CVE-2018-5234 in Core Router
Summary
by MITRE
The Norton Core router prior to v237 may be susceptible to a command injection exploit. This is a type of attack in which the goal is execution of arbitrary commands on the host system via vulnerable software.
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Analysis
by VulDB Data Team • 08/12/2024
The vulnerability identified as CVE-2018-5234 affects Norton Core routers running firmware versions prior to v237, representing a critical command injection flaw that exposes users to significant security risks. This vulnerability falls under the common weakness enumeration CWE-77 which specifically addresses command injection flaws in software systems. The flaw allows attackers to execute arbitrary commands on the affected device by exploiting improper input validation mechanisms within the router's web interface or API endpoints. Such vulnerabilities are particularly dangerous in network infrastructure devices as they can provide attackers with direct control over the underlying operating system and network configuration capabilities.
The technical implementation of this command injection vulnerability stems from inadequate sanitization of user-supplied input parameters that are subsequently passed to system commands without proper validation or escaping. Attackers can manipulate input fields within the router's web administration interface or API calls to inject malicious commands that get executed with the privileges of the web server process or system root. This type of vulnerability enables attackers to perform a wide range of malicious activities including but not limited to executing arbitrary code, modifying network configurations, accessing sensitive data, establishing persistent backdoors, and potentially compromising the entire network infrastructure. The attack surface is further expanded due to the router's role as a central network gateway where such compromises can lead to lateral movement and broader network infiltration.
The operational impact of CVE-2018-5234 extends beyond simple unauthorized command execution, as it fundamentally undermines the security posture of networks relying on affected Norton Core routers. Network administrators and end users face risks of complete system compromise, data exfiltration, and potential use of the device as a launching point for attacks against other networked systems. This vulnerability aligns with tactics described in the attack pattern taxonomy where adversaries leverage application-level vulnerabilities to gain system-level privileges. The impact is particularly severe given that routers serve as critical network infrastructure components, making this vulnerability a prime target for both automated exploitation tools and sophisticated attack groups seeking persistent network access. The vulnerability's exploitation potential is further amplified by the fact that many users may not regularly update their router firmware, leaving systems vulnerable for extended periods.
Mitigation strategies for CVE-2018-5234 primarily focus on firmware updates and network segmentation approaches to limit potential damage from successful exploitation attempts. Users should immediately upgrade to firmware version v237 or later, which includes patches addressing the command injection vulnerability through proper input validation and sanitization mechanisms. Network segmentation strategies should be implemented to isolate critical systems from potentially compromised router networks, while also deploying intrusion detection systems to monitor for suspicious command execution patterns. Security configurations should include disabling unnecessary services and ports, implementing strong authentication mechanisms, and regularly auditing network access logs for unauthorized command execution attempts. Organizations should also consider implementing network monitoring solutions that can detect anomalous command execution patterns consistent with command injection attacks, as outlined in various cybersecurity frameworks and best practices for network infrastructure security management.