CVE-2012-4392 in ownCloud
Summary
by MITRE
index.php in ownCloud 4.0.7 does not properly validate the oc_token cookie, which allows remote attackers to bypass authentication via a crafted oc_token cookie value.
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Analysis
by VulDB Data Team • 03/31/2025
The vulnerability identified as CVE-2012-4392 affects ownCloud version 4.0.7 and represents a critical authentication bypass flaw stemming from inadequate validation of the oc_token cookie parameter. This weakness resides in the index.php file of the web application, where the system fails to properly verify the authenticity and integrity of the oc_token cookie value. The flaw allows remote attackers to manipulate the cookie value and gain unauthorized access to user accounts without proper authentication credentials.
The technical implementation of this vulnerability demonstrates a classic case of insufficient input validation and authentication checks within the web application's session management system. When users attempt to access ownCloud resources, the system relies on the oc_token cookie to verify their authenticated status. However, the application does not perform adequate cryptographic validation or verification of this cookie's contents, creating an exploitable condition where attackers can craft malicious cookie values that will be accepted as legitimate by the authentication mechanism.
From an operational impact perspective, this vulnerability presents a severe risk to organizations relying on ownCloud for file sharing and collaboration services. Attackers exploiting this flaw can bypass authentication entirely and gain access to sensitive user data, including documents, files, and personal information stored within the ownCloud environment. The remote nature of the attack means that threat actors do not require physical access to the system or local network privileges to exploit this vulnerability, making it particularly dangerous in cloud and web-based deployment scenarios. The attack vector allows for unauthorized data access, potential data exfiltration, and could serve as a stepping stone for further lateral movement within affected networks.
This vulnerability aligns with CWE-287, which addresses improper authentication issues in software applications, and relates to ATT&CK technique T1078.004 for Valid Accounts - Cloud Accounts, as it enables unauthorized access to legitimate user accounts through manipulation of authentication tokens. The flaw also connects to ATT&CK technique T1190 for Exploit Public-Facing Application, as it represents an unauthenticated vulnerability in a publicly accessible web application component. Organizations should immediately implement mitigations including updating to patched versions of ownCloud, implementing proper cookie validation mechanisms, and monitoring for suspicious authentication attempts. Additional protective measures include deploying web application firewalls, implementing strict session management policies, and conducting regular security assessments of web applications to identify similar authentication bypass vulnerabilities. The vulnerability underscores the critical importance of robust input validation and proper authentication token handling in web applications, particularly those handling sensitive user data in cloud environments.