CVE-2000-0021 in Domino Server
Summary
by MITRE
Lotus Domino HTTP server allows remote attackers to determine the real path of the server via a request to a non-existent script in /cgi-bin.
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Analysis
by VulDB Data Team • 10/19/2025
The vulnerability described in CVE-2000-0021 affects the Lotus Domino HTTP server implementation and represents a classic information disclosure flaw that can be exploited by remote attackers to gain knowledge about the underlying server structure. This vulnerability specifically manifests when the server processes requests for non-existent scripts within the /cgi-bin directory, allowing malicious actors to infer the actual file system paths used by the server. The issue stems from the server's inadequate error handling mechanism, which inadvertently reveals path information in its response messages. Such path disclosure can provide attackers with critical reconnaissance data that may be used to plan more sophisticated attacks against the system.
The technical root cause of this vulnerability aligns with CWE-200, which addresses the improper exposure of sensitive information through error messages or diagnostic output. When the Lotus Domino server encounters a request for a non-existent script in the cgi-bin directory, it generates an error response that includes the actual file system path where the server is installed. This occurs because the server's error handling routine does not properly sanitize its output before sending responses to clients. The vulnerability exists in the server's HTTP request processing logic where it fails to implement proper input validation and output filtering for error conditions. Attackers can leverage this by making specific requests to the server and analyzing the responses to determine the physical path structure of the Domino installation, which can then be used to craft more targeted attacks.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with crucial system architecture information that can facilitate further exploitation attempts. Once an attacker has determined the real path of the server, they can use this knowledge to bypass certain security measures, understand the server's file structure, and potentially locate sensitive configuration files or other system resources. This information disclosure can be particularly dangerous when combined with other vulnerabilities, as it allows attackers to craft more precise attacks against specific files or directories within the server's file system. The vulnerability also violates fundamental security principles by exposing internal server details that should remain hidden from external parties. According to ATT&CK framework, this represents a technique categorized under T1083 (File and Directory Discovery) and T1213 (Data from Information Repositories) as attackers can use the disclosed information to gather intelligence about the target system's structure.
The mitigation strategies for this vulnerability involve implementing proper error handling mechanisms that do not reveal sensitive path information in server responses. Organizations should configure their Lotus Domino servers to sanitize error messages and ensure that all responses contain generic error information rather than specific system path details. This can be achieved through server configuration changes that disable detailed error reporting for client requests. System administrators should also implement proper input validation for all HTTP requests and ensure that error handling routines are designed to prevent information leakage. The fix typically involves updating the server software to a patched version that addresses the improper error handling behavior, or implementing configuration changes that modify how the server responds to invalid requests. Additionally, network-level security controls such as firewalls and intrusion detection systems can be configured to monitor for and block suspicious requests that attempt to exploit this vulnerability. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other server components and ensure that the server configuration follows security best practices.