CVE-2018-14826 in EMG12
Summary
by MITRE
Entes EMG12 versions 2.57 and prior The application uses a web interface where it is possible for an attacker to bypass authentication with a specially crafted URL. This could allow for remote code execution.
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Analysis
by VulDB Data Team • 03/28/2020
The vulnerability identified as CVE-2018-14826 affects Entes EMG12 devices running firmware versions 2.57 and earlier, representing a critical authentication bypass flaw that can lead to remote code execution. This issue stems from improper access control mechanisms within the device's web interface implementation, creating a pathway for unauthenticated attackers to gain administrative privileges without legitimate credentials. The vulnerability specifically manifests through a flaw in how the application processes URL parameters, allowing malicious actors to construct specially crafted requests that circumvent the authentication system entirely.
The technical implementation of this vulnerability involves the application's failure to properly validate and sanitize URL inputs, creating a direct path for privilege escalation attacks. When an attacker constructs a specific URL pattern, the device's web server fails to enforce proper authentication checks, effectively granting full administrative access to unauthorized users. This flaw operates at the application layer and can be exploited remotely over the network without requiring physical access to the device or prior authentication credentials. The vulnerability's exploitation does not require specialized tools or extensive knowledge, making it particularly dangerous as it can be leveraged by attackers with minimal technical expertise.
From an operational impact perspective, this vulnerability presents a severe risk to network security and device integrity. Once exploited, attackers can execute arbitrary code on the affected devices, potentially leading to complete system compromise, data exfiltration, or use of the device as a pivot point for further attacks within the network. The remote code execution capability allows threat actors to install malware, modify device configurations, or establish persistent access points. This vulnerability directly impacts the CIA triad by compromising confidentiality through potential data access, integrity through configuration changes, and availability through possible device disruption or takeover.
The flaw aligns with CWE-287, which addresses improper authentication issues in software systems, and corresponds to attack techniques listed in the MITRE ATT&CK framework under T1078 for valid accounts and T1059 for command and scripting interpreter. Organizations using affected Entes EMG12 devices face significant exposure risks, particularly in environments where these devices serve as network gateways or security appliances. The vulnerability's impact extends beyond individual device compromise to potentially affect entire network infrastructures, especially when multiple affected devices exist within the same network segment. Network administrators should consider this vulnerability as part of a broader attack surface that may require comprehensive security assessments and network segmentation strategies.
Mitigation strategies should include immediate firmware updates to versions 2.58 or later, which contain the necessary authentication fixes. Organizations should also implement network segmentation to limit access to affected devices, disable unnecessary web interfaces when possible, and monitor network traffic for suspicious URL patterns or unauthorized access attempts. Additional protective measures include implementing strong network access controls, regular security audits, and maintaining up-to-date vulnerability management processes. The vulnerability highlights the importance of proper input validation and authentication mechanisms in network appliances, emphasizing that even seemingly simple web applications require robust security implementation to prevent privilege escalation attacks.