CVE-2017-14680 in ZKTime Web
Summary
by MITRE
ZKTeco ZKTime Web 2.0.1.12280 allows remote attackers to obtain sensitive employee metadata via a direct request for a PDF document.
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Analysis
by VulDB Data Team • 11/18/2019
The vulnerability identified as CVE-2017-14680 affects ZKTeco ZKTime Web version 2.0.1.12280, a biometric time and attendance management system widely deployed in enterprise environments for employee tracking and access control. This security flaw represents a critical information disclosure vulnerability that exposes sensitive employee metadata to unauthorized remote attackers. The system's web interface fails to properly implement authentication and authorization controls for PDF document requests, creating an avenue for malicious actors to directly access confidential employee data without proper credentials or permissions. The vulnerability stems from inadequate input validation and access control mechanisms within the application's document retrieval functionality, allowing attackers to construct direct HTTP requests to PDF endpoints and obtain employee records including personal identification information, attendance patterns, and other metadata.
The technical implementation of this vulnerability resides in the application's lack of proper access controls for PDF generation and retrieval functions. When users request employee reports in PDF format, the system does not adequately verify whether the requesting entity has appropriate authorization to access the specific employee data. This weakness enables attackers to exploit the application's API endpoints directly, bypassing normal authentication flows and user interface controls. The vulnerability aligns with CWE-284, which describes improper access control, and represents a classic example of insufficient authorization checks in web applications. Attackers can leverage this flaw to obtain comprehensive employee metadata including names, employee IDs, department assignments, work schedules, and attendance records, potentially enabling social engineering attacks, identity theft, or targeted phishing campaigns.
The operational impact of this vulnerability extends beyond simple data exposure, as the compromised information can be used for various malicious activities within corporate environments. Employee metadata obtained through this vulnerability could facilitate insider threat scenarios where adversaries gain insights into workforce patterns, access control behaviors, and organizational structures. The exposure of attendance data and work schedules may enable attackers to plan targeted attacks during specific time periods when employees are present in facilities. Additionally, the compromise of personal employee information creates opportunities for credential stuffing attacks against other systems where employees reuse passwords, and may enable attackers to conduct more sophisticated social engineering operations. This vulnerability particularly affects organizations with strict compliance requirements such as those governed by gdpr, hipaa, or other data protection regulations, where unauthorized disclosure of employee metadata constitutes a significant compliance violation.
Organizations affected by this vulnerability should implement immediate mitigations including mandatory authentication for all PDF document requests, implementation of proper access control checks for each document generation endpoint, and network segmentation to restrict access to the web application interface. Security patches should be applied to update the ZKTime Web application to versions that address the access control flaws, while network administrators should implement web application firewalls to monitor and block suspicious direct requests to PDF endpoints. The mitigation strategy should also include regular security testing of web applications to identify similar authorization bypass vulnerabilities, with particular attention to API endpoints that handle sensitive data retrieval operations. Organizations should conduct comprehensive employee data protection audits to identify and remediate similar issues within their broader IT infrastructure, as this vulnerability demonstrates the critical importance of proper authorization controls in preventing unauthorized data access. The incident highlights the need for security awareness training for developers regarding secure coding practices and proper implementation of access control mechanisms in web applications.