CVE-1999-1397 in Index Server
Summary
by MITRE
Index Server 2.0 on IIS 4.0 stores physical path information in the ContentIndex\Catalogs subkey of the AllowedPaths registry key, whose permissions allows local and remote users to obtain the physical paths of directories that are being indexed.
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Analysis
by VulDB Data Team • 10/20/2024
This vulnerability exists in Microsoft Index Server 2.0 running on Internet Information Services 4.0 systems, representing a critical information disclosure flaw that exposes sensitive directory structure information to both local and remote attackers. The vulnerability stems from improper access control mechanisms within the Windows registry where the ContentIndex\Catalogs subkey is configured with insufficient permission settings. This registry location stores physical path information for directories that are being indexed by the search service, creating a direct pathway for unauthorized entities to discover the actual file system locations of indexed content.
The technical implementation flaw resides in the registry key permissions configuration where the AllowedPaths registry key lacks proper discretionary access control lists that would normally restrict access to privileged system information. When Index Server 2.0 processes indexing operations, it maintains a catalog of physical paths within the ContentIndex\Catalogs subkey, and these paths are accessible to users who can read the registry entries without proper authentication or authorization checks. This design flaw directly violates the principle of least privilege and creates an information exposure scenario that aligns with CWE-200, which addresses information exposure through improper access control.
The operational impact of this vulnerability extends beyond simple information disclosure as it provides attackers with critical reconnaissance data that can be leveraged for subsequent exploitation attempts. Attackers can use the exposed physical paths to map the directory structure of the web server, identify sensitive directories, and potentially discover additional vulnerabilities within the file system. This information can be used to craft more targeted attacks against specific directories or files, potentially leading to unauthorized access, data exfiltration, or system compromise. The vulnerability affects both local users who have access to the system and remote attackers who can potentially exploit the registry access through network-based attacks, making it particularly dangerous in multi-user or networked environments.
From a cybersecurity framework perspective, this vulnerability maps directly to several ATT&CK techniques including T1083 (File and Directory Discovery) and T1592 (Get Access) where adversaries can use the exposed information to gain deeper access to systems. The vulnerability also represents a failure in the system's defense in depth principles, as it provides attackers with information that should remain protected within the system's internal configuration. Organizations should implement proper registry access controls, restrict permissions on sensitive registry keys, and ensure that indexing services do not expose system information through overly permissive configurations. The recommended mitigations include applying Microsoft security patches, configuring proper access control lists on registry keys, and implementing network segmentation to limit access to systems running Index Server 2.0. Additionally, regular security audits should verify that registry permissions align with security best practices and that indexing services are properly configured to prevent information leakage. This vulnerability demonstrates the critical importance of proper access control implementation in system configuration management and highlights the potential for seemingly benign system features to create significant security risks when not properly secured.