CVE-2017-14433 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 remoteNetwork0= parameter in the "/goform/net\_Web\_get_value" uri to trigger this vulnerability.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 03/13/2023
The CVE-2017-14433 vulnerability represents a critical command injection flaw in Moxa EDR-810 network security appliances running firmware version V4.1 build 17030317. This vulnerability resides within the web server functionality of the device, specifically targeting the network configuration management interface. The flaw allows remote attackers to execute arbitrary operating system commands with elevated privileges, potentially leading to complete system compromise and root shell access. The vulnerability manifests through the manipulation of the remoteNetwork0= parameter within the /goform/net_Web_get_value URI endpoint, which processes user-supplied input without proper sanitization or validation mechanisms.
This command injection vulnerability stems from insufficient input validation and improper sanitization of user-provided data within the web application layer. The affected parameter remoteNetwork0= receives untrusted input from HTTP POST requests and directly incorporates this data into system commands without adequate escaping or filtering. The vulnerability is particularly concerning because it allows privilege escalation from regular user access to root privileges, enabling attackers to execute any command with the highest system permissions. The attack vector requires only a specially crafted HTTP POST request to the specific URI endpoint, making it accessible to remote attackers without requiring physical access or authentication.
The operational impact of this vulnerability extends beyond simple command execution, as it provides attackers with complete control over the affected device and potentially the network segment it protects. Successful exploitation can result in data exfiltration, network reconnaissance, lateral movement, and persistence mechanisms. The compromised device could serve as a pivot point for attacking other systems within the network, undermining the security posture of organizations relying on Moxa EDR-810 appliances for network security. The vulnerability affects the device's core network configuration functionality, potentially allowing attackers to modify network settings, disable security features, or redirect traffic to malicious endpoints.
Security professionals should recognize this vulnerability as a variant of CWE-77 and CWE-89, which represent command injection and SQL injection respectively within the Common Weakness Enumeration framework. The ATT&CK framework categorizes this vulnerability under T1059.001 for command and script interpreter, with potential connections to T1068 for exploit for privilege escalation and T1083 for file and directory discovery. Organizations should implement immediate mitigations including firmware updates from Moxa, network segmentation to limit access to affected devices, and firewall rules blocking access to the vulnerable URI endpoint. Additionally, deploying web application firewalls and implementing proper input validation and output encoding can provide defense-in-depth measures against similar vulnerabilities in the future.