CVE-2012-1125 in Kish Guest Posting plugin
Summary
by MITRE
Unrestricted file upload vulnerability in uploadify/scripts/uploadify.php in the Kish Guest Posting plugin before 1.2 for WordPress allows remote attackers to execute arbitrary code by uploading a file with a PHP extension, then accessing it via a direct request to the file in the directory specified by the folder parameter.
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Analysis
by VulDB Data Team • 06/14/2025
The vulnerability identified as CVE-2012-1125 represents a critical unrestricted file upload flaw within the Kish Guest Posting plugin for WordPress systems. This issue affects versions prior to 1.2 and stems from inadequate input validation mechanisms within the uploadify component that processes file uploads. The vulnerability specifically resides in the uploadify/scripts/uploadify.php script which fails to properly validate file extensions or content types during the upload process, creating a pathway for malicious actors to bypass security controls and deploy malicious payloads.
The technical exploitation of this vulnerability follows a predictable pattern where attackers can upload malicious files with php extensions to the target system. The flaw occurs because the upload process does not adequately verify that uploaded files conform to expected file types or contain malicious code within their content. When attackers upload files with php extensions, they can execute arbitrary code on the web server, effectively gaining remote code execution capabilities. The vulnerability is particularly dangerous because it allows attackers to upload files to directories specified by the folder parameter, providing them with a direct path to execute their payloads through simple http requests to the uploaded files.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and data breach potential. Attackers can leverage this vulnerability to install backdoors, steal sensitive data, modify website content, or use the compromised system as a launch point for further attacks within the network. The vulnerability's exploitation does not require elevated privileges or specific user interactions, making it particularly dangerous for widespread deployment. According to CWE classification, this vulnerability maps to CWE-434 which specifically addresses unrestricted upload of files with dangerous types, and aligns with ATT&CK technique T1190 for Exploit Public-Facing Application, highlighting its potential for lateral movement and persistent access.
Mitigation strategies for this vulnerability require immediate patching of the affected WordPress plugin to version 1.2 or later, which contains the necessary security fixes. System administrators should implement additional protective measures such as restricting file upload capabilities, implementing strict file type validation, and configuring web server rules to prevent execution of uploaded files in web-accessible directories. The principle of least privilege should be enforced by ensuring uploaded files cannot be executed directly, and proper directory permissions should be configured to prevent unauthorized access to upload directories. Network monitoring should be enhanced to detect suspicious file upload activities and direct access patterns to uploaded files, while regular security audits should verify that no malicious files have been successfully uploaded through this vulnerability. Organizations should also consider implementing web application firewalls to detect and block malicious upload attempts, and establish robust incident response procedures to quickly address any exploitation attempts that may occur.