CVE-2017-14434 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 remoteNetmask0= 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-2017-14434 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 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 is particularly concerning as it enables privilege escalation from regular user access to administrative root-level control, making it a severe threat to network infrastructure security.
The technical exploitation mechanism involves injection of malicious commands through the remoteNetmask0= parameter within the HTTP POST request payload. When the web server processes this parameter without proper input validation or sanitization, it directly incorporates the user-supplied data into system commands, creating a classic command injection vulnerability. This weakness falls under CWE-77 which specifically addresses command injection vulnerabilities where untrusted data is passed to system commands. The vulnerability demonstrates poor input validation practices and inadequate sanitization of user-supplied parameters before their use in operating system command execution contexts.
The operational impact of this vulnerability extends beyond simple command execution to encompass full system compromise and persistent access. Successful exploitation allows attackers to execute arbitrary code with root privileges, potentially enabling them to install backdoors, modify system configurations, exfiltrate sensitive data, or establish persistent access points within the network. Network administrators face significant risk as these devices often serve as critical infrastructure components in industrial environments where they may control network connectivity and security policies. The vulnerability affects the device's network configuration functionality, making it particularly dangerous for attackers who can manipulate network parameters to redirect traffic or disable security features.
Mitigation strategies for CVE-2017-14434 should prioritize immediate firmware updates from Moxa to address the command injection vulnerability. Organizations should implement network segmentation to limit access to these devices to authorized personnel only, and establish robust network monitoring to detect anomalous command execution patterns. Input validation controls should be implemented at multiple layers including web application firewalls and network access controls. The vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation, making it a significant concern for threat hunters and security operations teams. Regular security assessments and vulnerability scanning should be conducted to identify similar unpatched devices within the network infrastructure, as this vulnerability represents a common pattern of insecure input handling in embedded network devices.