CVE-2014-3834 in ownCloud
Summary
by MITRE
ownCloud Server before 6.0.3 does not properly check permissions, which allows remote authenticated users to (1) access the contacts of other users via the address book or (2) rename files via unspecified vectors.
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Analysis
by VulDB Data Team • 03/31/2025
The vulnerability identified as CVE-2014-3834 affects ownCloud Server versions prior to 6.0.3 and represents a critical permission bypass flaw that undermines the security model of the file sharing and collaboration platform. This vulnerability exists within the core access control mechanisms of the application, where proper authorization checks are insufficiently implemented, allowing authenticated users to exploit weaknesses in the permission system. The flaw specifically targets the address book functionality and file renaming operations, creating pathways for unauthorized data access and manipulation that could significantly compromise user privacy and system integrity.
The technical implementation of this vulnerability stems from inadequate validation of user permissions within the application's backend services. When users authenticate to the ownCloud server, the system should enforce strict access controls that prevent one user from accessing another user's contacts or modifying files they do not own. However, the flawed permission checking mechanism fails to properly verify user credentials against resource ownership, enabling malicious actors to traverse these boundaries. The unspecified vectors for file renaming suggest that the vulnerability may manifest through multiple attack surfaces within the file management subsystem, potentially including API endpoints, web interface interactions, or direct protocol implementations that do not properly validate the authenticated user's rights to perform specific operations.
The operational impact of CVE-2014-3834 extends beyond simple data exposure, as it creates persistent security risks that could be exploited for broader compromise within the ownCloud environment. Attackers with valid accounts could systematically access other users' contact information, potentially harvesting sensitive personal data or corporate contact lists that could be used for social engineering attacks. Additionally, the ability to rename files opens possibilities for data manipulation, including the potential to overwrite important files, rename critical system files, or create confusion through unauthorized file modifications that could disrupt legitimate business operations. This vulnerability particularly affects organizations that rely on ownCloud for collaborative work environments where users share common systems and trust relationships may be exploited for unauthorized access.
Organizations affected by this vulnerability should immediately implement the patch released by ownCloud for version 6.0.3, which addresses the core permission checking logic and strengthens authorization controls. Security teams should conduct comprehensive audits of their ownCloud installations to verify that all instances have been updated and that no older versions remain accessible. Network monitoring should be enhanced to detect anomalous access patterns that might indicate exploitation attempts, particularly around address book access and file renaming operations. The vulnerability aligns with CWE-284, which describes improper access control issues in software systems, and represents a clear violation of the principle of least privilege that should govern all multi-user systems. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation and credential access techniques, as attackers can leverage their legitimate authentication to gain unauthorized access to additional resources beyond their intended scope. Organizations should also consider implementing additional security controls such as mandatory access controls, enhanced logging of permission-related events, and regular security assessments of their cloud storage environments to prevent similar vulnerabilities from emerging in future releases.