CVE-2000-0951 in IIS
Summary
by MITRE
A misconfiguration in IIS 5.0 with Index Server enabled and the Index property set allows remote attackers to list directories in the web root via a Web Distributed Authoring and Versioning (WebDAV) search.
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Analysis
by VulDB Data Team • 10/12/2025
The vulnerability described in CVE-2000-0951 represents a critical misconfiguration issue within Microsoft Internet Information Services version 5.0 that leverages the Index Server component to expose sensitive directory structures. This weakness arises when the Index Server feature is enabled alongside the Index property configuration, creating an unintended information disclosure channel that remote attackers can exploit through the Web Distributed Authoring and Versioning protocol. The flaw specifically targets the interaction between IIS 5.0's web server functionality and its indexing capabilities, demonstrating how seemingly legitimate features can become security risks when improperly configured.
The technical mechanism behind this vulnerability involves the WebDAV search functionality which is designed to allow remote users to perform operations on web resources. When Index Server is enabled with the Index property set, it creates a search interface that inadvertently reveals directory listings from the web root directory. Attackers can craft specific WebDAV requests that trigger the indexing engine to return directory structures, effectively bypassing normal access controls and exposing the file system hierarchy of the web server. This misconfiguration essentially transforms the indexing service from a legitimate search tool into an information disclosure mechanism that reveals the underlying directory structure to unauthorized users.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with crucial reconnaissance data that can be used for subsequent attacks. The directory listing exposure can reveal sensitive file paths, application structures, and potentially even configuration files that might contain authentication credentials or other sensitive information. This vulnerability aligns with CWE-200, which addresses information exposure through improper information gathering, and represents a classic example of how weak configuration management can create security holes. The attack vector is particularly concerning because it requires minimal privileges and can be executed remotely, making it an attractive target for automated scanning tools.
Organizations running IIS 5.0 with Index Server enabled face significant risk from this vulnerability, as the information disclosure can facilitate more sophisticated attacks including directory traversal, file inclusion, and potentially privilege escalation attempts. The vulnerability demonstrates the importance of proper security configuration management and the principle of least privilege in web server deployments. From an ATT&CK framework perspective, this weakness maps to T1083 (File and Directory Discovery) and T1592 (Gather Victim Host Information) as attackers can systematically enumerate the target's file system structure. The vulnerability also highlights the need for regular security audits and proper configuration reviews to prevent such misconfigurations from persisting in production environments.
Mitigation strategies for CVE-2000-0951 should focus on disabling unnecessary services and properly configuring the Index Server component. Organizations should disable Index Server functionality when it is not required for legitimate business purposes, as this removes the attack surface entirely. Additionally, implementing proper access controls and restrictions on WebDAV operations can limit the exposure of directory listings. Network segmentation and firewall rules can further reduce the impact by limiting access to the affected web server from untrusted networks. The vulnerability serves as a reminder that even well-established web server platforms require careful configuration management and regular security assessments to prevent configuration drift that can introduce exploitable weaknesses.