CVE-2018-14495 in FD8136
Summary
by MITRE
Vivotek FD8136 devices allow Remote Command Injection, aka "another command injection vulnerability in our target device," a different issue than CVE-2018-14494.
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Analysis
by VulDB Data Team • 08/06/2024
The Vivotek FD8136 device represents a network camera and video surveillance system that has been identified with a critical remote command injection vulnerability designated as CVE-2018-14495. This vulnerability falls under the broader category of command injection flaws that allow attackers to execute arbitrary commands on the affected device remotely. The issue is particularly concerning as it enables unauthorized individuals to gain control over the surveillance equipment without requiring authentication or physical access to the device. The vulnerability stems from insufficient input validation and sanitization within the device's web interface and API endpoints that handle user-supplied parameters. Attackers can exploit this weakness by crafting malicious payloads that are then interpreted and executed as system commands by the underlying operating system. The device operates on a Linux-based embedded system and uses standard web protocols for management and configuration, making it susceptible to injection attacks that target command execution paths. This vulnerability is classified as a CWE-77 command injection weakness, which is a well-documented and dangerous class of vulnerabilities in web applications and network devices. The ATT&CK framework categorizes this as a command and control technique where adversaries use compromised systems to execute malicious commands, potentially leading to further network infiltration and persistent access.
The technical implementation of this vulnerability occurs when user-provided input is directly concatenated into system command strings without proper sanitization or validation. The affected device processes HTTP requests through its web management interface and API endpoints, where parameters such as device configuration settings, network parameters, or administrative commands are passed to underlying system functions. When these parameters contain malicious command injection sequences such as semicolons, pipes, or other shell metacharacters, the system interprets them as additional commands to execute. The vulnerability is particularly dangerous because it allows attackers to bypass authentication mechanisms entirely, enabling remote execution of arbitrary commands with the privileges of the web server process. This can result in complete system compromise, data exfiltration, or the installation of backdoors on the device. The attack surface is broad as the vulnerability affects multiple operational functions within the device that accept user input, including network configuration settings, log management parameters, and system diagnostics commands. The exploitation requires minimal privileges and can be accomplished through standard web browser interactions, making it accessible to attackers with basic technical knowledge.
The operational impact of CVE-2018-14495 extends beyond simple remote code execution to encompass complete network security compromise of the affected surveillance infrastructure. Once exploited, attackers can gain persistent access to the device and potentially use it as a foothold for further attacks within the network. The compromised device can be used to monitor network traffic, redirect traffic through malicious proxies, or serve as a pivot point for attacking other systems. Surveillance systems are often deployed in sensitive environments where the compromise of a single device can lead to significant privacy violations and security breaches. The vulnerability also affects the integrity of the surveillance data, as attackers can manipulate or delete logs, modify configuration settings, or inject false data into the system. Organizations using these devices may experience service disruption, compliance violations, and potential legal consequences due to unauthorized access to surveillance systems. The attack can result in complete loss of device functionality, unauthorized data collection, or the device being used as part of a larger botnet. Given the nature of surveillance equipment, the compromise can also lead to targeted attacks on specific individuals or organizations, making the vulnerability particularly dangerous in environments with high security requirements. The vulnerability affects not only the immediate device but can also impact the broader network infrastructure, especially if the device is connected to internal networks without proper segmentation.
Mitigation strategies for CVE-2018-14495 require immediate action to address the vulnerability in affected Vivotek FD8136 devices. The primary recommendation is to apply the vendor-provided security patches and firmware updates that contain fixes for the command injection flaw. Organizations should also implement network segmentation to isolate surveillance equipment from critical network segments and apply strict firewall rules to limit access to device management interfaces. Network monitoring should be enhanced to detect unusual command execution patterns or unauthorized access attempts to the device. Access controls should be strengthened through the implementation of multi-factor authentication, secure network protocols, and regular credential rotation. The device configuration should be reviewed to disable unnecessary services and reduce the attack surface. Network administrators should implement intrusion detection systems that can identify and alert on suspicious command injection attempts. Regular security assessments and vulnerability scanning should be conducted to identify similar vulnerabilities in other network equipment. The implementation of secure coding practices should be enforced for any custom applications or scripts that interact with the device's management interfaces. Organizations should also develop incident response procedures specifically tailored to address compromised surveillance equipment, ensuring that security teams can quickly respond to and contain potential attacks. The vulnerability highlights the importance of maintaining up-to-date security measures for network equipment and underscores the need for regular security audits of all connected devices. Proper network hygiene practices including regular patch management, access control reviews, and security monitoring should be implemented as part of comprehensive cybersecurity programs to prevent similar vulnerabilities from being exploited.