CVE-2020-5643 in Garoon
Summary
by MITRE • 11/06/2020
Improper input validation vulnerability in Cybozu Garoon 5.0.0 to 5.0.2 allows a remote authenticated attacker to delete some data of the bulletin board via unspecified vector.
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Analysis
by VulDB Data Team • 12/03/2020
The vulnerability identified as CVE-2020-5643 represents a critical improper input validation flaw within Cybozu Garoon versions 5.0.0 through 5.0.2. This security weakness specifically affects the bulletin board functionality of the application, creating a potential pathway for remote authenticated attackers to execute unauthorized data deletion operations. The vulnerability arises from insufficient validation of user inputs when processing requests related to bulletin board data management, allowing malicious actors with legitimate authentication credentials to exploit this gap and remove critical information from the system.
The technical implementation of this vulnerability stems from inadequate sanitization and validation of input parameters within the bulletin board module. When authenticated users submit requests to delete bulletin board entries, the application fails to properly verify the legitimacy of the requested deletion operations. This validation gap enables attackers to manipulate input parameters to target specific data entries beyond their intended scope, potentially compromising the integrity and availability of the bulletin board content. The unspecified vector suggests that the exact method of exploitation may vary based on how the application processes deletion requests internally, making the vulnerability particularly challenging to predict and defend against.
From an operational impact perspective, this vulnerability poses significant risks to organizations relying on Cybozu Garoon for collaborative communications and information sharing. The ability to delete bulletin board data without proper authorization can lead to loss of critical business information, disruption of communication channels, and potential compliance violations. The remote nature of the attack means that threat actors do not require physical access to the system or network, making the vulnerability particularly dangerous in environments where multiple users have legitimate access. Organizations may experience operational downtime while addressing the security breach, and the deletion of important information could impact business continuity and regulatory compliance requirements.
The vulnerability aligns with CWE-20, which describes improper input validation as a fundamental weakness in software applications. This classification emphasizes the importance of validating all external inputs to prevent various injection attacks and unauthorized operations. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and data destruction, as attackers can leverage legitimate authentication to perform unauthorized deletion operations. The threat actor's ability to exploit this weakness without requiring additional privileges makes it particularly dangerous in environments where users have broad access rights to collaboration tools.
Organizations should immediately implement mitigations including applying the latest security patches released by Cybozu to address the input validation gap in the bulletin board functionality. Network segmentation and access controls should be reviewed to limit the scope of potential exploitation, while monitoring systems should be enhanced to detect unusual deletion patterns in bulletin board modules. Regular security assessments and input validation reviews should be conducted to identify similar vulnerabilities in other application components. Additionally, implementing proper logging and audit trails for all bulletin board operations will aid in detecting and responding to unauthorized activities. The vulnerability underscores the critical importance of comprehensive input validation across all application modules and demonstrates how seemingly minor validation gaps can create significant security risks in collaborative environments.