CVE-2007-1139 in Simple Plantilla PHP
Summary
by MITRE
Unrestricted file upload vulnerability in Cromosoft Simple Plantilla PHP (SPP) allows remote attackers to upload arbitrary scripts via a filename with a double extension.
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Analysis
by VulDB Data Team • 10/14/2017
The vulnerability identified as CVE-2007-1139 represents a critical unrestricted file upload flaw within Cromosoft Simple Plantilla PHP version 1.0 and earlier. This issue stems from inadequate input validation and sanitization mechanisms that fail to properly inspect file extensions and content, allowing malicious actors to bypass security controls through crafted filename manipulation techniques. The vulnerability specifically exploits the system's inability to properly validate file extensions when processing uploaded content, creating a pathway for attackers to execute arbitrary code on the target server.
The technical implementation of this vulnerability involves a double extension attack vector where an attacker crafts a filename containing two extensions such as .php.jpg or .asp.png. The system processes the file with the first extension, treating it as an image or document, while the actual executable code resides in the second extension. This occurs because many web applications perform basic extension checks but fail to implement comprehensive validation that examines the entire filename or file content. The flaw aligns with CWE-434, which specifically addresses unrestricted upload of file with dangerous type, and represents a classic example of inadequate file validation controls.
The operational impact of this vulnerability is severe and multifaceted, as it enables remote code execution capabilities that can compromise entire web servers. Attackers can upload malicious scripts that execute with the privileges of the web server process, potentially leading to complete system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability can be exploited through various attack vectors including web application interfaces, file upload forms, or API endpoints that accept user-supplied files. This weakness directly maps to tactics in the MITRE ATT&CK framework under T1190 for Exploit Public-Facing Application and T1059 for Command and Scripting Interpreter, making it a particularly dangerous threat to web application security.
Mitigation strategies for this vulnerability require immediate implementation of robust file validation controls that go beyond simple extension checks. Organizations should implement comprehensive file type validation using both whitelisting approaches and content analysis to verify file integrity. The solution involves configuring the web application to reject files with multiple extensions, implementing proper file naming conventions, and establishing strict access controls for uploaded content. Additionally, uploaded files should be stored outside the web root directory and executed only through proper application interfaces. Security measures should include implementing Content Security Policy headers, using secure file upload libraries, and conducting regular security assessments to identify and remediate similar vulnerabilities. The fix typically requires updating the application code to properly validate file extensions, implement proper MIME type checking, and ensure that uploaded files are processed through secure channels that prevent direct execution of user-supplied content.