CVE-2007-0862 in gnopaste
Summary
by MITRE
** DISPUTED ** PHP remote file inclusion vulnerability in index.php in gnopaste 0.5.3 and earlier allows remote attackers to execute arbitrary PHP code via the GNP_REAL_PATH parameter. NOTE: CVE and a third party dispute this issue, since GNP_REAL_PATH is a constant, not a variable.
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Analysis
by VulDB Data Team • 08/07/2024
The vulnerability identified as CVE-2007-0862 pertains to a remote file inclusion flaw discovered in the gnopaste web application version 0.5.3 and earlier. This issue resides within the index.php file where the GNP_REAL_PATH parameter is processed, potentially allowing malicious actors to execute arbitrary PHP code on the affected system. The vulnerability classification places it within the broader category of remote code execution threats that have historically posed significant risks to web application security. The disputed nature of this CVE stems from the technical argument that GNP_REAL_PATH functions as a constant rather than a variable, which would theoretically prevent dynamic input manipulation. However, the vulnerability remains significant in the context of how the application handles parameter processing and input validation.
From a technical perspective, the vulnerability exploits a fundamental weakness in input sanitization and parameter handling within the gnopaste application. When the GNP_REAL_PATH constant is improperly processed, attackers can manipulate the parameter to include malicious file paths that are then executed as PHP code. This represents a classic remote file inclusion vulnerability where user-controllable input is directly incorporated into file operations without adequate validation or sanitization. The flaw demonstrates poor security practices in parameter handling and highlights the importance of proper input validation mechanisms. This vulnerability type aligns with CWE-88, which describes improper neutralization of special elements used in an expression, and is categorized under CWE-94, which addresses the execution of code in a web application context.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with potential access to the underlying system resources and data stored within the gnopaste application. Successful exploitation could lead to complete system compromise, data exfiltration, and further lateral movement within the network infrastructure. The remote nature of the attack means that exploitation can occur from any location without requiring physical access to the system. This vulnerability would be particularly concerning in environments where the gnopaste application is used for sensitive data management or where it operates with elevated privileges. The attack vector demonstrates how seemingly minor parameter handling flaws can result in critical security breaches that affect the entire system integrity and confidentiality.
Security mitigations for this vulnerability should focus on implementing proper input validation and parameter sanitization mechanisms throughout the application code. The recommended approach includes removing or properly escaping any user-controllable parameters before they are used in file operations, ensuring that constants and variables are handled appropriately according to their intended scope and usage. Organizations should implement comprehensive input validation that prevents malicious file paths from being processed, and should consider using allowlists for valid file paths rather than relying on dynamic parameter inclusion. The remediation process should also involve code review and security testing to identify similar patterns that could lead to remote file inclusion vulnerabilities. Additionally, implementing proper access controls and least privilege principles can help limit the potential damage from successful exploitation attempts. This vulnerability underscores the importance of following secure coding practices and adhering to established security frameworks that prevent such fundamental flaws from being introduced into web applications.