CVE-2020-5583 in Garoon
Summary
by MITRE
Cybozu Garoon 4.0.0 to 5.0.1 allows remote authenticated attackers to bypass access restriction to obtain unauthorized Multi-Report's data via unspecified vectors.
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Analysis
by VulDB Data Team • 06/30/2020
The vulnerability identified as CVE-2020-5583 affects Cybozu Garoon versions 4.0.0 through 5.0.1, representing a critical access control flaw that permits remote authenticated attackers to bypass security restrictions and access unauthorized Multi-Report data. This issue resides within the application's authorization mechanisms, specifically targeting the data access controls that should prevent users from viewing reports they are not authorized to see. The vulnerability manifests through unspecified vectors that likely involve manipulation of access tokens, session identifiers, or API parameters that govern report visibility. Organizations utilizing Garoon for collaborative work environments and document management face significant risks as this flaw could expose sensitive business intelligence, employee data, or confidential organizational information to unauthorized personnel. The impact extends beyond simple data exposure as compromised Multi-Report data could contain financial records, strategic plans, personnel information, or other sensitive business assets that could be exploited for competitive advantage or financial gain.
From a technical perspective, this vulnerability represents a privilege escalation or access control bypass issue that aligns with CWE-285, which specifically addresses improper authorization within software systems. The flaw likely exists in the application's permission checking logic where the system fails to properly validate user credentials or roles when accessing Multi-Report functionality. The authenticated nature of the attack indicates that attackers must first establish valid credentials, typically through legitimate user accounts, before exploiting this vulnerability to access restricted data. This characteristic places the vulnerability in the ATT&CK framework under privilege escalation techniques, specifically targeting the 'Abuse Elevation of Privilege' tactic. The unspecified vectors suggest potential weaknesses in parameter validation, session management, or API endpoint access controls that could be exploited through various manipulation techniques including parameter tampering, session hijacking, or direct API calls that bypass normal access validation routines.
The operational impact of this vulnerability is substantial for organizations relying on Cybozu Garoon for business operations and collaboration. Unauthorized access to Multi-Report data could lead to data breaches, regulatory compliance violations, and potential legal consequences depending on the nature of the exposed information. The vulnerability affects not just individual user privacy but organizational security posture, as it could enable attackers to gather comprehensive intelligence about business operations, employee activities, and organizational structures. Organizations may face reputational damage, financial losses, and increased security audit requirements following exploitation of this vulnerability. The remote nature of the attack means that threat actors can exploit this flaw from anywhere with network access and valid credentials, making it particularly dangerous in environments where network security controls may be insufficient. Additionally, the vulnerability's presence across multiple versions of the software indicates a persistent flaw in the application's design that requires immediate attention and remediation.
Mitigation strategies for CVE-2020-5583 should focus on immediate software updates and patches provided by Cybozu to address the access control bypass issue. Organizations should implement comprehensive access control reviews and validate that all Multi-Report access is properly authenticated and authorized before implementation. Network segmentation and monitoring should be enhanced to detect unusual access patterns to report functionality, particularly when multiple users access different report types simultaneously. Security teams should conduct thorough vulnerability assessments to identify any other potential access control flaws within the Garoon environment and related applications. Additional controls including role-based access controls, regular access reviews, and mandatory access control enforcement should be implemented to reduce the risk of unauthorized data access. Organizations should also consider implementing intrusion detection systems that can identify and alert on suspicious API calls or parameter modifications that might indicate exploitation attempts. The remediation process should include comprehensive testing of access controls to ensure that the patch or update resolves the vulnerability without introducing new security issues, and that all users maintain appropriate access levels according to their roles and responsibilities within the organization.