CVE-2018-0548 in Garoon
Summary
by MITRE
Cybozu Garoon 4.0.0 to 4.6.0 allows remote authenticated attackers to bypass access restriction to view the closed title of "Space" via unspecified vectors.
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Analysis
by VulDB Data Team • 01/25/2020
The vulnerability identified as CVE-2018-0548 affects Cybozu Garoon versions 4.0.0 through 4.6.0, representing a critical access control flaw that permits authenticated attackers to circumvent security measures protecting sensitive information. This issue specifically targets the "Space" feature within the platform, which is designed to contain confidential data and restrict access to authorized users only. The vulnerability stems from insufficient validation mechanisms that fail to properly enforce access restrictions for closed titles within the Space module, creating a pathway for unauthorized information disclosure.
The technical nature of this flaw involves improper authorization checks within the application's permission system, where the security controls that should prevent access to closed Space titles are either missing or inadequately implemented. Attackers who have authenticated credentials can exploit this weakness to access restricted content that should only be visible to specific users or groups. This represents a violation of the principle of least privilege and demonstrates a failure in the application's core security architecture. The unspecified vectors suggest that the vulnerability may be exploitable through multiple attack paths within the application's interface or API endpoints that handle Space title access requests.
The operational impact of this vulnerability extends beyond simple information disclosure, as it undermines the fundamental security model of the Garoon platform. Organizations relying on this system for collaborative workspaces and document management face significant risks including unauthorized access to sensitive business information, intellectual property exposure, and potential compliance violations. The vulnerability affects the integrity of the access control system, potentially allowing attackers to gather intelligence about internal structures, projects, or confidential communications that should remain restricted. This could enable further attacks through information gathering or social engineering opportunities that leverage the exposed data.
Security practitioners should implement immediate mitigations including applying the vendor-provided patches or updates that address the access control implementation. Organizations must review their current access control policies and conduct thorough audits of the Space module configurations to identify any potential exploitation attempts. The vulnerability aligns with CWE-285 which addresses improper authorization issues, and may relate to ATT&CK techniques involving privilege escalation and credential access. Additionally, network monitoring should be enhanced to detect unusual access patterns to Space titles, and regular security assessments should be conducted to identify similar authorization flaws within the application's architecture.