CVE-2006-7070 in Etomite
Summary
by MITRE
Unrestricted file upload vulnerability in manager/media/ibrowser/scripts/rfiles.php in Etomite CMS 0.6.1 and earlier allows remote attackers to upload and execute arbitrary files via an nfile[] parameter with a filename that contains a .php extension followed by a valid image extension such as .gif or .jpg, then calling the rename function.
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Analysis
by VulDB Data Team • 07/09/2024
The vulnerability identified as CVE-2006-7070 represents a critical unrestricted file upload flaw within the Etomite Content Management System version 0.6.1 and earlier. This vulnerability exists in the manager/media/ibrowser/scripts/rfiles.php component of the application, which handles file management operations. The flaw stems from insufficient input validation and sanitization of file upload parameters, specifically the nfile[] parameter that controls file naming during upload operations.
The technical implementation of this vulnerability exploits a weak security control mechanism that fails to properly validate file extensions and content types during the upload process. Attackers can craft malicious filenames that contain a .php extension followed by legitimate image extensions such as .gif or .jpg, effectively bypassing typical file type restrictions. This technique leverages the fact that the application does not perform comprehensive validation of the entire filename or content, allowing malicious PHP code to be embedded within what appears to be a legitimate image file. The vulnerability becomes particularly dangerous when combined with the rename function that the attacker can invoke, enabling the execution of the uploaded malicious code.
The operational impact of this vulnerability is severe and multifaceted. Remote attackers can leverage this flaw to upload backdoor scripts, web shells, or other malicious payloads that can then be executed on the target server. This provides attackers with persistent access to the compromised system, enabling them to perform various malicious activities including data exfiltration, privilege escalation, and establishing further footholds within the network. The vulnerability essentially transforms the file upload functionality into a code execution vector, making it a prime target for attackers seeking to compromise entire web applications. The attack chain typically involves uploading a PHP file disguised as an image, then accessing the renamed file through the web server to execute the malicious code.
Security mitigations for this vulnerability should focus on implementing robust input validation and sanitization measures. The most effective approach involves validating file extensions against a strict whitelist of allowed formats, ensuring that no executable extensions are permitted in the upload process. Additionally, server-side content type verification should be implemented to validate that uploaded files match their claimed file types. The application should also employ proper file naming conventions that do not allow attackers to manipulate the file extension during upload operations. Organizations should implement the principle of least privilege by restricting file upload capabilities to authenticated users only and implementing proper access controls. According to CWE standards, this vulnerability maps to CWE-434 which describes the weakness of unrestricted upload of file with dangerous type. The ATT&CK framework categorizes this as a technique for Initial Access through Web Shell or Command and Control, with the vulnerability serving as a critical entry point for adversaries seeking to establish persistent access to compromised systems. Regular security audits and input validation testing should be conducted to prevent similar vulnerabilities from being introduced in future versions of the application.