CVE-2016-4910 in Garoon
Summary
by MITRE
Cybozu Garoon 3.0.0 to 4.2.2 allows remote authenticated attackers to bypass access restriction to delete other operational administrators' MultiReport filters via unspecified vectors.
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Analysis
by VulDB Data Team • 12/26/2020
The vulnerability identified as CVE-2016-4910 affects Cybozu Garoon versions 3.0.0 through 4.2.2, representing a significant access control flaw that undermines the security posture of this collaboration platform. This issue permits authenticated attackers to escalate their privileges and bypass intended access restrictions, specifically targeting the deletion of MultiReport filters owned by other operational administrators. The vulnerability resides within the application's permission model and authorization mechanisms, where proper access controls fail to validate whether a user should have the capability to modify or delete resources belonging to other administrators.
The technical implementation of this vulnerability stems from insufficient input validation and inadequate privilege checking within the MultiReport filter management functionality. Attackers who have authenticated access to the system can exploit unspecified vectors to manipulate the application's internal logic, potentially gaining unauthorized access to administrative functions typically restricted to privileged users. This flaw operates at the application layer and leverages the trust model inherent in the authentication process, where legitimate credentials are used to perform actions outside the scope of normal user permissions. The vulnerability demonstrates a clear failure in the principle of least privilege and proper access control enforcement.
From an operational impact perspective, this vulnerability creates a serious risk for organizations relying on Cybozu Garoon for business collaboration and document management. An attacker with access to the system can not only delete critical MultiReport filters but potentially disrupt business processes that depend on these administrative configurations. The ability to bypass access restrictions to administrative functions compromises the integrity of the system's security model and could lead to data loss, operational disruption, and potential information disclosure. The vulnerability affects the confidentiality, integrity, and availability of the platform's administrative features, particularly impacting the system's ability to maintain proper access controls.
Organizations should implement immediate mitigations including applying the vendor-provided patches or updates that address this access control vulnerability, reviewing and strengthening the application's authentication and authorization mechanisms, and conducting comprehensive access control reviews to identify similar privilege escalation opportunities. Network segmentation and monitoring of administrative activities should be enhanced to detect anomalous behavior patterns. The vulnerability aligns with CWE-284, which addresses improper access control issues, and relates to ATT&CK techniques involving privilege escalation and persistence mechanisms. Regular security assessments and vulnerability scanning should be conducted to identify similar access control weaknesses in the broader system architecture, particularly focusing on administrative interfaces and user privilege management components.