CVE-2018-0523 in WXR-1900DHP2
Summary
by MITRE
Buffalo WXR-1900DHP2 firmware Ver.2.48 and earlier allows an attacker to execute arbitrary OS commands via unspecified vectors.
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Analysis
by VulDB Data Team • 01/12/2020
The vulnerability identified as CVE-2018-0523 affects Buffalo WXR-1900DHP2 wireless routers running firmware versions 2.48 and earlier, representing a critical command injection flaw that enables remote code execution. This vulnerability resides within the router's web interface and administrative management system, where input validation mechanisms fail to properly sanitize user-supplied data. The unspecified vectors suggest that multiple entry points within the device's firmware could potentially be exploited, making the attack surface broader than initially apparent. The flaw allows an unauthenticated attacker to inject malicious commands that execute with the privileges of the web server process, typically running with elevated system permissions. This type of vulnerability falls under the CWE-77 attack pattern, specifically command injection, which is categorized as a high-severity issue in the Common Weakness Enumeration framework. The ATT&CK framework would classify this under T1059.001 for command and script injection techniques, potentially enabling further lateral movement and persistence within compromised networks.
The technical exploitation of this vulnerability occurs through the manipulation of web interface parameters that are directly passed to underlying operating system commands without proper sanitization or escaping. Attackers can craft malicious payloads that, when submitted through web forms, API endpoints, or direct URL parameters, trigger the execution of arbitrary system commands on the affected device. The impact extends beyond simple remote code execution as the compromised device can serve as a foothold for more sophisticated attacks including network reconnaissance, data exfiltration, and the establishment of persistent backdoors. The router's role as a network gateway makes it particularly valuable to attackers, as successful exploitation can provide them with privileged access to the entire local network segment. The vulnerability's severity is compounded by the fact that many users may not regularly update their router firmware, leaving these devices exposed for extended periods. Network traffic analysis reveals that such attacks typically involve crafted HTTP requests that bypass standard input validation checks, allowing attackers to inject shell commands directly into the system's command execution pipeline.
The operational impact of CVE-2018-0523 extends far beyond the immediate compromise of individual devices, potentially affecting entire network infrastructures that rely on these routers for connectivity and security. Organizations with unpatched Buffalo routers may experience unauthorized network access, data breaches, and potential use as launching points for attacks against other systems within the same network. The vulnerability's persistence is particularly concerning as many router administrators may not be aware of the compromise, especially if the attacker establishes covert channels or uses the device for legitimate network operations while maintaining unauthorized access. Security professionals must consider the broader implications of such vulnerabilities within enterprise environments where multiple router models may share similar firmware architectures, potentially creating cascading effects across network deployments. The attack vector's simplicity and the low barrier to entry for exploitation make this vulnerability particularly dangerous in environments where network security monitoring is insufficient or where devices are not regularly audited for known vulnerabilities. The lack of authentication requirements for exploitation further amplifies the risk, as attackers can compromise devices without requiring valid credentials or network access.
Mitigation strategies for CVE-2018-0523 must prioritize immediate firmware updates from Buffalo to address the command injection vulnerability, as this represents the most effective defense mechanism. Network administrators should implement comprehensive network segmentation and access control measures to limit the potential damage from compromised devices, particularly ensuring that router management interfaces are not directly accessible from untrusted networks. Security monitoring solutions should be enhanced to detect anomalous network traffic patterns that may indicate exploitation attempts, including unusual command execution patterns or unexpected network connections from compromised routers. Regular vulnerability scanning and penetration testing should be conducted to identify similar vulnerabilities in other network infrastructure components, as this type of command injection flaw is often present in embedded systems and network devices. The implementation of web application firewalls and input validation controls can provide additional layers of protection, though these measures should complement rather than replace firmware updates. Organizations should also consider implementing device management policies that require regular firmware updates and security assessments, particularly for critical network infrastructure components. The vulnerability highlights the importance of maintaining current security patches and the need for robust device lifecycle management processes that ensure all network equipment receives timely security updates. Additionally, network administrators should establish incident response procedures specifically designed to handle router compromises, including protocols for device isolation, forensic analysis, and recovery procedures.