CVE-2023-1383 in Fire TV Stick 3rd Gen
Summary
by MITRE • 05/03/2023
An Improper Enforcement of Behavioral Workflow vulnerability in the exchangeDeviceServices function on the amzn.dmgr service allowed an attacker to register services that are only locally accessible.
This issue affects:
Amazon Fire TV Stick 3rd gen versions prior to 6.2.9.5. Insignia TV with FireOS versions prior to 7.6.3.3.
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Analysis
by VulDB Data Team • 05/27/2023
The vulnerability identified as CVE-2023-1383 represents a critical weakness in the Amazon Fire TV ecosystem that stems from improper enforcement of behavioral workflow controls within the exchangeDeviceServices function of the amzn.dmgr service. This flaw exists at the core of device management operations and allows for unauthorized service registration that should remain restricted to local network access only. The vulnerability manifests specifically within the device management framework that governs how devices communicate and register services with the Amazon ecosystem, creating a pathway for malicious actors to bypass intended security boundaries.
The technical implementation of this vulnerability resides in the amzn.dmgr service which handles device service registration and management protocols. When the exchangeDeviceServices function processes incoming service registration requests, it fails to properly validate the source and scope of these registration attempts. This inadequate validation allows an attacker to register services that are typically restricted to local network access, effectively breaking the intended network segmentation and access control mechanisms. The flaw operates at the service level within the device management infrastructure, where proper access controls should prevent external registration of local-only services.
The operational impact of this vulnerability extends significantly across the affected device ecosystem, particularly targeting Amazon Fire TV Stick 3rd generation devices running versions prior to 6.2.9.5 and Insignia TVs with FireOS versions prior to 7.6.3.3. Attackers could potentially exploit this weakness to register malicious services that appear to be legitimate local services, enabling them to intercept or manipulate device communications. This capability could lead to man-in-the-middle attacks, unauthorized data collection, or even service disruption. The vulnerability creates a persistent threat vector that remains active until the affected devices receive security updates, potentially exposing users to long-term risks.
This vulnerability aligns with CWE-693 which describes protection mechanism failures, specifically in how behavioral workflows are enforced within service management systems. The flaw demonstrates a breakdown in the principle of least privilege where services that should only operate within local network boundaries are permitted to register from external sources. From an attack perspective, this vulnerability maps to several ATT&CK techniques including T1071.004 for application layer protocols and T1566 for credential harvesting through service manipulation. The issue represents a failure in the device management service's authentication and authorization mechanisms, creating opportunities for lateral movement and service hijacking within the local network environment.
Mitigation strategies should focus on immediate firmware updates for all affected device models to address the core service validation flaw. Network administrators and device owners should implement additional monitoring of service registration activities within local networks to detect anomalous behavior. The implementation of network segmentation and firewall rules that restrict access to device management services can provide additional defense layers. Regular security audits of device management protocols and service registration processes should be conducted to identify similar vulnerabilities. Organizations should also consider implementing device integrity monitoring solutions that can detect unauthorized service registrations and alert security teams to potential exploitation attempts.