CVE-2006-6887 in UNU
Summary
by MITRE
Unrestricted file upload vulnerability in logahead UNU 1.0 allows remote attackers to upload and execute arbitrary PHP code via unspecified vectors related to plugins/widged/_widged.php (aka the WidgEd plugin), a different vulnerability than CVE-2006-6783. NOTE: The provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 08/13/2018
The CVE-2006-6887 vulnerability represents a critical unrestricted file upload flaw in the logahead UNU 1.0 content management system that enables remote attackers to execute arbitrary PHP code on affected systems. This vulnerability specifically targets the plugins/widged/_widged.php component, which is part of the WidgEd plugin architecture within the application. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly restrict file types or content during the upload process, creating a pathway for malicious actors to bypass security controls and deploy harmful code.
The technical nature of this vulnerability aligns with CWE-434, which describes the weakness of unrestricted upload of file with dangerous type. The vulnerability exists because the application does not implement proper file type checking or content validation when processing uploaded files through the WidgEd plugin interface. Attackers can exploit this by uploading malicious PHP files that contain executable code, which then gets processed and executed by the web server when accessed through the vulnerable plugin endpoint. This creates a persistent backdoor or command execution capability that can be leveraged for further compromise of the affected system.
From an operational impact perspective, this vulnerability poses significant risks to organizations using the logahead UNU 1.0 platform, as it allows for complete system compromise without requiring authentication. The remote execution capability means attackers can establish persistent access, escalate privileges, and potentially use the compromised system as a launch point for attacking other network resources. The vulnerability's classification as a remote code execution flaw places it within the ATT&CK framework under the T1059.007 technique for Command and Scripting Interpreter, and T1078.004 for Valid Accounts, as attackers can leverage the compromised system to maintain access and expand their operational capabilities. The fact that this vulnerability exists in a plugin component also suggests potential for widespread impact across multiple installations that utilize the same plugin architecture.
Mitigation strategies for this vulnerability should prioritize immediate remediation through official security patches provided by the software vendor, as the vulnerability has been identified in an older version of the application. Organizations should implement network-level restrictions to prevent access to the vulnerable plugin endpoint and consider implementing web application firewalls that can detect and block malicious file upload attempts. Additional defensive measures include restricting file upload permissions, implementing strict file type validation, and conducting thorough code reviews to identify similar vulnerabilities in other plugin components. The vulnerability's nature also suggests that organizations should adopt comprehensive security monitoring to detect unauthorized file uploads and execution activities. Furthermore, implementing proper access controls and authentication mechanisms can help limit the impact of such vulnerabilities, while regular security assessments can help identify and remediate similar issues in other components of the application stack. The vulnerability serves as a reminder of the critical importance of input validation and secure file handling practices in web applications, particularly when dealing with user-supplied content through plugin architectures.