CVE-2017-2116 in Office
Summary
by MITRE
Cybozu Office 10.0.0 to 10.5.0 allows remote authenticated attackers to bypass access restriction to delete "customapp" templates via unspecified vectors.
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Analysis
by VulDB Data Team • 12/22/2020
The vulnerability identified as CVE-2017-2116 represents a critical access control flaw within Cybozu Office versions 10.0.0 through 10.5.0 that enables authenticated attackers to circumvent security restrictions and delete custom application templates. This issue falls under the category of improper access control as defined by CWE-284, where the system fails to properly enforce authorization mechanisms for sensitive operations. The vulnerability specifically targets the deletion functionality of custom application templates, which are essential components for extending the platform's capabilities and customizing user experiences. Attackers who have authenticated access to the system can exploit this weakness to remove critical template files, potentially disrupting business processes and compromising the integrity of custom applications built on the platform.
The technical implementation of this vulnerability stems from insufficient validation of user permissions during template deletion operations. When authenticated users attempt to delete custom application templates, the system does not adequately verify whether the user possesses the necessary administrative privileges or ownership rights to perform such destructive actions. This oversight creates a path for privilege escalation and unauthorized modification of system components that should be protected from deletion by standard users. The unspecified vectors mentioned in the description suggest that the vulnerability may be exploitable through multiple attack surfaces within the application's template management system, making it particularly challenging to fully mitigate without comprehensive analysis of all potential entry points.
The operational impact of this vulnerability extends beyond simple template deletion, as custom application templates often contain critical business logic, user interfaces, and integration components that are essential for organizational workflows. When attackers can delete these templates, they can effectively disrupt service delivery, compromise data integrity, and potentially create denial of service conditions for legitimate users who depend on these custom applications. The vulnerability also poses risks to system stability, as removal of core template files can lead to cascading failures in dependent applications and services. From a compliance perspective, this vulnerability could result in violations of data protection regulations and security standards that require proper access controls and audit trails for system modifications.
Organizations utilizing affected versions of Cybozu Office should immediately implement mitigations including updating to patched versions of the software, implementing additional access controls through network segmentation, and conducting comprehensive security audits of template management configurations. The vulnerability demonstrates the importance of principle of least privilege enforcement and proper authorization checking in enterprise applications. Security teams should also consider implementing monitoring solutions that track template deletion activities and alert on unauthorized modifications to custom application components. This vulnerability aligns with ATT&CK technique T1078 for valid accounts and T1486 for data encryption for ransomware, as unauthorized deletion of critical system components can lead to operational disruption and potential data loss scenarios. The incident underscores the necessity of regular security assessments and patch management processes to prevent exploitation of access control weaknesses in enterprise collaboration platforms.