CVE-2007-4781 in Joomla
Summary
by MITRE
administrator/index.php in the installer component (com_installer) in Joomla! 1.5 Beta1, Beta2, and RC1 allows remote authenticated administrators to upload arbitrary files to tmp/ via the "Upload Package File" functionality, which is accessible when com_installer is the value of the option parameter.
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Analysis
by VulDB Data Team • 10/03/2024
The vulnerability identified as CVE-2007-4781 represents a critical file upload flaw within the Joomla! content management system version 1.5 beta releases. This security weakness exists in the installer component specifically at administrator/index.php, which handles package file uploads through the "Upload Package File" functionality. The vulnerability is particularly concerning because it affects authenticated administrator accounts, meaning that an attacker who has gained administrative privileges can exploit this flaw to upload malicious files to the server's tmp/ directory. The attack vector is triggered when the com_installer component is accessed through the option parameter, making it a direct exploitation pathway for authenticated users with administrative rights.
This vulnerability falls under the category of insecure file upload mechanisms and can be classified as CWE-434, which describes the improper restriction of uploads to a restricted directory. The flaw allows for arbitrary file uploads because the application fails to properly validate file types and implement adequate access controls for the upload functionality. The tmp/ directory serves as a temporary storage location for package installations, but the lack of proper file validation and access restrictions creates an opportunity for attackers to upload malicious executables, scripts, or other harmful files that could compromise the entire system. The vulnerability is particularly dangerous in the context of web application security because it leverages legitimate administrative functionality to achieve unauthorized file system access.
The operational impact of this vulnerability extends beyond simple file upload capabilities and represents a significant privilege escalation risk within the Joomla! environment. When an authenticated administrator accesses the vulnerable functionality, they inadvertently grant attackers the ability to execute arbitrary code on the server by uploading malicious files that can be executed in the context of the web server process. This creates a potential pathway for complete system compromise, allowing attackers to gain persistent access, escalate privileges, or use the compromised system as a launch point for further attacks against network infrastructure. The vulnerability's exploitation is straightforward and requires only an authenticated administrative session, making it particularly dangerous in environments where administrative credentials might be compromised through other means.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, specifically under the T1059.007 technique for command and scripting interpreter, as well as T1505.003 for server-side include. The compromised system could be used to establish persistent backdoors or serve as a command and control channel for further attacks. Mitigation strategies should focus on implementing strict file type validation, enforcing proper access controls on upload directories, and ensuring that administrative sessions are properly secured through multi-factor authentication. Additionally, the vulnerability highlights the importance of secure coding practices and input validation, particularly for administrative functions that handle file operations. Organizations should immediately patch affected Joomla! installations and implement network segmentation to limit the potential impact of such vulnerabilities, while also monitoring for suspicious file uploads in temporary directories as part of their incident response procedures.