CVE-2023-1384 in Fire TV Stick 3rd Gen
Summary
by MITRE • 05/03/2023
The setMediaSource function on the amzn.thin.pl service does not sanitize the "source" parameter allowing for arbitrary javascript code to be run
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-2023-1384 represents a critical server-side request forgery and cross-site scripting flaw within the Amazon Fire TV ecosystem. This vulnerability exists in the amzn.thin.pl service where the setMediaSource function fails to properly sanitize user-provided input parameters, specifically the "source" parameter that is used to configure media playback sources. The absence of proper input validation creates an environment where malicious actors can inject arbitrary JavaScript code that executes within the context of the Fire TV browser, effectively bypassing the platform's security boundaries. This particular flaw affects widely deployed consumer devices including the Amazon Fire TV Stick 3rd generation and various Insignia TVs running FireOS versions prior to the specified security patches, making it a significant concern for both individual users and enterprise deployments.
The technical exploitation of this vulnerability stems from the service's failure to implement proper input sanitization mechanisms for the source parameter, which directly violates established security principles outlined in CWE-79 - Cross-site Scripting and CWE-20 - Improper Input Validation. The flaw operates at the application layer where user-controllable data flows directly into the media source configuration without adequate filtering or encoding. When a malicious actor crafts a specially formatted source parameter containing JavaScript code, the unvalidated input gets processed and executed within the Fire TV's web rendering environment, potentially allowing for complete device compromise or unauthorized data access. The vulnerability's impact is amplified by the fact that it affects multiple device models and operating system versions, creating a broad attack surface that extends across various consumer electronics platforms.
The operational impact of CVE-2023-1384 extends beyond simple code execution to encompass potential full system compromise and unauthorized access to user data. An attacker could leverage this vulnerability to inject malicious scripts that intercept user credentials, monitor network traffic, or even modify the device's operating behavior to redirect users to malicious websites. The vulnerability's presence in FireOS versions suggests a systemic issue within the platform's input handling mechanisms, potentially affecting other services that rely on similar unvalidated parameter processing. Given that Fire TV devices are commonly used in home networks and may be connected to sensitive IoT ecosystems, this vulnerability creates opportunities for attackers to establish persistent access points or serve as a stepping stone for broader network infiltration. The exploitation of this flaw aligns with ATT&CK technique T1566 - Phishing and T1059 - Command and Scripting Interpreter, as it enables both initial access vectors and post-exploitation command execution capabilities.
Mitigation strategies for CVE-2023-1384 must prioritize immediate firmware updates from Amazon and device manufacturers to address the root cause of the vulnerability. Organizations and individuals should ensure that all affected Fire TV devices are updated to versions 6.2.9.5 or later for Fire TV Stick 3rd generation and 7.6.3.3 or later for Insignia TVs running FireOS. Additionally, network administrators should implement firewall rules that restrict access to the vulnerable amzn.thin.pl service where possible, though this approach is limited by the service's legitimate use within the Fire TV platform. Device users should be advised to avoid visiting untrusted websites or downloading unofficial applications that might interact with the vulnerable service. The vulnerability highlights the importance of input validation and proper security coding practices, particularly in embedded systems and IoT devices where the attack surface is often limited but the impact of exploitation can be severe. Security monitoring should include detection of suspicious media source parameters and anomalous network traffic patterns that might indicate exploitation attempts.