CVE-2004-1386 in TikiWiki
Summary
by MITRE
TikiWiki before 1.8.4.1 does not properly verify uploaded images, which could allow remote attackers to upload and execute arbitrary PHP scripts, a different vulnerability than CVE-2005-0200.
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Analysis
by VulDB Data Team • 06/30/2021
The vulnerability described in CVE-2004-1386 represents a critical security flaw in TikiWiki versions prior to 1.8.4.1 that stems from inadequate input validation during file upload operations. This weakness allows remote attackers to bypass security measures designed to restrict file uploads to only safe file types, creating a pathway for malicious code execution. The flaw specifically affects the image upload functionality where the application fails to properly validate file extensions and content, enabling attackers to upload PHP scripts disguised as image files. This vulnerability operates under the broader category of insecure file upload mechanisms that have been consistently identified as high-risk security issues across web applications. The issue is particularly concerning because it allows for arbitrary code execution, which can lead to complete system compromise and unauthorized access to sensitive data. According to CWE classification, this vulnerability maps to CWE-434 which describes the improper restriction of uploads to a restricted directory, while also aligning with ATT&CK technique T1190 which covers exploit public-facing application vulnerabilities. The vulnerability exists in the application's trust model where it assumes that uploaded files conform to expected formats without proper validation checks.
The technical implementation of this vulnerability occurs when TikiWiki processes file uploads without adequately verifying the actual file type or content. Attackers can exploit this by uploading a file with a PHP extension but with image file headers, effectively tricking the application into treating the malicious code as an image file. The application's file validation logic fails to perform thorough content inspection, relying instead on superficial extension checks that can be easily circumvented. This allows PHP scripts to be executed within the web server context, providing attackers with the ability to run arbitrary commands on the server. The vulnerability demonstrates a classic case of insufficient input sanitization where the application fails to implement proper file type detection mechanisms. The flaw is particularly dangerous because it can be exploited remotely without requiring authentication, making it a significant threat to web application security. The vulnerability's impact is amplified by the fact that it affects the core functionality of TikiWiki, which is designed to be a comprehensive content management system with user-generated content capabilities.
The operational impact of CVE-2004-1386 extends beyond simple code execution to encompass complete system compromise and data breaches. Once an attacker successfully uploads and executes malicious PHP code, they can gain persistent access to the web server, potentially leading to data theft, system manipulation, or use of the compromised server for further attacks. The vulnerability creates a backdoor that can be used to maintain access to the system long after the initial exploit, making it particularly dangerous for organizations relying on TikiWiki for content management. The risk is compounded by the fact that such vulnerabilities often remain undetected for extended periods, allowing attackers to establish persistent footholds within network environments. Organizations using vulnerable versions of TikiWiki face significant exposure to cyber attacks that can result in regulatory compliance violations, financial losses, and reputational damage. The vulnerability also poses risks to other systems within the same network if the compromised server is not properly isolated, potentially enabling lateral movement and escalation of privileges.
Mitigation strategies for CVE-2004-1386 require immediate implementation of proper file validation and sanitization measures. Organizations should upgrade to TikiWiki version 1.8.4.1 or later where the vulnerability has been addressed through improved file upload validation. The recommended approach involves implementing multiple layers of file validation including content type checking, file extension restrictions, and thorough file header analysis. Security measures should include configuring web servers to prevent execution of PHP files in upload directories, implementing proper file permissions, and conducting regular security audits. Additional protective measures include deploying web application firewalls to monitor and filter suspicious file upload attempts, implementing file integrity monitoring systems, and establishing secure coding practices for file handling operations. The fix should incorporate proper input validation that examines both file extensions and actual file content, ensuring that uploaded files match their declared types. Organizations should also implement network segmentation and access controls to limit the potential damage from successful exploitation attempts, while maintaining comprehensive logging and monitoring capabilities to detect suspicious activities. Regular security updates and patch management procedures are essential to prevent similar vulnerabilities from being exploited in the future.