CVE-2017-14432 in EDR-810
Summary
by MITRE
An exploitable command injection vulnerability exists in the web server functionality of Moxa EDR-810 V4.1 build 17030317. A specially crafted HTTP POST can cause a privilege escalation resulting in root shell. An attacker can inject OS commands into the openvpnServer0_tmp= parameter in the "/goform/net\_Web\_get_value" uri to trigger this vulnerability.
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Analysis
by VulDB Data Team • 03/13/2023
The CVE-2017-14432 vulnerability represents a critical command injection flaw in Moxa EDR-810 network devices running firmware version V4.1 build 17030317. This vulnerability resides within the web server functionality of the device, specifically in the handling of HTTP POST requests directed to the /goform/net_Web_get_value URI endpoint. The flaw allows attackers to execute arbitrary operating system commands with elevated privileges, potentially leading to complete system compromise and root shell access. The vulnerability stems from insufficient input validation and sanitization within the device's web interface, creating a direct pathway for malicious command execution.
Technical exploitation of this vulnerability requires crafting a specially formatted HTTP POST request that targets the openvpnServer0_tmp= parameter within the designated URI. The device fails to properly sanitize user-supplied input before incorporating it into system commands, enabling attackers to inject malicious commands that are subsequently executed by the underlying operating system. This command injection occurs at the application layer where the web server processes user input without adequate security controls to prevent unintended command execution. The vulnerability is particularly dangerous because it operates at the privilege level of the web server process, which often runs with elevated permissions, allowing successful privilege escalation to root access.
The operational impact of CVE-2017-14432 extends beyond simple command execution, as it enables full system compromise and persistent access to network infrastructure. An attacker who successfully exploits this vulnerability can gain complete control over the device's operating system, potentially accessing network resources, modifying configurations, or using the device as a pivot point for attacks on other systems within the network. The vulnerability affects the device's network management capabilities, particularly those related to VPN server functionality, making it a significant concern for industrial network security. This flaw directly relates to CWE-78, which describes improper neutralization of special elements used in OS commands, and aligns with ATT&CK technique T1059 for command and scripting interpreter.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from Moxa to address the underlying command injection flaw. Network segmentation and access controls should be implemented to limit exposure of affected devices to untrusted networks or users. Regular security assessments should include verification of device firmware versions and configuration settings to prevent exploitation. Organizations should also implement network monitoring to detect suspicious HTTP POST requests targeting the vulnerable URI endpoint. The vulnerability demonstrates the importance of input validation and proper sanitization in web applications, as well as the critical need for regular security updates in industrial network equipment. This issue highlights the broader challenge of securing embedded network devices where legacy code and insufficient security controls can create persistent attack vectors.