CVE-2019-5942 in Garoon
Summary
by MITRE
Cybozu Garoon 4.0.0 to 4.10.1 allows remote authenticated attackers to bypass access restriction to obtain files without access privileges via the Multiple Files Download function of application 'Cabinet'.
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Analysis
by VulDB Data Team • 09/23/2023
The vulnerability identified as CVE-2019-5942 affects Cybozu Garoon versions 4.0.0 through 4.10.1, specifically targeting the Cabinet application's Multiple Files Download function. This represents a critical access control flaw that enables authenticated attackers to circumvent security restrictions and obtain files they would normally not have privileges to access. The issue stems from inadequate input validation and authorization checks within the file download mechanism, creating a pathway for privilege escalation through unauthorized file retrieval.
The technical implementation of this vulnerability resides in the Cabinet application's handling of multiple file download requests where the system fails to properly verify user permissions for each individual file in the download batch. Attackers can construct malicious requests that include file identifiers for resources they should not be able to access, exploiting a flaw in the authorization validation process that occurs at the batch level rather than the individual file level. This misconfiguration allows for the retrieval of sensitive documents, configuration files, or other restricted content through a single authenticated session.
Operationally, this vulnerability poses significant risks to organizations using Cybozu Garoon as their collaboration platform. The impact extends beyond simple unauthorized file access to potential data breaches involving confidential business information, proprietary documents, or personal data. The authenticated nature of the attack means that attackers must first establish a valid user session, but once achieved, they can leverage this privilege to access files across different permission levels within the system. This vulnerability directly violates the principle of least privilege and can lead to information disclosure, intellectual property theft, and compliance violations.
Organizations should implement immediate mitigations including applying the vendor-provided security patches, reviewing and strengthening access control policies, and monitoring for suspicious download activities. The vulnerability aligns with CWE-285 which addresses improper authorization in software systems, and relates to ATT&CK technique T1078 for valid accounts and T1041 for data compression. Additional defensive measures include implementing network segmentation, enforcing strict file access controls, and conducting regular security audits of collaboration platforms. System administrators should also consider implementing automated monitoring solutions that can detect anomalous download patterns and alert security teams to potential exploitation attempts.