CVE-2018-16593 in Bravia TV
Summary
by MITRE
The Photo Sharing Plus component on Sony Bravia TV through 8.587 devices allows Shell Metacharacter Injection.
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Analysis
by VulDB Data Team • 10/06/2023
The CVE-2018-16593 vulnerability represents a critical command injection flaw within the Photo Sharing Plus component of Sony Bravia television devices running firmware versions up to 8.587. This vulnerability specifically affects the handling of shell metacharacters within the device's photo sharing functionality, creating a pathway for malicious actors to execute arbitrary commands on the affected systems. The issue stems from insufficient input validation and sanitization within the component's processing pipeline, where user-supplied data containing shell metacharacters is not properly escaped or filtered before being passed to system commands.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing shell metacharacters such as semicolons, ampersands, or backticks that are then processed by the device's underlying shell environment. This allows the attacker to inject and execute arbitrary shell commands with the privileges of the affected service or application. The vulnerability is particularly concerning as it exists within a component that is designed to handle user-generated content, making it accessible through normal device usage patterns including photo sharing operations. The attack surface is further expanded by the fact that the component may be accessible through multiple interfaces including web-based management portals and network services that are often exposed to untrusted networks.
From an operational impact perspective, this vulnerability creates significant risks for affected Sony Bravia devices, as it enables remote code execution capabilities that could allow attackers to gain full control over the device. The implications extend beyond simple device compromise, as these television sets often serve as entry points for broader network attacks, particularly in enterprise environments where such devices may be connected to internal networks. The vulnerability's presence in firmware versions up to 8.587 means that a substantial number of devices remain at risk, as many users may not regularly update their device firmware. Additionally, the nature of the vulnerability makes it particularly attractive to threat actors, as it provides a persistent backdoor that can be used for data exfiltration, network reconnaissance, or as a staging point for further attacks within the network infrastructure.
Organizations and individuals should prioritize immediate remediation through firmware updates provided by Sony to address this vulnerability. The mitigation strategy should include network segmentation to limit access to affected devices, implementation of network monitoring to detect suspicious command execution patterns, and regular firmware update policies to ensure all devices remain current with security patches. From a security standards perspective, this vulnerability aligns with CWE-78 which describes improper neutralization of special elements used in shell commands, and maps to ATT&CK technique T1059.004 for command and scripting interpreter. The vulnerability also demonstrates characteristics of a privilege escalation vector, as successful exploitation typically results in elevated privileges on the affected system. Security teams should implement comprehensive device inventory management to identify all affected Sony Bravia devices within their network infrastructure and establish monitoring procedures to detect potential exploitation attempts. The vulnerability underscores the importance of secure coding practices in embedded systems and highlights the need for robust input validation mechanisms in all components that interact with system-level commands.