CVE-2002-1759 in PHProjekt
Summary
by MITRE
The upload function in PHPProjekt 2.0 through 3.1 does not properly verify certain variables related to uploaded data, which allows remote attackers to cause PHPProjekt to process arbitrary files.
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Analysis
by VulDB Data Team • 09/01/2025
The vulnerability identified as CVE-2002-1759 resides within the file upload functionality of PHPProjekt versions 2.0 through 3.1, representing a critical security flaw that enables remote attackers to execute arbitrary file processing operations. This issue stems from insufficient validation of uploaded file parameters, creating a pathway for malicious actors to bypass intended security controls and manipulate the application's file handling mechanisms. The vulnerability specifically targets the variable verification process during file uploads, where proper input sanitization and validation checks are either missing or inadequately implemented.
The technical exploitation of this vulnerability occurs through manipulation of file upload variables that should normally be restricted to legitimate file types and parameters. Attackers can craft specially formatted upload requests that circumvent the application's intended file type restrictions, allowing them to upload and subsequently process files with arbitrary content. This flaw operates at the application layer and can be leveraged to upload malicious scripts, executables, or other harmful file types that the application would normally reject. The vulnerability is categorized under CWE-20, which represents improper input validation, and aligns with ATT&CK technique T1190 for exploiting vulnerabilities in web applications. The lack of proper validation creates a path for attackers to potentially execute arbitrary code on the target system through the compromised upload functionality.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it can lead to complete system compromise and unauthorized access to sensitive data. Remote attackers can leverage this flaw to upload backdoor scripts or malicious code that persists on the server, potentially enabling long-term unauthorized access to the system. The vulnerability affects the integrity and confidentiality of the application's data handling processes, as attackers can manipulate the system to process files they control rather than legitimate user content. This creates opportunities for data exfiltration, system infiltration, and potential lateral movement within network environments where the vulnerable PHPProjekt instances are deployed.
Mitigation strategies for CVE-2002-1759 require immediate implementation of proper input validation and file type restriction measures within the PHPProjekt application. Organizations should implement strict file extension validation, content type checking, and proper sanitization of all uploaded file parameters to prevent the exploitation of this vulnerability. The recommended approach involves enforcing whitelisting of acceptable file types, implementing proper file name sanitization, and ensuring that uploaded files are stored in non-executable directories. Additionally, access controls should be strengthened to prevent unauthorized upload operations, and the application should be updated to a patched version that addresses the variable verification shortcomings. Security monitoring should be enhanced to detect unusual upload patterns and unauthorized file processing activities that may indicate exploitation attempts. The vulnerability serves as a critical reminder of the importance of proper input validation and secure file handling practices in web applications, with implications that extend to broader application security frameworks and compliance requirements.