CVE-2014-2585 in ownCloud
Summary
by MITRE
ownCloud before 5.0.15 and 6.x before 6.0.2, when the file_external app is enabled, allows remote authenticated users to mount the local filesystem in the user's ownCloud via the mount configuration.
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Analysis
by VulDB Data Team • 05/08/2026
The vulnerability described in CVE-2014-2585 represents a critical access control flaw within the ownCloud file synchronization platform that affects versions prior to 5.0.15 and 6.0.2. This issue specifically targets the file_external application module which enables users to mount external storage systems within their ownCloud environment. The vulnerability arises from insufficient validation of mount configuration parameters, allowing authenticated users to exploit a path traversal mechanism that permits mounting of the local filesystem directly into the user's ownCloud instance. This flaw fundamentally undermines the security boundaries that should separate user-accessible storage from system-level filesystem components, creating a potential pathway for unauthorized system access and data exfiltration.
The technical implementation of this vulnerability stems from improper input validation within the file_external app's mount configuration handling mechanism. When users configure external storage mounts through the ownCloud web interface, the application fails to properly sanitize or validate the mount path parameters provided by authenticated users. This validation gap enables malicious users to craft mount configurations that point to local filesystem paths rather than intended remote storage locations. The vulnerability is particularly dangerous because it operates within the context of authenticated users, meaning attackers do not need to bypass authentication mechanisms but can exploit their legitimate access privileges to escalate their privileges and gain access to system resources that should remain isolated from user-controlled storage mounts.
The operational impact of CVE-2014-2585 extends beyond simple unauthorized access to encompass potential data breaches, system compromise, and privilege escalation scenarios. An attacker with authenticated access to an ownCloud instance can leverage this vulnerability to mount local filesystem directories including system configuration files, user credentials, application data, and potentially sensitive system directories. This capability enables comprehensive reconnaissance of the underlying system, data exfiltration, and in some cases, persistent access to system resources that could be exploited for further attacks. The vulnerability essentially removes the security isolation that should exist between user-accessible cloud storage and the underlying operating system, creating a potential backdoor for attackers to explore and exploit system-level resources.
This vulnerability aligns with CWE-22 Path Traversal and CWE-73 Path Traversal, both of which address improper validation of file paths that can lead to unauthorized access to system resources. The attack pattern follows ATT&CK techniques including T1059 Command and Scripting Interpreter and T1078 Valid Accounts, as attackers can leverage legitimate user accounts to perform malicious filesystem operations. Organizations using affected versions of ownCloud face significant risk from this vulnerability, as it allows for lateral movement within the system and potential escalation to administrative privileges. The impact is particularly severe in environments where ownCloud serves as a primary file sharing and synchronization platform, as the vulnerability can be exploited to access all user data and potentially system resources that are not properly isolated from user-controlled storage mounts.
The recommended mitigation strategy involves immediate deployment of patched versions of ownCloud, specifically version 5.0.15 or 6.0.2 and later, which contain proper input validation and sanitization mechanisms for external mount configurations. Organizations should also implement network-level restrictions to limit access to the file_external app functionality, disable unnecessary storage mount capabilities, and conduct comprehensive security audits of existing mount configurations to identify and remove any potentially compromised mounts. Additionally, implementing proper access controls and monitoring for unusual mount configuration changes can help detect exploitation attempts. System administrators should also consider implementing principle of least privilege for ownCloud user accounts and regularly review user access permissions to minimize the potential impact of credential compromise. The vulnerability demonstrates the critical importance of input validation in web applications and highlights the need for comprehensive security testing of storage and filesystem integration features in cloud-based platforms.