CVE-2020-5587 in Garoon
Summary
by MITRE
Cybozu Garoon 4.0.0 to 5.0.1 allow remote authenticated attackers to obtain unintended information via unspecified vectors.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 06/30/2020
The vulnerability identified as CVE-2020-5587 affects Cybozu Garoon versions 4.0.0 through 5.0.1, representing a critical information disclosure flaw that enables remote authenticated attackers to access unintended data. This vulnerability resides within the access control mechanisms of the Garoon collaboration platform, which is widely used for enterprise document management and workflow automation. The unspecified vectors suggest that the flaw manifests through multiple potential attack paths within the application's permission system, making it particularly concerning for organizations relying on this platform for sensitive business operations. The vulnerability affects the core functionality of the system by allowing attackers who have already established authentication credentials to escalate their privileges and access data they should not be authorized to view.
The technical implementation of this vulnerability stems from inadequate input validation and insufficient access control checks within the application's data retrieval processes. Attackers can exploit this weakness by crafting specific requests that bypass normal authorization checks, potentially gaining access to confidential documents, user information, or administrative data that should remain restricted. The flaw likely exists in the application's API endpoints or internal data handling mechanisms where proper authentication state verification is not consistently enforced. This type of vulnerability aligns with CWE-284, which describes improper access control issues, and represents a significant deviation from the principle of least privilege that should govern all enterprise collaboration systems. The vulnerability's impact is amplified because it requires only authentication credentials rather than additional exploitation techniques, making it accessible to attackers who have gained initial access through other means such as credential theft or social engineering.
From an operational standpoint, the implications of CVE-2020-5587 are severe for organizations using Cybozu Garoon, as it can lead to unauthorized data exposure that may include proprietary business information, customer data, or internal communications. The vulnerability creates a persistent risk that can be exploited over time, potentially allowing attackers to gather intelligence about organizational structures, business processes, and sensitive operational details. Organizations may face regulatory compliance violations, legal consequences, and reputational damage if sensitive information is compromised through this vulnerability. The attack vector's remote nature means that exploitation can occur from anywhere on the internet, while the authenticated requirement limits the vulnerability to cases where attackers have already gained some level of access to the system, potentially through credential compromise or other initial attack vectors. This vulnerability directly impacts the confidentiality aspect of the CIA triad and can contribute to broader security incidents when combined with other exploitation techniques.
Organizations should immediately implement mitigations including upgrading to versions of Cybozu Garoon that have addressed this vulnerability, typically versions beyond 5.0.1. Security teams should conduct comprehensive access control reviews to identify any potential unauthorized data access that may have occurred prior to patching. Network segmentation and monitoring of API access patterns can help detect anomalous behavior that might indicate exploitation attempts. Additionally, organizations should implement strict audit logging for all data access operations and regularly review access permissions to ensure that users only have access to data necessary for their roles. The vulnerability demonstrates the importance of maintaining up-to-date software and implementing robust access control mechanisms, aligning with ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting. Regular security assessments and penetration testing should be conducted to identify similar access control weaknesses in other enterprise applications and systems.