CVE-2020-5565 in Garoon
Summary
by MITRE
Improper input validation vulnerability in Cybozu Garoon 4.0.0 to 4.10.3 allows a remote authenticated attacker to alter the application's data via the applications 'Workflow' and 'MultiReport'.
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Analysis
by VulDB Data Team • 06/03/2024
The vulnerability identified as CVE-2020-5565 represents a critical improper input validation flaw within Cybozu Garoon versions 4.0.0 through 4.10.3. This weakness specifically affects the application's workflow and multi-report functionalities, creating a pathway for remote authenticated attackers to manipulate application data. The vulnerability stems from insufficient validation of user-supplied inputs within these core modules, allowing malicious actors to inject crafted data that bypasses normal security controls. Such flaws typically arise when applications fail to properly sanitize or validate input parameters before processing them, creating opportunities for data manipulation and potential system compromise.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation as a fundamental security weakness where applications fail to validate or sanitize input data properly. This weakness enables attackers to submit malicious input that can alter application behavior or data integrity. In the context of Cybozu Garoon's workflow system, this could permit unauthorized modification of business processes, while the multi-report functionality might allow manipulation of report data or metadata. The authenticated nature of the attack requires an attacker to first establish valid credentials, but once achieved, the privilege escalation potential can be significant given the administrative capabilities these modules typically possess.
The operational impact of CVE-2020-5565 extends beyond simple data corruption, potentially enabling more sophisticated attacks within the application environment. Remote authenticated attackers could leverage this vulnerability to modify workflow approval processes, potentially bypassing critical business controls or creating fraudulent approval paths. The multi-report functionality manipulation could lead to data integrity issues, false reporting, or even information disclosure if the reports contain sensitive organizational data. This vulnerability particularly affects organizations relying on Garoon for business process automation and reporting, where workflow integrity and data accuracy are paramount. The attack vector through authenticated sessions means that compromised user accounts or credential theft could immediately translate into this vulnerability exploitation, making it particularly dangerous in environments where user access controls may not be properly enforced.
Organizations should implement multiple layers of defense to mitigate this vulnerability, beginning with immediate patching of affected Cybozu Garoon versions to the latest available releases. Network segmentation and access control measures should be enforced to limit the potential impact of credential compromise, while implementing strict monitoring of workflow and report modification activities. The ATT&CK framework categorizes this type of vulnerability under T1078 Valid Accounts and T1566 Phishing, as it requires legitimate credentials to exploit but can lead to broader system compromise. Regular security assessments should include validation of input sanitization practices within business applications, particularly those handling workflow automation and reporting functions. Additionally, organizations should consider implementing automated input validation controls and comprehensive logging of all workflow and report modifications to detect potential exploitation attempts and maintain audit trails for forensic analysis.