CVE-2014-2223 in Plogger
Summary
by MITRE
Unrestricted file upload vulnerability in plog-admin/plog-upload.php in Plogger 1.0 RC1 and earlier allows remote authenticated users to execute arbitrary code by uploading a ZIP file that contains a PHP file and a non-zero length PNG file, then accessing the PHP file via a direct request to it in plog-content/uploads/archive/.
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Analysis
by VulDB Data Team • 04/08/2025
The vulnerability identified as CVE-2014-2223 represents a critical unrestricted file upload flaw within the Plogger content management system version 1.0 RC1 and earlier. This vulnerability exists in the administrative file upload functionality located at plog-admin/plog-upload.php, which fails to properly validate file types and contents during the upload process. The flaw specifically affects authenticated users who possess administrative privileges, making it particularly dangerous as it leverages existing access to execute malicious code within the target system. The vulnerability operates through a sophisticated attack vector that combines multiple file type manipulations to bypass security controls.
The technical exploitation mechanism involves crafting a specially formatted ZIP archive containing both a PHP payload and a non-zero length PNG file. The PNG file serves as a decoy to satisfy the system's basic file type validation checks, while the PHP component provides the actual malicious code execution capability. When the system processes this ZIP file, it extracts the PHP file into the plog-content/uploads/archive/ directory without proper validation of the file's actual content or purpose. This extraction process occurs because the system's file validation logic fails to properly inspect the contents of compressed archives or to enforce strict file type restrictions on extracted files. The vulnerability essentially allows attackers to upload executable code disguised as legitimate media files, creating a persistent backdoor within the web application's file system.
The operational impact of this vulnerability extends far beyond simple code execution, as it provides attackers with complete control over the affected web server and the ability to perform further attacks within the compromised environment. Successful exploitation enables attackers to upload additional malicious payloads, modify existing files, access sensitive data, and potentially escalate privileges to gain deeper system access. The vulnerability creates a persistent threat since the uploaded PHP files remain accessible through direct HTTP requests to the plog-content/uploads/archive/ directory, allowing attackers to maintain access even after initial compromise. This type of vulnerability falls under CWE-434, which specifically addresses unrestricted file upload, and represents a significant risk for web applications that fail to properly validate and sanitize file uploads from authenticated users.
The attack pattern aligns with several techniques documented in the MITRE ATT&CK framework, particularly those related to command and control operations and privilege escalation. Attackers can leverage this vulnerability to establish persistent access points within the web application, potentially using the compromised system as a launchpad for further network reconnaissance and lateral movement. The vulnerability also represents a common weakness in web application security where input validation and file type checking are insufficient to prevent malicious file uploads. Organizations should implement comprehensive file validation mechanisms that check not only file extensions but also file content signatures, enforce strict upload permissions, and maintain proper file access controls. Additionally, regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues in other web applications and content management systems.
The remediation approach for this vulnerability requires immediate patching of the affected Plogger version to implement proper file type validation and content inspection mechanisms. System administrators should ensure that all file uploads undergo strict validation processes that examine both file extensions and actual file content, particularly for compressed archives. The implementation of proper access controls and directory permissions is essential to prevent unauthorized execution of uploaded files. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious file upload activities and potential exploitation attempts. Regular security updates and patch management procedures should be established to prevent similar vulnerabilities from being introduced through outdated software components, as this vulnerability demonstrates the critical importance of maintaining up-to-date security controls in web applications.