CVE-2006-6347 in Tft Gallery
Summary
by MITRE
Unrestricted file upload vulnerability in TFT-Gallery allows remote authenticated administrators to upload arbitrary .php files, possibly using admin/index.php. NOTE: this can be leveraged with CVE-2006-1412 to create a remote unauthenticated vector.
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Analysis
by VulDB Data Team • 10/04/2017
The vulnerability described in CVE-2006-6347 represents a critical unrestricted file upload flaw within the TFT-Gallery web application that fundamentally undermines the security posture of affected systems. This vulnerability specifically targets authenticated administrator accounts and allows them to bypass normal file upload restrictions through the admin/index.php interface. The flaw stems from insufficient input validation and sanitization mechanisms that fail to properly verify the file types being uploaded, creating an avenue for malicious actors to execute arbitrary code on the target server. The vulnerability operates at the application layer and directly violates security principles that mandate strict file type validation and content inspection before processing user-uploaded files.
The technical implementation of this vulnerability exposes a dangerous privilege escalation path where authenticated users can leverage their administrative credentials to upload malicious php files that execute with the privileges of the web application. This creates a persistent backdoor that can be used to establish command and control capabilities, exfiltrate sensitive data, or further compromise the underlying infrastructure. The vulnerability's impact extends beyond immediate code execution through the use of the admin/index.php endpoint, which serves as a legitimate administrative interface that should not be bypassed by malicious file uploads. This flaw operates under CWE-434 which specifically addresses the weakness of unrestricted file upload, where applications fail to restrict or validate file types, allowing potentially malicious files to be uploaded and executed. The vulnerability's exploitation aligns with attack patterns described in the ATT&CK framework under the T1190 technique for Exploit Public-Facing Application, where adversaries target web applications to gain initial access.
The operational impact of CVE-2006-6347 is severe and potentially devastating for organizations running affected TFT-Gallery installations. Once exploited, the vulnerability can enable attackers to establish persistent access to the web server, potentially leading to full system compromise and data breaches. The vulnerability's chaining potential with CVE-2006-1412 creates an even more dangerous scenario where unauthenticated attackers can leverage the file upload capability to gain remote code execution without requiring valid administrative credentials. This combination of vulnerabilities demonstrates how seemingly isolated flaws can create cascading security risks that significantly expand the attack surface. The vulnerability affects not just the immediate application but can serve as a foothold for broader network infiltration, making it particularly dangerous in enterprise environments where web applications often serve as entry points to larger infrastructures.
Organizations should immediately implement comprehensive mitigations including input validation controls, file type restrictions, and proper access controls to address this vulnerability. The most effective immediate response involves implementing strict file extension and content validation that prevents php and other potentially dangerous file types from being uploaded. Additionally, the web application should be configured to store uploaded files outside the web root directory and implement proper file permission controls to prevent execution of uploaded content. Security teams should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious file upload activities. The remediation strategy should align with industry best practices such as those outlined in the OWASP Top Ten and the NIST Cybersecurity Framework, emphasizing the importance of secure coding practices and regular security assessments. Organizations must also ensure that administrative interfaces like admin/index.php are properly secured with strong authentication mechanisms and access controls to prevent unauthorized access to critical administrative functions. The vulnerability underscores the critical importance of defense in depth strategies and proper security configuration management to prevent such fundamental flaws from being exploited in production environments.