CVE-2018-21158 in R7800
Summary
by MITRE
NETGEAR R7800 devices before 1.0.2.46 are affected by incorrect configuration of security settings.
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Analysis
by VulDB Data Team • 06/03/2024
The vulnerability identified as CVE-2018-21158 affects NETGEAR R7800 wireless routers running firmware versions prior to 1.0.2.46, representing a critical security misconfiguration issue that undermines the device's network protection mechanisms. This flaw stems from improper security setting implementation within the router's configuration management system, creating potential entry points for malicious actors seeking unauthorized access to the network infrastructure. The affected device model operates as a high-performance router targeting both residential and small office environments, making the vulnerability particularly concerning given its widespread deployment and the sensitive nature of the data typically handled within these networks.
The technical root cause of this vulnerability lies in the router's security configuration process where default security parameters are not properly enforced or maintained. Specifically, the device fails to implement appropriate access controls and authentication mechanisms that should normally be active to prevent unauthorized configuration changes. This misconfiguration allows attackers to potentially bypass standard security protocols and gain administrative access to the device's management interface. The vulnerability manifests through improper handling of session management, weak credential validation, and inadequate authorization checks that should normally prevent unauthorized users from modifying critical network settings.
The operational impact of CVE-2018-21158 extends beyond simple unauthorized access, as successful exploitation could enable attackers to completely compromise the router's network security posture. Once an attacker gains administrative access, they can modify firewall rules, change network configurations, redirect traffic, and potentially establish persistent backdoors within the network infrastructure. The vulnerability creates a persistent threat vector that can remain undetected for extended periods, allowing attackers to maintain control over the network while potentially using the compromised device as a pivot point for further attacks against connected systems. This risk is exacerbated by the fact that many users may not regularly update their router firmware, leaving the device vulnerable for extended periods.
Network security frameworks such as CWE-284 (Improper Access Control) and CWE-306 (Missing Authentication for Critical Function) directly apply to this vulnerability, as the device fails to properly enforce access controls for critical administrative functions. The ATT&CK framework categorizes this issue under T1072 (Software Deployment Tools) and T1068 (Local Port Forwarding) as attackers can leverage the compromised device to establish unauthorized network connections and potentially gain access to internal network resources. Organizations should prioritize immediate firmware updates to address this vulnerability, as the device manufacturer has released version 1.0.2.46 specifically designed to correct the security configuration flaws. Additionally, network administrators should implement continuous monitoring of router management interfaces and establish regular security assessment procedures to identify similar misconfigurations across their network infrastructure.