CVE-1999-0854 in Ultimate Bulletin Board
Summary
by MITRE
Ultimate Bulletin Board stores data files in the cgi-bin directory, allowing remote attackers to view the data if an error occurs when the HTTP server attempts to execute the file.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability identified as CVE-1999-0854 represents a critical misconfiguration issue within the Ultimate Bulletin Board software that exposes sensitive data through improper file handling mechanisms. This flaw exists in the software's implementation where data files are stored within the cgi-bin directory structure, creating an unintended access vector for remote attackers. The vulnerability specifically manifests when the web server encounters errors during the execution of files within this directory, allowing unauthorized users to retrieve data that should remain protected. This represents a fundamental breakdown in the application's security model and demonstrates poor separation between executable code and sensitive data storage.
The technical root cause of this vulnerability stems from the improper placement of data files within the cgi-bin directory, which is typically designated for executable scripts and programs. When the web server attempts to process these files and encounters execution errors, the server configuration allows the raw data content to be served to the requesting client instead of properly handling the error condition. This behavior creates a direct information disclosure vulnerability where attackers can access sensitive data that should be protected through proper access controls and file permissions. The flaw operates at the server configuration level rather than application logic, making it particularly dangerous as it affects the fundamental file serving mechanisms of the web server.
The operational impact of this vulnerability is significant as it allows remote attackers to directly access and retrieve sensitive data from the bulletin board system without requiring authentication or specialized privileges. This exposure can lead to the disclosure of user information, forum data, configuration details, and potentially system credentials that may be stored within these files. The vulnerability affects any system running Ultimate Bulletin Board where the data files are improperly placed in the cgi-bin directory, making it a widespread issue across installations that have not properly configured their file storage. Attackers can exploit this vulnerability through simple web requests that trigger the error condition, making the attack surface extremely broad and accessible.
Mitigation strategies for CVE-1999-0854 focus on proper file organization and server configuration to prevent data exposure through error conditions. The primary solution involves moving data files outside of the cgi-bin directory structure to ensure that these files cannot be executed or directly accessed through web requests. System administrators should implement proper file permissions and access controls that prevent unauthorized access to sensitive data files while maintaining appropriate execution permissions for legitimate CGI scripts. Additionally, web server configurations should be reviewed to ensure that error handling is properly implemented to prevent raw data disclosure even when execution errors occur. This vulnerability aligns with CWE-22, which addresses improper limitation of a pathname to a restricted directory, and represents a classic example of insufficient access control that enables information disclosure attacks. The mitigation approach should follow ATT&CK technique T1213.002 for credential access through data from information repositories, emphasizing the importance of proper data isolation and access control mechanisms.