CVE-2022-3982 in Appointment Booking System Plugin
Summary
by MITRE • 12/12/2022
The Booking calendar, Appointment Booking System WordPress plugin before 3.2.2 does not validate uploaded files, which could allow unauthenticated users to upload arbitrary files, such as PHP and achieve RCE
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Analysis
by VulDB Data Team • 01/07/2023
The vulnerability identified as CVE-2022-3982 affects the Booking calendar and Appointment Booking System WordPress plugin version 3.2.1 and earlier. This issue represents a critical security flaw that stems from inadequate input validation mechanisms within the plugin's file upload functionality. The vulnerability allows unauthenticated attackers to bypass security restrictions and upload malicious files to the target system, creating a pathway for remote code execution. The flaw exists in the plugin's handling of user-uploaded content, specifically failing to properly validate file types and content before storing them on the web server.
The technical implementation of this vulnerability resides in the plugin's file upload processing logic which lacks proper sanitization and validation checks. Attackers can exploit this weakness by uploading malicious PHP files or other executable content through the plugin's interface. This vulnerability maps to CWE-434, which describes insecure file upload conditions where applications fail to validate or restrict file types, sizes, or content before storing them. The absence of proper file type validation, content inspection, and secure storage mechanisms creates a direct attack vector for arbitrary file upload exploits. The vulnerability is particularly concerning as it does not require authentication, making it accessible to any user with access to the vulnerable plugin's upload interface.
The operational impact of this vulnerability is severe and multifaceted. Successful exploitation enables attackers to achieve full remote code execution on the affected WordPress installation, potentially leading to complete system compromise. Once an attacker uploads a malicious file, they can execute arbitrary commands on the server, access sensitive data, modify website content, or use the compromised system as a pivot point for further attacks within the network. The vulnerability can result in data breaches, service disruption, and potential lateral movement attacks targeting other systems within the same network infrastructure. This type of vulnerability directly aligns with ATT&CK technique T1505.003 for 'Malicious File' and T1059.007 for 'Command and Scripting Interpreter' within the MITRE ATT&CK framework, demonstrating how initial access through file upload can lead to persistent command execution.
Mitigation strategies for CVE-2022-3982 require immediate action including updating to version 3.2.2 or later of the Booking calendar and Appointment Booking System plugin. Organizations should also implement additional protective measures such as restricting file upload capabilities, implementing proper file type validation, and configuring secure file storage with appropriate permissions. Network segmentation and monitoring should be enhanced to detect suspicious file upload activities. Security configurations should enforce strict file type restrictions, implement content inspection for uploaded files, and ensure proper access controls are in place. The vulnerability highlights the importance of regular security updates and proper input validation practices as outlined in OWASP Top 10 and the principle of least privilege access controls. System administrators should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability pattern.