CVE-2006-4471 in Joomla
Summary
by MITRE
The Admin Upload Image functionality in Joomla! before 1.0.11 allows remote authenticated users to upload files outside of the /images/stories/ directory via unspecified vectors.
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Analysis
by VulDB Data Team • 04/21/2019
The vulnerability described in CVE-2006-4471 represents a critical directory traversal flaw within the Joomla! content management system prior to version 1.0.11. This security weakness specifically affects the administrative image upload functionality, creating a path traversal condition that enables authenticated attackers to bypass intended file storage restrictions. The vulnerability stems from inadequate input validation and improper directory path handling within the upload processing logic, allowing malicious users to manipulate file upload destinations beyond the designated /images/stories/ directory structure.
The technical implementation of this vulnerability involves the exploitation of insufficient sanitization mechanisms in the file upload handler. When administrators or authenticated users attempt to upload images through the admin interface, the system fails to properly validate or restrict the target directory paths. This allows attackers to inject malicious path sequences or directory traversal characters that redirect file storage to arbitrary locations on the server filesystem. The unspecified vectors mentioned in the description suggest that multiple attack methods may exist, potentially including manipulation of file paths through URL parameters, form fields, or other input vectors that are not explicitly detailed in the initial vulnerability report.
From an operational impact perspective, this vulnerability creates severe security implications for Joomla! installations. Attackers who can authenticate to the system with administrative privileges or who have gained access through other means can leverage this flaw to upload malicious files to locations outside the intended image storage directory. This could enable attackers to place backdoors, web shells, or other malicious payloads in critical system directories, potentially leading to complete system compromise. The vulnerability essentially undermines the intended security boundaries of the application's file management system, allowing unauthorized file placement in locations where the application may execute or serve these files.
The security implications extend beyond simple file placement, as this vulnerability aligns with CWE-22 Directory Traversal and represents a classic privilege escalation vector within web applications. According to ATT&CK framework categorization, this vulnerability maps to T1059 Command and Scripting Interpreter and T1505 Server Software Component, as it enables attackers to deploy malicious software components that can execute commands on the server. Organizations running vulnerable versions of Joomla! face significant risk of unauthorized code execution, data exfiltration, and potential lateral movement within their network infrastructure. The vulnerability particularly affects systems where administrative access can be obtained through credential compromise or other attack vectors, as the path traversal capability allows attackers to place files in locations that could be executed by the web server.
Mitigation strategies for this vulnerability include immediate upgrading to Joomla! version 1.0.11 or later, which contains the necessary patches to address the directory traversal issue. Organizations should also implement additional security measures such as restricting file upload permissions, implementing proper input validation for all file upload operations, and monitoring for unauthorized file creation in system directories. Network segmentation and web application firewalls can provide additional layers of protection by monitoring and filtering suspicious file upload patterns. Regular security audits and vulnerability assessments should be conducted to identify similar path traversal vulnerabilities in other components of the application stack, as this type of flaw commonly occurs in web applications that fail to properly validate and sanitize user-supplied input before processing file operations.