CVE-2004-1581 in BlackBoard
Summary
by MITRE
BlackBoard 1.5.1 allows remote attackers to gains sensitive information via a direct request to (1) checkdb.inc.php, (2) admin.inc.php or (3) cp.inc.php, which reveals the path in a PHP error message.
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Analysis
by VulDB Data Team • 06/22/2018
The vulnerability identified as CVE-2004-1581 affects BlackBoard version 1.5.1, a web-based learning management system that was widely used in educational institutions during the early 2000s. This security flaw represents a classic information disclosure vulnerability that occurs when the application fails to properly handle error conditions, specifically in its database connection and administrative components. The vulnerability manifests when remote attackers can directly access three specific PHP files checkdb.inc.php, admin.inc.php, and cp.inc.php, which contain sensitive path information within their error messages.
The technical flaw stems from the application's improper error handling mechanisms within its PHP codebase. When these specific include files encounter errors during execution, they generate PHP error messages that inadvertently expose the absolute file system paths of the server where BlackBoard is installed. This occurs because the application does not implement proper error suppression or custom error handling routines that would prevent sensitive system information from being exposed to remote attackers. The vulnerability directly maps to CWE-209, which describes "Information Exposure Through an Error Message" and is classified under the broader category of information disclosure weaknesses in the CWE taxonomy. This type of vulnerability is particularly dangerous because it provides attackers with critical system information that can be used for further exploitation.
The operational impact of this vulnerability is significant for organizations using BlackBoard 1.5.1, as it allows remote attackers to obtain detailed information about the server's file structure and installation paths. This information can serve as a foundation for more sophisticated attacks, including directory traversal attacks, path traversal vulnerabilities, and potential privilege escalation attempts. Attackers can use the disclosed paths to understand the application's architecture, locate other potentially vulnerable files, and plan more targeted attacks against the system. The vulnerability affects the confidentiality aspect of the CIA triad, as it compromises the system's ability to protect sensitive operational information. From an ATT&CK framework perspective, this vulnerability aligns with the technique T1083 - File and Directory Discovery, as it provides attackers with detailed knowledge of the file system structure, and could potentially lead to T1592 - Vulnerability Scanning, where attackers systematically identify system weaknesses.
The exploitation of this vulnerability requires minimal technical expertise and can be accomplished through simple HTTP requests to the affected PHP files. The disclosed information typically includes the full server path where the application is installed, which can be used to identify the operating system, web server configuration, and potentially other applications running on the same server. This information disclosure creates a dangerous precedent for attackers as it removes the need for extensive reconnaissance and provides them with the exact locations of sensitive files. Organizations should note that this vulnerability was present in a legacy system and represents a common security misconfiguration that was prevalent in web applications of that era, highlighting the importance of proper error handling and security hardening practices in software development.
Mitigation strategies for this vulnerability involve implementing proper error handling within the affected PHP files to prevent the exposure of system paths in error messages. System administrators should ensure that all PHP applications implement custom error handling routines that suppress detailed error information from being displayed to end users or remote attackers. The recommended approach includes configuring PHP to log errors to system logs rather than displaying them on web pages, implementing proper input validation, and ensuring that sensitive system information is not exposed through error messages. Additionally, organizations should consider upgrading to supported versions of BlackBoard, as this vulnerability was likely addressed in subsequent releases. Security best practices dictate that all web applications should follow the principle of least privilege and implement comprehensive error handling that protects sensitive system information while providing adequate feedback for legitimate administrative purposes. The vulnerability also underscores the importance of regular security assessments and code reviews to identify similar information disclosure issues in other applications and systems.