CVE-2016-6784 in Android
Summary
by MITRE
An elevation of privilege vulnerability in the MediaTek driver could enable a local malicious application to execute arbitrary code within the context of the kernel. This issue is rated as High because it first requires compromising a privileged process. Product: Android. Versions: N/A. Android ID: A-31350755. References: MT-ALPS02961424.
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Analysis
by VulDB Data Team • 07/20/2020
The vulnerability identified as CVE-2016-6784 represents a critical elevation of privilege flaw within MediaTek driver components that operates at the kernel level within Android operating systems. This vulnerability specifically targets the MediaTek chipset implementations and creates a pathway for local malicious applications to escalate their privileges and execute arbitrary code with kernel-level permissions. The issue is classified as High severity due to its requirement for initial compromise of a privileged process, which significantly reduces the attack surface but does not eliminate the serious implications for system security.
The technical flaw stems from improper privilege handling within the MediaTek driver implementation, where insufficient validation mechanisms allow malicious applications to exploit kernel-level interfaces and escalate their execution context. This vulnerability operates at the intersection of hardware and software security boundaries, leveraging the trust relationship between the driver and the kernel to bypass normal security controls. The flaw essentially creates a backdoor pathway through which unprivileged code can gain kernel-level execution capabilities, fundamentally undermining the security model of the Android operating system.
From an operational perspective, this vulnerability presents a significant risk to Android devices that utilize MediaTek chipsets, as it allows attackers who have already compromised a privileged process to gain complete control over the device's kernel. The impact extends beyond simple privilege escalation to encompass full system compromise, potentially enabling attackers to modify system files, extract sensitive data, or establish persistent backdoors. The vulnerability's exploitation requires initial access to a privileged process, which aligns with ATT&CK technique T1068 for local privilege escalation and T1548.001 for abuse of privilege escalation capabilities.
The security implications of CVE-2016-6784 are particularly concerning given that MediaTek chipsets were widely deployed across numerous Android device manufacturers, creating a broad potential attack surface. This vulnerability demonstrates the critical importance of driver security in mobile platforms and highlights how hardware-level implementations can introduce fundamental security weaknesses that affect entire device ecosystems. The issue also reflects the broader challenge of securing complex hardware-software integration points where multiple security layers must work in concert to maintain system integrity. Organizations should implement comprehensive patch management strategies to address this vulnerability, as it represents a fundamental breakdown in the kernel's privilege enforcement mechanisms.
Mitigation strategies for this vulnerability should include immediate deployment of manufacturer-provided security patches, implementation of runtime monitoring for suspicious kernel-level activities, and enhanced application sandboxing measures. The vulnerability's classification under CWE categories related to privilege escalation and kernel security flaws emphasizes the need for comprehensive security testing of driver components. Security teams should also consider implementing additional monitoring controls to detect potential exploitation attempts and establish incident response procedures specifically addressing kernel-level privilege escalation attacks. The vulnerability serves as a reminder of the critical importance of maintaining security updates for all system components, particularly those operating at the kernel level where the consequences of exploitation can be catastrophic.