CVE-2019-6023 in Office
Summary
by MITRE
Cybozu Office 10.0.0 to 10.8.3 allows remote authenticated attackers to bypass access restriction which may result in obtaining data without access privileges via the application 'Address'.
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Analysis
by VulDB Data Team • 03/17/2024
The vulnerability identified as CVE-2019-6023 affects Cybozu Office versions 10.0.0 through 10.8.3, representing a critical access control flaw that undermines the application's security model. This issue specifically targets the Address application component within the broader Cybozu Office suite, which is designed for enterprise collaboration and document management. The vulnerability arises from insufficient authorization checks that allow authenticated users to bypass intended access restrictions, creating a pathway for unauthorized data access that directly violates fundamental security principles of least privilege and access control.
The technical implementation flaw stems from improper validation of user permissions within the Address application's request handling mechanism. When authenticated users make requests to specific endpoints within this component, the application fails to properly verify whether the requesting user possesses the necessary privileges to access the requested data or perform the requested operations. This weakness enables attackers to manipulate request parameters or leverage predictable access patterns to retrieve information that should be restricted to authorized personnel only. The vulnerability manifests as a privilege escalation condition where legitimate authenticated users can access data beyond their assigned permissions, effectively creating a backdoor within the application's access control framework.
From an operational impact perspective, this vulnerability presents significant risks to enterprise security and data integrity. Organizations utilizing affected Cybozu Office versions face potential exposure of sensitive business data, including contact information, employee details, and potentially confidential organizational records that should remain protected. The remote nature of the attack vector means that threat actors can exploit this vulnerability from external networks without requiring physical access to the organization's systems. This creates an elevated risk profile as attackers can systematically enumerate access controls and gather intelligence about organizational structures, personnel, and business relationships. The vulnerability also undermines the trust model that organizations rely upon for their collaboration platforms, potentially leading to data breaches, regulatory compliance violations, and reputational damage.
The vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems, and can be categorized under ATT&CK technique T1078 for valid accounts and T1566 for spearphishing with social engineering. Organizations should immediately implement the vendor-provided security patches and updates to address this vulnerability. Additionally, network segmentation and monitoring of access patterns within the Address application can help detect anomalous behavior indicative of exploitation attempts. Security teams should conduct thorough access control reviews and implement principle of least privilege enforcement to minimize potential impact if exploitation occurs. Regular security assessments of collaboration platforms and mandatory access control testing should be integrated into the organization's security posture to prevent similar vulnerabilities from emerging in other applications. The incident underscores the critical importance of robust access control implementation and continuous security validation in enterprise collaboration environments.