CVE-2018-0533 in Garoon
Summary
by MITRE
Cybozu Garoon 3.0.0 to 4.2.6 allows remote authenticated attackers to bypass access restriction to alter setting data of session authentication via unspecified vectors.
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Analysis
by VulDB Data Team • 01/25/2020
The vulnerability identified as CVE-2018-0533 affects Cybozu Garoon versions 3.0.0 through 4.2.6, representing a critical access control flaw that undermines the security posture of this enterprise collaboration platform. This issue specifically targets the session authentication mechanism, allowing authenticated attackers to bypass intended access restrictions and modify sensitive session configuration data. The vulnerability stems from insufficient validation of user permissions during authentication-related operations, creating a pathway for privilege escalation and unauthorized system modifications.
Technical exploitation of this vulnerability occurs through unspecified vectors that likely involve manipulation of authentication tokens or session parameters within the Garoon application framework. The flaw resides in the application's authorization logic where proper checks are not enforced when users attempt to modify session authentication settings. This weakness enables attackers who have already established valid authentication credentials to perform actions beyond their intended privileges, potentially compromising the integrity of the authentication system itself. The vulnerability demonstrates characteristics consistent with CWE-285, which addresses improper authorization issues in software applications, and aligns with ATT&CK technique T1078 for valid accounts and T1548 for abuse of privileges.
The operational impact of this vulnerability extends beyond simple data modification, as it fundamentally undermines the trust model of the Garoon platform. Attackers can manipulate session authentication parameters to gain elevated privileges or alter security configurations that protect against unauthorized access. This compromise can lead to complete system infiltration where attackers establish persistent access or escalate privileges to administrative levels. Organizations using affected versions of Garoon face significant risk of data breaches, unauthorized system modifications, and potential lateral movement within their network infrastructure. The vulnerability affects the core authentication mechanisms that protect enterprise collaboration environments, making it particularly dangerous for organizations relying on Garoon for business-critical communication and workflow processes.
Mitigation strategies should prioritize immediate patching of affected systems to version 4.2.7 or later, which contains the necessary security fixes for this vulnerability. Organizations should implement additional monitoring of authentication-related activities and session parameter modifications to detect potential exploitation attempts. Network segmentation and least-privilege access controls can help limit the potential impact if exploitation occurs, while regular security audits of authentication configurations should be conducted to identify similar vulnerabilities. Security teams should also review and strengthen their incident response procedures to address potential compromise of authentication systems, as this vulnerability represents a sophisticated attack vector that may not be immediately apparent through standard security monitoring.