CVE-2016-7832 in Dezie
Summary
by MITRE
Cybozu Dezie 8.0.0 to 8.1.1 allows remote attackers to bypass access restrictions to obtain an arbitrary DBM (Cybozu Dezie proprietary format) file via unspecified vectors.
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Analysis
by VulDB Data Team • 10/15/2019
The vulnerability identified as CVE-2016-7832 affects Cybozu Dezie versions 8.0.0 through 8.1.1, representing a critical access control flaw that enables remote attackers to bypass authentication mechanisms and obtain arbitrary database files in the proprietary DBM format. This issue stems from insufficient input validation and access restriction enforcement within the application's file handling routines, allowing unauthorized parties to exploit unspecified vectors to gain access to sensitive data stored in the system.
The technical flaw manifests as a weakness in the application's authorization framework where proper access controls are not consistently enforced when processing file requests. Attackers can leverage this vulnerability to bypass the normal authentication and authorization checks that should prevent unauthorized access to database files. The DBM format used by Cybozu Dezie is a proprietary database management system that stores application data, making this vulnerability particularly concerning as it could expose sensitive business information, user data, or system configuration details stored within these files.
This vulnerability has significant operational impact on organizations using affected Cybozu Dezie versions, as it creates an avenue for data exfiltration and potential system compromise. The remote nature of the attack means that threat actors do not require physical access to the system or local network presence to exploit this flaw, making it particularly dangerous in environments where such applications are exposed to external networks. The compromise of DBM files could lead to the exposure of confidential information, disruption of business operations, and potential compliance violations depending on the nature of data stored within these proprietary database files.
Organizations should immediately implement mitigations including updating to patched versions of Cybozu Dezie, applying security patches provided by the vendor, and implementing network segmentation to limit access to affected systems. Additional defensive measures such as monitoring for unusual file access patterns, implementing web application firewalls, and conducting regular security assessments can help detect and prevent exploitation attempts. This vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems, and represents a clear violation of the principle of least privilege that should govern all access control mechanisms in enterprise applications. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and credential access tactics, as attackers can leverage it to gain unauthorized access to sensitive data without proper authentication credentials.