CVE-2019-19616 in Web Time
Summary
by MITRE
An Insecure Direct Object Reference (IDOR) vulnerability in the Xtivia Web Time and Expense (WebTE) interface used for Microsoft Dynamics NAV before 2017 allows an attacker to download arbitrary files by specifying arbitrary values for the recId and filename parameters of the /Home/GetAttachment function.
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Analysis
by VulDB Data Team • 03/07/2024
The CVE-2019-19616 vulnerability represents a critical Insecure Direct Object Reference flaw within the Xtivia Web Time and Expense interface for Microsoft Dynamics NAV prior to 2017. This vulnerability resides in the /Home/GetAttachment function which handles file retrieval operations through direct parameter manipulation. The flaw allows unauthorized access to sensitive data by enabling attackers to bypass normal access controls through manipulation of the recId and filename parameters. This type of vulnerability falls under CWE-284 which specifically addresses inadequate access control mechanisms and represents a fundamental breakdown in the application's authorization model.
The technical implementation of this vulnerability stems from improper input validation and lack of proper access control checks within the WebTE interface. When an attacker submits malicious values for the recId and filename parameters, the application directly uses these inputs to construct file paths without adequate verification of user permissions or object ownership. This creates a path traversal scenario where arbitrary file access becomes possible through simple parameter manipulation. The vulnerability is particularly dangerous because it operates at the application interface level where legitimate business functions are exposed to external manipulation, making it a prime target for attackers seeking to escalate privileges or extract sensitive information.
The operational impact of this vulnerability extends beyond simple unauthorized file access, creating potential for broader system compromise and data exfiltration. Attackers can leverage this flaw to access not only user-specific files but potentially system-level documentation, configuration files, and business-sensitive data stored within the Dynamics NAV environment. The vulnerability directly aligns with ATT&CK technique T1074 which involves data staging through the use of remote access tools or web application vulnerabilities. Organizations using affected versions of Microsoft Dynamics NAV face significant risk of information disclosure, particularly in environments where the system handles confidential financial or operational data.
Mitigation strategies for CVE-2019-19616 should focus on implementing robust access control mechanisms and input validation throughout the application architecture. The primary remediation involves ensuring that all file access operations validate user permissions against the requested objects and implement proper authorization checks before processing any file retrieval requests. Organizations should also implement parameterized queries and input sanitization to prevent malicious parameter manipulation from affecting the underlying file system operations. Additionally, implementing proper logging and monitoring of file access patterns can help detect anomalous behavior indicative of exploitation attempts. The vulnerability demonstrates the critical importance of following secure coding practices and adhering to the principle of least privilege in web application development, particularly when handling file operations and user-specific data access.