CVE-2016-6674 in Android
Summary
by MITRE
system_server in Android before 2016-10-05 on Nexus devices allows attackers to gain privileges via a crafted application, aka internal bug 30445380.
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Analysis
by VulDB Data Team • 09/13/2025
The vulnerability identified as CVE-2016-6674 represents a critical privilege escalation flaw within the Android system_server component that affected Nexus devices prior to the 2016-10-05 security update. This vulnerability resides in the core system service responsible for managing various Android system-level functionalities and inter-process communications. The issue stems from inadequate input validation and privilege checking mechanisms within the system_server daemon, which processes requests from applications and system services. Attackers could exploit this weakness by crafting a malicious application that leverages specific system calls or IPC mechanisms to manipulate the system_server process into executing unauthorized operations with elevated privileges. The vulnerability specifically targets the Android operating system's security model where the system_server acts as a trusted component that should only execute operations with proper authorization. This flaw essentially allows an unprivileged application to elevate its privileges to that of the system user, thereby gaining complete control over the device's core functionalities and potentially accessing sensitive system resources.
The technical exploitation of CVE-2016-6674 involves leveraging the system_server's insufficient validation of incoming requests to manipulate the privilege escalation process. The vulnerability manifests when the system_server fails to properly verify the authenticity and authorization level of requests originating from applications, particularly those related to system-level operations. This weakness can be categorized under CWE-264, which addresses permissions, privileges, and access controls in software systems. The attack vector typically involves a malicious application that sends specially crafted requests to the system_server through Android's inter-process communication mechanisms, exploiting a race condition or improper access control check that allows the application to bypass normal privilege boundaries. The vulnerability demonstrates a fundamental breakdown in the Android security model's principle of least privilege, where applications should not be able to perform operations that require system-level permissions without proper authorization.
The operational impact of this privilege escalation vulnerability extends far beyond simple unauthorized access, as it fundamentally compromises the integrity and security of the entire Android system. Once successfully exploited, the malicious application gains access to system-level resources including the ability to read/write to protected system files, modify system configurations, install additional applications, and potentially access user data. This vulnerability affects all Nexus devices running Android versions prior to the October 2016 security patch, which represents a significant portion of Android users who relied on Google's flagship devices. The security implications are severe because the system_server is a critical component that manages various system services and should operate with the highest level of security controls. This vulnerability enables attackers to establish persistent backdoors, monitor user activities, and potentially compromise the device's encryption keys or other sensitive system components. The impact on enterprise environments is particularly concerning as it could allow attackers to gain control over corporate devices that contain sensitive business data.
Mitigation strategies for CVE-2016-6674 focus primarily on applying the security patches released by Google in their October 2016 updates for Nexus devices. The most effective solution involves ensuring that all affected Nexus devices receive the appropriate security update that addresses the privilege escalation flaw in the system_server component. Organizations should implement comprehensive device management policies that enforce timely security updates and monitor for vulnerable devices within their networks. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates the risks associated with delaying critical security updates. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be categorized under T1068, which covers the use of elevated privileges for system access. Network administrators should consider implementing mobile device management solutions that can automatically detect and remediate vulnerable devices, as well as monitor for suspicious activities that might indicate exploitation attempts. Additionally, users should be educated about the importance of applying security updates promptly and should avoid installing applications from untrusted sources that might contain malicious code designed to exploit such vulnerabilities.