CVE-2002-2276 in Ultimate PHP Board UPB
Summary
by MITRE
Ultimate PHP Board (UPB) 1.0 allows remote attackers to view the physical path of the message board via a direct request to add.php, which leaks the path in an error message.
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Analysis
by VulDB Data Team • 08/29/2025
The vulnerability identified as CVE-2002-2276 affects Ultimate PHP Board version 1.0, a web-based message board application that was widely used in the early 2000s for community forums and discussion platforms. This particular flaw represents a classic information disclosure vulnerability that exposes critical system details to remote attackers without requiring authentication or privileged access. The vulnerability specifically manifests when attackers submit a direct request to the add.php script within the application's directory structure, triggering an error response that inadvertently reveals the physical file path of the installation on the web server.
The technical mechanism behind this vulnerability involves improper error handling within the add.php script of the UPB application. When the script processes certain input parameters or encounters unexpected conditions during execution, it generates an error message that includes the absolute file path of the application's installation directory. This occurs because the application fails to sanitize or properly handle error conditions, allowing the underlying system path to be exposed in the HTTP response sent back to the client. The vulnerability is classified under CWE-209, which specifically addresses "Information Exposure Through an Error Message," and represents a fundamental flaw in input validation and error management practices. This type of error handling weakness creates a pathway for attackers to gain insights into the server's file structure and potentially identify other vulnerabilities within the system.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with crucial reconnaissance data that can be leveraged for more sophisticated attacks. The leaked physical path can reveal the directory structure, which may help attackers identify other potentially vulnerable files or directories within the same server environment. Additionally, this information can be used to craft targeted attacks against the specific server configuration, potentially leading to further exploitation opportunities such as directory traversal attacks or local file inclusion vulnerabilities. The vulnerability demonstrates a significant weakness in the application's security design and reflects poor defensive programming practices that were common in web applications of that era. According to ATT&CK framework, this vulnerability maps to T1212, "Exploitation for Credential Access," as the leaked path information can facilitate credential theft through subsequent exploitation attempts, and T1083, "File and Directory Discovery," as it directly reveals the file system structure.
The mitigation strategies for this vulnerability are straightforward but require immediate implementation to prevent exploitation. The primary fix involves modifying the application's error handling mechanism to prevent the exposure of system paths in error messages, which can be achieved by implementing proper error sanitization and using generic error messages that do not contain sensitive information. Organizations should also implement input validation controls to ensure that all parameters passed to the add.php script are properly validated and sanitized before processing. Additionally, the application should be configured to log errors to system logs rather than displaying them directly to users, and administrators should regularly audit their applications for similar error handling flaws. The vulnerability underscores the importance of following secure coding practices and implementing proper error management as outlined in industry standards such as the OWASP Secure Coding Practices and the CERT Secure Coding Standards. Given the age of this vulnerability and the widespread use of UPB in that era, this flaw likely affected numerous web applications and served as a learning example for developers about the importance of secure error handling practices in web applications.