CVE-2000-0098 in Index Server
Summary
by MITRE
Microsoft Index Server allows remote attackers to determine the real path for a web directory via a request to an Internet Data Query file that does not exist.
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Analysis
by VulDB Data Team • 04/20/2026
Microsoft Index Server vulnerability CVE-2000-0098 represents a path disclosure issue that occurs when the system processes requests for non-existent Internet Data Query files. This flaw exists within the web server component of Index Server, which is designed to provide search capabilities for web content. When an attacker submits a request for a non-existent .idq file, the server responds with error information that inadvertently reveals the actual physical path of the web directory structure. This behavior stems from insufficient input validation and error handling mechanisms within the Index Server's web processing module.
The technical exploitation of this vulnerability follows a straightforward pattern where attackers can craft malicious requests targeting non-existent files within the web server's directory structure. The server's response includes detailed path information that can be extracted from error messages, effectively leaking system internals to unauthorized parties. This path disclosure vulnerability falls under the CWE-209 category of "Information Exposure Through an Error Message" and can be categorized under ATT&CK technique T1083 for "File and Directory Discovery." The flaw essentially transforms a simple file access attempt into a reconnaissance tool for attackers seeking to understand the underlying system architecture.
The operational impact of CVE-2000-0098 extends beyond simple information disclosure, as the leaked path information provides attackers with critical system topology knowledge. This information can be leveraged for subsequent attacks including directory traversal exploits, privilege escalation attempts, or targeted attacks against specific system components. The vulnerability creates a foothold for attackers to map the web server's physical directory structure, potentially revealing sensitive file locations, configuration files, or application-specific directories. Security professionals should note that this issue demonstrates the importance of proper error handling in web applications, as the system's response to invalid requests inadvertently provides useful reconnaissance data to threat actors.
Mitigation strategies for this vulnerability involve implementing proper input validation and error handling procedures within the Index Server configuration. System administrators should configure the web server to suppress detailed error messages and avoid exposing system path information in server responses. The recommended approach includes modifying the server configuration to return generic error messages instead of specific path information when processing requests for non-existent files. Additionally, implementing proper access controls and restricting direct access to sensitive system directories can reduce the impact of such information disclosure. Organizations should also consider upgrading to newer versions of Microsoft Index Server or migrating to more modern search and indexing solutions that address these legacy security concerns. The vulnerability highlights the critical need for comprehensive security testing and proper error handling implementation across all web server components, aligning with industry best practices outlined in security frameworks such as the OWASP Top Ten and NIST cybersecurity guidelines.