CVE-2018-0550 in Garoon
Summary
by MITRE
Cybozu Garoon 3.5.0 to 4.6.1 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-2018-0550 affects Cybozu Garoon versions 3.5.0 through 4.6.1, representing a significant access control weakness that undermines the security posture of this collaborative platform. This issue permits authenticated attackers to circumvent intended restrictions and gain unauthorized visibility into closed "Space" titles, which are typically protected from unauthorized access within the system's permission model. The vulnerability exists within the access restriction mechanisms that govern how users interact with different sections of the platform, specifically targeting the confidentiality controls associated with private or restricted spaces.
The technical flaw manifests through unspecified vectors that allow attackers to exploit weaknesses in the authorization framework. This type of vulnerability falls under the category of improper access control as defined by CWE-285, where the system fails to properly enforce access restrictions for protected resources. The authentication requirement is bypassed through manipulation of the system's internal access control logic, enabling an attacker who has already established credentials to escalate their privileges and view content they should not normally have access to. The vulnerability represents a privilege escalation issue within the context of existing user authentication, where the attacker leverages their authenticated status to gain unauthorized access to restricted information.
The operational impact of this vulnerability extends beyond simple information disclosure, as it compromises the fundamental security model of the collaboration platform. When attackers can view closed space titles, they gain insights into organizational structures, project names, and potentially sensitive business information that should remain confidential within the system. This exposure can lead to targeted social engineering attacks, competitive intelligence gathering, and potentially more severe exploitation opportunities if the closed spaces contain additional sensitive data or functionality. The vulnerability undermines trust in the platform's access control mechanisms and could enable further attacks if the closed spaces contain other vulnerable components or information that could be exploited.
Organizations utilizing affected versions of Cybozu Garoon should prioritize immediate remediation through official patches provided by the vendor, as the vulnerability affects a core security function of the platform. The mitigation strategy should include implementing network segmentation to limit access to the platform, conducting thorough access control reviews, and monitoring for suspicious activities that might indicate exploitation attempts. Security teams should also consider implementing additional logging and monitoring around access attempts to closed spaces to detect potential abuse of this vulnerability. From a compliance perspective, this vulnerability could impact organizations subject to data protection regulations such as gdpr or hipaa, as it represents a failure to maintain proper access controls over sensitive information. The issue aligns with attack patterns documented in the mitre att&ck framework under privilege escalation techniques, where attackers leverage existing credentials to gain unauthorized access to restricted resources. Organizations should also review their overall access control policies and ensure that proper least privilege principles are maintained across all collaborative platforms to prevent similar vulnerabilities from occurring in other systems.