CVE-2019-9871 in Smart TV FM-K75
Summary
by MITRE
Jector Smart TV FM-K75 devices allow remote code execution because there is an adb open port with root permission.
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Analysis
by VulDB Data Team • 09/25/2023
The vulnerability identified as CVE-2019-9871 affects Jector Smart TV FM-K75 devices and represents a critical security flaw that enables remote code execution through an improperly configured android debug bridge (adb) service. This vulnerability exploits a fundamental misconfiguration where the adb service remains accessible over the network with root privileges, creating an unauthenticated attack vector that can be leveraged by remote adversaries to gain complete control over the affected device.
The technical nature of this vulnerability stems from the improper exposure of the android debug bridge service on a network-accessible port without adequate authentication mechanisms. The adb service, designed primarily for development and debugging purposes, is configured to run with root-level privileges in this specific device implementation, allowing any remote attacker who can establish a connection to the exposed port to execute arbitrary commands with the highest possible system privileges. This configuration violates fundamental security principles of least privilege and network segmentation, as the service operates without proper access controls or authentication requirements.
From an operational impact perspective, this vulnerability presents severe consequences for both individual users and enterprise environments that may deploy these devices. Attackers can exploit this vulnerability to install malicious applications, modify system configurations, access sensitive user data, and potentially use the compromised device as a pivot point for attacking other networked systems. The remote code execution capability means that adversaries do not require physical access to the device or local network presence to exploit the vulnerability, significantly expanding the attack surface and reducing the effectiveness of traditional network security controls.
The vulnerability aligns with several cybersecurity frameworks and threat modeling concepts, including the common weakness enumeration CWE-284 which addresses improper access control, and represents a clear violation of the principle of least privilege as defined in various security standards. From an attack framework perspective, this vulnerability maps directly to the attack technique T1059.007 in the MITRE ATT&CK framework, which covers command and scripting interpreter for remote code execution. The exposure of a service with root privileges over an open network port also represents a significant deviation from industry best practices outlined in security guidelines such as those published by NIST and the Center for Internet Security.
Mitigation strategies for this vulnerability should focus on immediate network-level protections including firewall rules to block access to the adb port, typically TCP port 5555, and the implementation of network segmentation to isolate IoT devices from critical network infrastructure. Device manufacturers should ensure that adb services are disabled by default and only enabled through secure, authenticated channels when development or debugging is required. Network administrators should conduct comprehensive inventory assessments to identify all devices with exposed adb services and implement regular security scanning to detect similar misconfigurations. Additionally, users should be advised to disable unnecessary network services and ensure that all devices are regularly updated with the latest firmware releases that address such security vulnerabilities.