CVE-2018-12997 in Netflow Analyzer
Summary
by MITRE
Incorrect Access Control in FailOverHelperServlet in Zoho ManageEngine Netflow Analyzer before build 123137, Network Configuration Manager before build 123128, OpManager before build 123148, OpUtils before build 123161, and Firewall Analyzer before build 123147 allows attackers to read certain files on the web server without login by sending a specially crafted request to the server with the operation=copyfile&fileName= substring.
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Analysis
by VulDB Data Team • 03/29/2023
The vulnerability identified as CVE-2018-12997 represents a critical access control flaw affecting multiple Zoho ManageEngine products including Netflow Analyzer, Network Configuration Manager, OpManager, OpUtils, and Firewall Analyzer. This weakness stems from inadequate authorization checks within the FailOverHelperServlet component, which processes file operations through web requests. The vulnerability manifests when attackers exploit a specific request pattern containing the operation=copyfile&fileName= parameters, enabling unauthorized file access without proper authentication. This flaw directly violates the principle of least privilege and demonstrates a fundamental failure in the application's security architecture.
The technical implementation of this vulnerability resides in the FailOverHelperServlet's handling of file copy operations, where the system fails to validate user credentials or session tokens before executing file access commands. Attackers can construct malicious requests that bypass normal authentication mechanisms by leveraging the copyfile operation, which is designed to facilitate legitimate file operations but becomes exploitable when access controls are improperly enforced. The vulnerability is classified as a CWE-285: Improper Authorization, which falls under the broader category of access control weaknesses that allow unauthorized users to perform privileged operations. The flaw essentially creates a backdoor path through which any remote attacker can access sensitive server files, potentially including configuration data, user information, or system artifacts.
From an operational perspective, this vulnerability poses severe risks to organizations using affected Zoho ManageEngine products, as it enables attackers to extract sensitive information from the web server without requiring valid credentials. The impact extends beyond simple information disclosure, as the ability to read arbitrary files could lead to credential exposure, system reconnaissance, and potential further compromise of the affected infrastructure. The vulnerability affects multiple products within the Zoho ecosystem, amplifying the potential attack surface and creating cascading security implications across different network monitoring and management functions. According to ATT&CK framework, this vulnerability maps to T1213: Data from Information Repositories and T1078: Valid Accounts, as attackers can leverage this weakness to access repository data and potentially escalate privileges through information gathering.
Organizations should immediately implement mitigations including applying the latest patches released by Zoho ManageEngine, which address the authorization bypass in the FailOverHelperServlet component. Network segmentation and firewall rules should be configured to restrict access to affected applications, particularly limiting exposure of the vulnerable servlet endpoints to internal networks only. Additionally, implementing web application firewalls and monitoring for suspicious requests containing the operation=copyfile&fileName= parameters can help detect and prevent exploitation attempts. Regular security assessments and penetration testing should be conducted to identify similar authorization flaws in other components of the application stack. The vulnerability underscores the critical importance of proper input validation and authentication enforcement in web applications, particularly for operations that involve file system access or sensitive data retrieval.