CVE-2012-4397 in ownCloud
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in ownCloud before 4.0.1 allow remote attackers to inject arbitrary web script or HTML via the (1) calendar displayname to part.choosecalendar.rowfields.php or (2) part.choosecalendar.rowfields.shared.php in apps/calendar/templates/; or (3) unspecified vectors to apps/contacts/lib/vcard.php.
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Analysis
by VulDB Data Team • 03/31/2025
The CVE-2012-4397 vulnerability represents a critical cross-site scripting flaw affecting ownCloud versions prior to 4.0.1, specifically targeting the calendar and contacts applications within the platform. This vulnerability stems from inadequate input validation and sanitization mechanisms within the web application's user interface components, creating persistent attack vectors that allow remote threat actors to execute malicious scripts in the context of authenticated users' browsers. The vulnerability manifests in three distinct attack vectors within the calendar application's template files and the contacts application's vcard library, exposing the platform to sophisticated phishing attacks and session hijacking attempts. The affected files part.choosecalendar.rowfields.php and part.choosecalendar.rowfields.shared.php in the calendar application's templates directory, along with the apps/contacts/lib/vcard.php file, all suffer from insufficient sanitization of user-supplied input that flows directly into HTML output contexts.
The technical exploitation of this vulnerability relies on the application's failure to properly escape or validate user-provided data before rendering it within web pages. When users interact with the calendar display name fields or when shared calendar data is processed, malicious input containing script tags or other HTML elements can be executed in the browser context of legitimate users. This flaw operates under the Common Weakness Enumeration CWE-79 category, which specifically addresses Cross-Site Scripting vulnerabilities where web applications fail to properly validate or escape user-controllable data. The vulnerability's impact is amplified by its presence in core application components that handle user interaction and data sharing, making it particularly dangerous for organizations relying on ownCloud for collaborative environments.
The operational impact of CVE-2012-4397 extends beyond simple script execution, as it enables attackers to potentially steal user sessions, modify calendar data, access shared resources, and conduct further reconnaissance within the compromised environment. Attackers can craft malicious calendar names or contact entries that, when viewed by other users, execute scripts that capture authentication tokens or redirect users to malicious sites. This vulnerability particularly affects collaborative environments where users share calendars and contact information, as the attack surface expands significantly when considering that shared calendar data processing occurs in the part.choosecalendar.rowfields.shared.php file. The exposure of this vulnerability in the contacts application's vcard.php library creates additional risk for organizations where contact data management is critical to business operations.
Organizations affected by this vulnerability should implement immediate mitigation strategies including updating to ownCloud version 4.0.1 or later, which contains the necessary patches to address the XSS flaws. Additionally, administrators should consider implementing content security policies to limit script execution within the application context, and establish regular input validation procedures for all user-supplied data. The vulnerability demonstrates the importance of comprehensive input sanitization across all application components, particularly in collaborative platforms where user-generated content flows through multiple processing stages. Security teams should also conduct thorough vulnerability assessments to identify similar patterns in other applications and ensure proper adherence to secure coding practices that prevent XSS vulnerabilities from occurring in future development cycles. The ATT&CK framework categorizes this vulnerability under T1059.001 for command and scripting interpreter, as attackers can leverage the XSS to execute malicious commands through the browser environment, and T1566 for spearphishing with attachments, as the vulnerability can be exploited through malicious calendar or contact entries.