CVE-2016-1190 in Garoon
Summary
by MITRE
Cybozu Garoon 3.1 through 4.2 allows remote authenticated users to bypass intended restrictions on MultiReport reading via unspecified vectors.
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Analysis
by VulDB Data Team • 02/09/2019
The vulnerability identified as CVE-2016-1190 affects Cybozu Garoon versions 3.1 through 4.2, representing a significant authorization bypass flaw that undermines the security controls designed to protect MultiReport functionality. This issue stems from insufficient access control mechanisms that permit authenticated users to circumvent intended restrictions, potentially leading to unauthorized data exposure. The vulnerability operates through unspecified vectors within the application's permission model, suggesting a fundamental flaw in how the system validates user privileges for report access. Organizations utilizing these Garoon versions face heightened risk of data leakage and unauthorized information disclosure, particularly in environments where sensitive business data is processed through MultiReport features.
The technical implementation of this vulnerability demonstrates a weakness in the application's authorization framework, where proper access controls fail to validate user permissions against MultiReport reading capabilities. This flaw allows attackers who have already established authentication credentials to exploit the system's trust model and gain access to restricted report data that should only be available to authorized personnel. The unspecified vectors indicate that the vulnerability may manifest through multiple pathways within the application's architecture, making it particularly challenging to fully assess and remediate. Such authorization bypass vulnerabilities typically fall under CWE-285, which addresses improper authorization issues in software systems. The vulnerability represents a critical gap in the principle of least privilege enforcement, where the system fails to properly validate that authenticated users possess the necessary permissions to access specific data resources.
The operational impact of this vulnerability extends beyond simple data exposure, as it compromises the integrity of the organization's information security posture and potentially violates regulatory compliance requirements for data protection. Attackers exploiting this vulnerability could access sensitive business intelligence, financial reports, personnel data, or other confidential information that should remain restricted to authorized personnel only. The risk is particularly elevated in corporate environments where Garoon serves as a central collaboration platform for business-critical information sharing. This vulnerability creates opportunities for insider threats or external attackers who have gained initial access to the system, as they can leverage the authorization bypass to escalate their privileges and access additional restricted resources. The impact aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation through legitimate system access.
Organizations should immediately implement mitigations including updating to the latest supported versions of Cybozu Garoon where the vulnerability has been addressed, applying security patches provided by the vendor, and implementing additional access controls through network segmentation and monitoring. Security teams should conduct comprehensive audits of MultiReport access controls and user permissions to identify any potential exploitation attempts. The remediation process should include disabling unnecessary MultiReport functionality where possible and implementing strict role-based access controls that align with the principle of least privilege. Regular security assessments of collaboration platforms and continuous monitoring of access logs should be established to detect anomalous behavior patterns that might indicate exploitation attempts. Organizations should also consider implementing additional security layers such as web application firewalls and privileged access management solutions to provide defense-in-depth against similar authorization bypass vulnerabilities.