CVE-2020-5560 in WL-Enq
Summary
by MITRE
WL-Enq 1.11 and 1.12 allows remote attackers to execute arbitrary OS commands with the administrative privilege via unspecified vectors.
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Analysis
by VulDB Data Team • 05/11/2024
The vulnerability identified as CVE-2020-5560 affects WL-Enq versions 1.11 and 1.12, representing a critical remote code execution flaw that enables attackers to execute arbitrary operating system commands with administrative privileges. This vulnerability resides within the web-based administration interface of the WL-Enq application, which is commonly used for managing network equipment and services. The unspecified vectors suggest that the flaw exists in how the application processes user input or handles administrative functions, creating a pathway for malicious actors to bypass authentication mechanisms and gain elevated system access. The vulnerability classification aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, indicating that the application fails to properly sanitize input before using it in system calls. This weakness creates a direct pathway for command injection attacks that can be exploited remotely without requiring authentication or prior access to the system. The impact of this vulnerability extends beyond simple privilege escalation as it allows full administrative control over the affected system, potentially enabling attackers to install malware, modify system configurations, steal sensitive data, or establish persistent access. The flaw represents a significant security risk for network infrastructure devices that rely on WL-Enq for management operations, as it could compromise entire network segments if exploited successfully.
The technical exploitation of CVE-2020-5560 occurs through manipulation of input parameters that are subsequently passed to operating system commands without proper validation or sanitization. Attackers can leverage this vulnerability by crafting malicious payloads that exploit the lack of input filtering in the administrative interface, allowing them to inject and execute arbitrary commands on the target system. The vulnerability's remote nature means that attackers do not need physical access to the device or network, making it particularly dangerous for internet-facing management interfaces. This type of vulnerability typically falls under the ATT&CK framework category of T1059 - Command and Scripting Interpreter, where adversaries use legitimate system tools to execute commands. The specific vector likely involves parameter manipulation within web forms, API endpoints, or command-line interfaces that are exposed through the web administration console. The flaw demonstrates poor input validation practices and highlights the importance of implementing proper security controls such as input sanitization, output encoding, and privilege separation. The vulnerability's severity is amplified by the fact that it operates at administrative privilege levels, meaning that successful exploitation can result in complete system compromise. Security researchers have noted that such command injection vulnerabilities often stem from inadequate security testing during development phases, particularly in legacy systems that have not been updated to address modern security requirements.
The operational impact of CVE-2020-5560 extends far beyond immediate system compromise, as it can lead to cascading security failures throughout network infrastructure. Organizations utilizing affected WL-Enq versions face potential data breaches, service disruptions, and regulatory compliance violations that could result in significant financial and reputational damage. The vulnerability's presence in network management interfaces makes it particularly attractive to attackers targeting critical infrastructure, as it provides a direct path to control network devices and potentially compromise entire network segments. The remote exploitability means that attackers can operate from anywhere with internet access, making traditional network perimeter defenses insufficient to prevent exploitation. Organizations may experience unauthorized access to sensitive network information, including device configurations, user credentials, and operational data that could be used for further attacks. The vulnerability's impact is particularly severe for industrial control systems and network infrastructure where WL-Enq is commonly deployed, as these environments often lack the robust security controls found in traditional enterprise environments. The exploitation of this vulnerability could lead to denial of service conditions, data exfiltration, and the establishment of backdoors for persistent access. Network administrators may discover that their monitoring and logging systems have been compromised, potentially masking the actual attack activities and making incident response more difficult.
Mitigation strategies for CVE-2020-5560 require immediate action to address the root cause of the vulnerability through software updates and configuration changes. The primary recommendation involves upgrading to a patched version of WL-Enq that resolves the command injection vulnerability, as provided by the vendor or through official security advisories. Organizations should implement network segmentation to isolate management interfaces from general network access, reducing the attack surface available to potential adversaries. Security controls such as web application firewalls and input validation mechanisms should be deployed to monitor and filter potentially malicious requests to administrative interfaces. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other network management systems. The implementation of principle of least privilege should be enforced, limiting administrative access to only necessary personnel and systems. Network monitoring solutions should be configured to detect unusual command execution patterns or unauthorized access attempts to management interfaces. Security teams should also establish incident response procedures specifically designed to handle remote code execution vulnerabilities, including rapid patch deployment and system forensic analysis. Additional protective measures include disabling unnecessary administrative services, implementing strong authentication mechanisms, and regularly reviewing system logs for signs of exploitation attempts. Organizations should consider implementing network access controls that restrict administrative access based on trusted IP addresses and require multi-factor authentication for all administrative activities. The vulnerability serves as a reminder of the importance of maintaining up-to-date security patches and conducting regular vulnerability assessments to identify and remediate security weaknesses before they can be exploited by malicious actors.