CVE-2016-8481 in Android
Summary
by MITRE
An elevation of privilege vulnerability in the Qualcomm sound 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: Kernel-3.10, Kernel-3.18. Android ID: A-31906415. References: QC-CR#1078000.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 11/12/2022
The vulnerability identified as CVE-2016-8481 represents a critical elevation of privilege flaw within the Qualcomm sound driver component of Android operating systems. This security weakness exists in kernel versions 3.10 and 3.18, affecting the broader Android ecosystem and specifically targeting the Qualcomm Snapdragon processor family. The vulnerability allows a local malicious application to escalate its privileges and execute arbitrary code with kernel-level permissions, fundamentally compromising the system's security model. The issue is classified as High severity due to the requirement of first compromising a privileged process, which creates a multi-layered attack vector that significantly increases the potential impact on system integrity.
The technical flaw stems from improper input validation and memory management within the Qualcomm sound driver implementation. When a malicious application attempts to interact with the sound driver through kernel interfaces, specific input parameters are not adequately sanitized or validated, creating a pathway for privilege escalation. This vulnerability falls under the CWE-119 category of "Improper Access to Memory" and represents a classic kernel exploit scenario where user-space applications can manipulate kernel data structures. The attack typically involves crafting specific audio-related system calls that trigger buffer overflows or memory corruption within the driver's kernel code execution path. The Qualcomm sound driver's handling of audio device control and configuration parameters creates multiple potential entry points where untrusted input can be processed without proper security boundaries.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally undermines the Android security model's principle of least privilege and kernel isolation. Once successfully exploited, the malicious application gains complete control over the kernel execution environment, enabling it to modify system files, disable security mechanisms, install persistent backdoors, and access all system resources without restriction. The attack requires initial compromise of a privileged process, which aligns with the ATT&CK framework's technique T1068 for "Exploitation for Privilege Escalation" and T1059 for "Command and Scripting Interpreter" in the execution phase. This vulnerability essentially creates a persistent kernel-level backdoor that can be leveraged for advanced persistent threats, data exfiltration, and complete system compromise. The exploitation process typically involves a two-stage attack where the initial compromise occurs through a legitimate privileged application, followed by the kernel-level privilege escalation.
Mitigation strategies for CVE-2016-8481 require both immediate patching and long-term architectural improvements to prevent similar vulnerabilities in the future. The primary solution involves applying the official Android security patches that address the specific kernel-level memory handling issues within the Qualcomm sound driver. Organizations should also implement runtime monitoring to detect anomalous kernel behavior patterns that may indicate exploitation attempts. The vulnerability highlights the importance of kernel driver security reviews and proper input validation mechanisms. Security measures should include mandatory code reviews for all kernel modules, implementation of kernel address space layout randomization, and enhanced memory protection mechanisms such as stack canaries and data execution prevention. Additionally, device manufacturers should consider implementing secure boot processes and runtime integrity checks to prevent unauthorized kernel modifications. The vulnerability serves as a reminder of the critical need for comprehensive security testing of kernel drivers and the importance of maintaining up-to-date security patches across all system components.