcalendar.js module used for event management. These attack surfaces demonstrate a fundamental flaw in the application's data sanitization practices, where user-provided input is not adequately escaped or validated before being rendered in web pages. The vulnerability aligns with CWE-79, which specifically addresses Cross-Site Scripting flaws, and represents a classic case of insufficient output escaping in web applications.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, data theft, and privilege escalation attacks against authenticated users. When a victim accesses a maliciously crafted file name or calendar event, the injected scripts execute within their browser context, potentially allowing attackers to steal session cookies, redirect users to malicious sites, or manipulate application data. The attack requires minimal privileges since it targets authenticated users, making it particularly dangerous in environments where users have administrative capabilities. This vulnerability directly maps to several ATT&CK techniques including T1566 for credential access through social engineering and T1059 for command and script injection, demonstrating how the flaw can serve as a launchpad for more sophisticated attacks.
Mitigation strategies for CVE-2012-5606 primarily involve upgrading to patched versions of ownCloud, specifically versions 4.0.9 and 4.5.0 or later, which contain proper input validation and output encoding mechanisms. Organizations should implement comprehensive input sanitization practices, including HTML escaping of all user-provided content before rendering, and establish strict validation rules for file names and calendar event titles. Additionally, security headers such as Content Security Policy should be implemented to prevent execution of unauthorized scripts. Regular security assessments and code reviews focusing on input handling and output encoding practices are essential for preventing similar vulnerabilities. The vulnerability highlights the critical importance of maintaining up-to-date software and implementing defense-in-depth strategies that include both application-level protections and network-level monitoring to detect potential exploitation attempts.