CVE-2020-7864 in DEXT5Editor
Summary
by MITRE • 06/16/2021
Parameter manipulation can bypass authentication to cause file upload and execution. This will execute the remote code. This issue affects: Raonwiz DEXT5Editor versions prior to 3.5.1405747.1100.03.
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Analysis
by VulDB Data Team • 06/18/2021
The vulnerability identified as CVE-2020-7864 represents a critical authentication bypass flaw within Raonwiz DEXT5Editor software versions prior to 3.5.1405747.1100.03. This issue stems from improper parameter validation mechanisms that allow attackers to manipulate input parameters during authentication processes. The vulnerability exists in the web-based file upload functionality where the application fails to properly validate user-supplied parameters before processing authentication requests. When an attacker manipulates specific parameters in the authentication flow, they can bypass the intended security controls and gain unauthorized access to the system. This authentication bypass directly enables unauthorized file upload capabilities, creating a pathway for remote code execution through malicious file uploads. The flaw operates at the application layer and specifically targets the parameter handling mechanisms used during user authentication and file processing operations.
The technical implementation of this vulnerability involves manipulation of HTTP request parameters that control authentication flow and file handling operations. Attackers can exploit this by crafting malicious requests that alter parameter values in ways that circumvent normal authentication checks. The vulnerability manifests when the application processes user input without adequate sanitization or validation, allowing parameter tampering to succeed. This creates a condition where legitimate authentication mechanisms are bypassed, enabling attackers to upload arbitrary files to the server. The uploaded files can contain malicious code that executes in the context of the web server, potentially allowing full system compromise. The flaw demonstrates poor input validation practices and inadequate parameter sanitization, which are fundamental security weaknesses that align with CWE-20 - Improper Input Validation. The vulnerability enables privilege escalation and arbitrary code execution, representing a severe security risk that could be exploited by remote attackers without requiring authentication.
The operational impact of CVE-2020-7864 extends beyond simple authentication bypass to encompass complete system compromise capabilities. Once an attacker successfully manipulates parameters to bypass authentication, they can upload malicious files that execute arbitrary code on the target system. This remote code execution capability allows attackers to establish persistent access, escalate privileges, and potentially move laterally within network environments. The vulnerability affects the integrity and confidentiality of data processed through the DEXT5Editor application, as attackers can upload malicious payloads that may exfiltrate sensitive information or modify system configurations. Organizations using affected versions face significant risk of data breaches, system infiltration, and potential regulatory compliance violations. The attack surface includes web-based interfaces and file upload mechanisms that are commonly targeted in web application exploitation campaigns, making this vulnerability particularly dangerous in enterprise environments where such editors are widely deployed. This flaw directly maps to ATT&CK technique T1078 - Valid Accounts and T1190 - Exploit Public-Facing Application, as it allows exploitation of publicly accessible web interfaces to achieve unauthorized access and code execution.
Mitigation strategies for CVE-2020-7864 focus primarily on updating to the patched version 3.5.1405747.1100.03 or later, which contains proper parameter validation and authentication mechanisms. Organizations should implement comprehensive input validation controls to prevent parameter manipulation attempts and ensure all user-supplied data is properly sanitized before processing. Network segmentation and access controls should be implemented to limit exposure of vulnerable web interfaces to untrusted networks. Regular security assessments and penetration testing should be conducted to identify similar parameter validation vulnerabilities in other applications. The implementation of web application firewalls can provide additional protection against parameter manipulation attacks, while monitoring and logging mechanisms should be enhanced to detect suspicious authentication attempts. Security teams should also consider implementing automated patch management processes to ensure timely deployment of security updates. Defense-in-depth strategies should include regular vulnerability scanning, code review practices focused on input validation, and employee training on recognizing and reporting potential exploitation attempts. Organizations should also maintain detailed inventory of all deployed DEXT5Editor versions to quickly identify and remediate vulnerable systems across their infrastructure.