CVE-2022-3771 in easyii
Summary
by MITRE • 10/31/2022
A vulnerability, which was classified as critical, has been found in easyii CMS. This issue affects the function file of the file helpers/Upload.php of the component File Upload Management. The manipulation leads to unrestricted upload. The attack may be initiated remotely. The identifier VDB-212501 was assigned to this vulnerability.
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Analysis
by VulDB Data Team • 11/26/2022
The vulnerability identified as CVE-2022-3771 represents a critical security flaw in the easyii CMS platform that fundamentally compromises the integrity of file upload functionality. This vulnerability resides within the file helpers/Upload.php component of the File Upload Management system, making it a core element of the application's security architecture. The flaw allows for unrestricted file uploads, which creates an exploitable pathway for malicious actors to bypass normal security controls and potentially execute arbitrary code on the affected server. The vulnerability's classification as critical indicates the severe potential impact on system security and data integrity.
The technical nature of this flaw stems from inadequate validation and sanitization of uploaded files within the Upload.php helper function. When users or attackers submit files through the CMS interface, the system fails to properly verify file types, content, or execution permissions, creating a direct pathway for malicious payloads to be stored and executed. This unrestricted upload capability directly maps to CWE-434, which specifically addresses the insecure upload of executable files, and aligns with ATT&CK technique T1195.001 for the exploitation of web applications through file upload vulnerabilities. The vulnerability's remote exploitation capability means that attackers do not require physical access to the system, making it particularly dangerous for web-facing applications.
The operational impact of CVE-2022-3771 extends far beyond simple data compromise, as it enables full system takeover potential for malicious actors. Successful exploitation could allow attackers to upload web shells, malware, or other malicious executables that would execute with the privileges of the web server process. This creates a persistent threat vector that could lead to complete system compromise, data exfiltration, service disruption, and potential lateral movement within network environments. Organizations running easyii CMS systems are at significant risk of unauthorized access, as the vulnerability effectively removes the primary security barrier that file upload mechanisms are designed to provide.
Mitigation strategies for this vulnerability must be implemented immediately and comprehensively. The primary remediation involves patching the Upload.php helper function to implement strict file type validation, content verification, and secure storage practices. Organizations should enforce whitelist-based file type restrictions, implement proper file extension validation, and ensure that uploaded files are stored in non-executable directories. Additional defensive measures include implementing web application firewalls to monitor and filter suspicious upload attempts, configuring proper access controls for upload directories, and establishing robust monitoring protocols for unusual file upload activities. Security teams should also consider implementing automated scanning tools to detect and prevent malicious file uploads while ensuring that all file upload functionality undergoes rigorous security testing before deployment. The vulnerability demonstrates the critical importance of input validation and secure coding practices in preventing remote code execution through file upload mechanisms.