CVE-2020-7875 in Dext5 Upload
Summary
by MITRE • 10/28/2021
DEXT5 Upload 5.0.0.117 and earlier versions contain a vulnerability, which could allow remote attacker to download and execute remote file by setting the argument, variable in the activeX module. This can be leveraged for code execution.
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Analysis
by VulDB Data Team • 11/03/2021
The vulnerability identified as CVE-2020-7875 affects DEXT5 Upload version 5.0.0.117 and earlier, representing a critical security flaw that enables remote code execution through improper input validation within the ActiveX module. This vulnerability resides in the file upload functionality of the software, creating an exploitable condition that allows attackers to manipulate the application's behavior through crafted input parameters. The issue stems from insufficient sanitization of user-supplied data, particularly within the ActiveX component that handles file operations, which directly contradicts security best practices outlined in CWE-20, which addresses improper input validation as a fundamental weakness in software security architecture.
The technical exploitation of this vulnerability occurs when an attacker manipulates argument variables within the ActiveX module to bypass normal file upload restrictions. This manipulation allows the attacker to specify arbitrary file paths or execute commands through the vulnerable interface, effectively enabling remote file download and execution capabilities. The flaw operates at the application layer where the ActiveX component fails to properly validate or sanitize input parameters, creating a path for malicious code injection that can be leveraged to execute arbitrary commands on the target system. This vulnerability directly maps to ATT&CK technique T1203, which involves exploiting software vulnerabilities to gain code execution privileges, and represents a classic example of how ActiveX controls can be weaponized when proper input validation is absent.
The operational impact of CVE-2020-7875 extends beyond simple remote code execution to encompass potential system compromise and data exfiltration capabilities. An attacker who successfully exploits this vulnerability can establish persistent access to the affected system, potentially using it as a foothold for further network infiltration. The vulnerability affects the integrity and confidentiality of the system, as the attacker can download additional malicious payloads, modify system files, or extract sensitive information from the compromised environment. The attack surface is particularly concerning given that ActiveX controls are typically deployed in environments where users have elevated privileges, amplifying the potential damage from a successful exploitation. Organizations relying on DEXT5 Upload for file management operations face significant risk of unauthorized access and system compromise, particularly in enterprise environments where file upload functionalities are frequently used for business-critical operations.
Mitigation strategies for CVE-2020-7875 should prioritize immediate software updates to version 5.0.0.118 or later, which contain patches addressing the input validation issues within the ActiveX module. System administrators should implement network-level restrictions to limit access to the vulnerable upload functionality, particularly disabling ActiveX controls in web browsers where possible. The implementation of web application firewalls and input validation rules can help detect and prevent exploitation attempts by blocking malicious parameter values. Additionally, organizations should conduct comprehensive security assessments to identify any other ActiveX-based components that might share similar vulnerabilities, as this flaw represents a pattern of improper input handling that could affect other software modules. The vulnerability highlights the importance of following secure coding practices and implementing proper input validation at all levels of application architecture, aligning with industry standards that emphasize the need for robust sanitization of user inputs to prevent injection attacks and maintain system integrity.