CVE-2004-2009 in Nukejokes
Summary
by MITRE
NukeJokes 1.7 and 2 Beta allows remote attackers to obtain the full path of the server via (1) a direct call to mainfunctions.php, (2) an invalid jokeid parameter in a JokeView function or (3) an invalid cat parameter in a CatView function, which reveals the path in a PHP error message.
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Analysis
by VulDB Data Team • 07/06/2017
The vulnerability identified as CVE-2004-2009 affects NukeJokes versions 1.7 and 2 Beta, representing a critical information disclosure flaw that exposes sensitive server path information to remote attackers. This vulnerability falls under the CWE-200 category of "Information Exposure" and demonstrates poor error handling practices in web applications. The flaw manifests when users interact with specific functions within the application's codebase, particularly through direct calls to mainfunctions.php or when invalid parameters are passed to the JokeView and CatView functions. The exposure occurs because the application fails to properly sanitize or validate input parameters before processing them, leading to PHP error messages that inadvertently reveal the complete server path structure.
The technical exploitation of this vulnerability requires minimal effort from attackers, as they only need to craft specific requests to trigger the error conditions. When an attacker sends a request with an invalid jokeid parameter to the JokeView function, or an invalid cat parameter to the CatView function, the application's error handling mechanism generates PHP error messages that contain the full server path. This path disclosure represents a significant security risk because it provides attackers with crucial information about the server's file structure, which can be leveraged for further exploitation attempts. The vulnerability directly relates to ATT&CK technique T1083 (File and Directory Discovery) as it enables adversaries to gather system information that would otherwise be protected from casual access.
The operational impact of this vulnerability extends beyond simple path disclosure, as it creates a foundation for more sophisticated attacks. Attackers can use the revealed server paths to plan targeted attacks against specific files or directories, potentially leading to arbitrary code execution, data theft, or system compromise. The exposure of the full path also aids in bypassing certain security measures that rely on path obfuscation, making the application more vulnerable to exploitation. This vulnerability particularly affects web applications built on PHP frameworks where improper error handling can lead to information leakage, and it represents a classic example of how insufficient input validation can create security holes. The issue demonstrates the importance of implementing proper error handling mechanisms that do not expose sensitive system information to end users or attackers.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and error handling practices throughout the application. The recommended approach involves sanitizing all user inputs before processing them within the application, particularly parameters that are passed to functions like JokeView and CatView. Developers should implement custom error handling routines that suppress detailed error messages and instead provide generic responses to users while logging detailed errors for administrative purposes. The application should also be configured to disable PHP error display in production environments and implement proper access controls to prevent direct access to internal functions. Additionally, regular security audits and code reviews should be conducted to identify similar vulnerabilities, and the application should be updated to versions that address this specific flaw. Organizations should also consider implementing web application firewalls that can detect and block suspicious parameter patterns that may trigger such information disclosure vulnerabilities.