CVE-2021-37442 in IVM Attendant
Summary
by MITRE • 07/26/2021
NCH IVM Attendant v5.12 and earlier allows path traversal via viewfile?file=/.. to read files.
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Analysis
by VulDB Data Team • 07/28/2021
The vulnerability identified as CVE-2021-37442 affects NCH IVM Attendant version 5.12 and earlier, representing a critical path traversal flaw that enables unauthorized file access. This issue resides within the web interface of the system, specifically in the viewfile functionality that processes file parameters through the URL query string. The vulnerability manifests when the application fails to properly sanitize user input passed through the file parameter, allowing attackers to manipulate the file path and access files outside the intended directory structure. The exploitation occurs through the URL pattern viewfile?file=/.. which demonstrates how the system processes directory traversal sequences without adequate validation. This flaw directly violates the principle of least privilege and demonstrates a classic security misconfiguration where input validation is insufficient to prevent malicious path manipulation attempts.
The technical implementation of this vulnerability stems from improper input sanitization and inadequate access control mechanisms within the IVM Attendant application. When users provide file paths through the viewfile endpoint, the system should validate that the requested file resides within a designated safe directory and reject any attempts to traverse upward through the directory structure. However, in vulnerable versions, the application accepts arbitrary paths and processes them directly without proper validation, effectively allowing attackers to navigate the file system beyond intended boundaries. This represents a fundamental flaw in the application's security architecture where it fails to implement proper path normalization and access restriction controls. The vulnerability can be categorized under CWE-22 Path Traversal, which specifically addresses the issue of allowing attackers to access files and directories outside the intended scope through manipulation of file paths.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the ability to access sensitive system files, configuration data, and potentially user information that should remain protected. Attackers can leverage this vulnerability to read system files, application configuration files, database files, or other sensitive data that may contain credentials, system settings, or proprietary information. The implications are particularly severe for voice messaging systems where such applications often contain confidential communications, user data, and system configurations that could be exploited for further attacks. This vulnerability creates a persistent security risk that remains active until the underlying code is patched or the system is properly configured to prevent path traversal attacks. The attack surface is significant as it affects any user with access to the web interface, making it a high-impact vulnerability for organizations relying on the affected system.
Mitigation strategies for CVE-2021-37442 should prioritize immediate patching of the affected software to the latest version that addresses the path traversal vulnerability. Organizations should implement comprehensive input validation controls that sanitize all user-supplied data, particularly parameters used in file access operations. The system should enforce strict path validation that prevents traversal sequences from being processed, implementing proper directory traversal detection mechanisms. Security controls should include implementing a whitelist approach for file access, where only pre-approved files can be accessed through the viewfile functionality. Network segmentation and access controls should be strengthened to limit exposure of the vulnerable system to unauthorized users. Additionally, organizations should conduct thorough security testing including penetration testing and vulnerability scanning to identify similar path traversal vulnerabilities in other systems. The remediation process should follow established security frameworks and best practices for vulnerability management, ensuring that the fix properly addresses the root cause rather than merely patching symptoms. This vulnerability highlights the importance of implementing proper security controls early in the software development lifecycle and demonstrates how seemingly simple input validation can have significant security implications.