CVE-2012-4394 in ownCloud
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in apps/files/js/filelist.js in ownCloud before 4.0.5 allows remote attackers to inject arbitrary web script or HTML via the file parameter.
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Analysis
by VulDB Data Team • 03/31/2025
The CVE-2012-4394 vulnerability represents a critical cross-site scripting flaw in the ownCloud file sharing platform that affected versions prior to 4.0.5. This vulnerability resides within the filelist.js JavaScript file located in the apps/files directory of the ownCloud application. The flaw enables remote attackers to execute malicious web scripts or HTML code by manipulating the file parameter, which is processed and rendered within the web interface without proper input sanitization. The vulnerability specifically impacts the client-side rendering of file names and metadata, creating an avenue for persistent XSS attacks that can compromise user sessions and data integrity.
The technical implementation of this vulnerability stems from insufficient validation and sanitization of user-provided input within the JavaScript client-side code. When users navigate through file lists or perform operations that involve file names, the application fails to properly escape or encode special characters in the file parameter before rendering them in the HTML output. This allows attackers to inject malicious payloads that execute in the context of other users' browsers, particularly when those users view the affected file listings. The vulnerability operates at the application layer and leverages the trust relationship between the web application and its users, making it particularly dangerous in collaborative environments where multiple users interact with shared file systems.
From an operational impact perspective, this vulnerability creates significant security risks for ownCloud deployments, particularly in enterprise environments where users may have varying levels of privilege and access to sensitive data. Attackers can exploit this vulnerability to steal session cookies, redirect users to malicious sites, or inject persistent malware that executes whenever affected users access the file sharing interface. The attack vector is particularly concerning because it requires minimal user interaction beyond accessing the vulnerable file listing, and the malicious code executes automatically in the context of the victim's authenticated session. This vulnerability can lead to unauthorized data access, data exfiltration, and potential complete compromise of user accounts within the ownCloud environment.
Organizations should implement immediate mitigations including updating to ownCloud version 4.0.5 or later, which contains the necessary patches to address the XSS vulnerability through proper input validation and output encoding. Additional defensive measures include implementing content security policies that restrict script execution within the application, enabling proper input sanitization at multiple layers of the application architecture, and conducting regular security assessments of client-side JavaScript components. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws, and represents a classic example of insecure input handling that violates fundamental web application security principles. Security practitioners should also consider implementing web application firewalls and monitoring for suspicious parameter values in file-related requests to detect potential exploitation attempts. The ATT&CK framework categorizes this vulnerability under the initial access and execution phases, where adversaries leverage client-side vulnerabilities to establish persistent access to user sessions and potentially escalate privileges within the file sharing environment.