CVE-2016-8436 in Android
Summary
by MITRE
An elevation of privilege vulnerability in the Qualcomm video driver could enable a local malicious application to execute arbitrary code within the context of the kernel. This issue is rated as Critical due to the possibility of a local permanent device compromise, which may require reflashing the operating system to repair the device. Product: Android. Versions: Kernel-3.18. Android ID: A-32450261. References: QC-CR#1007860.
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Analysis
by VulDB Data Team • 10/27/2022
The vulnerability identified as CVE-2016-8436 represents a critical elevation of privilege flaw within the Qualcomm video driver component of Android devices running kernel version 3.18. This vulnerability exists at the intersection of hardware and software security domains, specifically targeting the kernel-level video processing subsystem that is integral to device functionality. The flaw allows a locally malicious application to escalate its privileges from user-level execution to kernel-level operations, creating a pathway for arbitrary code execution with the highest possible system permissions. The severity classification as Critical reflects the potential for complete device compromise, where the malicious actor could gain unrestricted access to all system resources and data.
The technical root cause of this vulnerability stems from improper input validation and memory management within the Qualcomm video driver implementation. When processing video-related commands or data streams, the driver fails to properly validate certain parameters or memory references, creating opportunities for buffer overflows, memory corruption, or other exploitable conditions. This type of vulnerability falls under the Common Weakness Enumeration category of CWE-121, which deals with stack-based buffer overflow conditions, and may also relate to CWE-787, representing out-of-bounds write vulnerabilities. The attack vector requires local execution privileges, meaning a malicious application must already be installed on the device to exploit this weakness, but once successful, it provides complete kernel-level control.
The operational impact of CVE-2016-8436 extends beyond simple privilege escalation, as it fundamentally compromises the security model of Android devices. A successful exploitation enables attackers to bypass all kernel-level security mechanisms, including memory protection, privilege separation, and system integrity checks. This allows for persistent backdoor installation, complete data exfiltration, modification of system files, and potential exploitation of other vulnerabilities that may be present. The vulnerability's potential for permanent device compromise means that even after device reboot or normal security updates, the malicious modifications could persist unless the device undergoes complete factory reset or operating system reinstallation. This aligns with ATT&CK technique T1055, which covers privilege escalation through kernel exploits, and demonstrates the critical nature of such vulnerabilities in mobile security contexts.
Mitigation strategies for CVE-2016-8436 primarily focus on immediate patching and system updates from device manufacturers, as Qualcomm released security patches specifically addressing this issue. Organizations and users should ensure that all devices running affected kernel versions receive the latest security updates from their respective vendors. The patch typically involves correcting the input validation mechanisms within the video driver and implementing proper bounds checking for all memory operations. Additionally, system administrators should consider implementing application whitelisting policies to limit the installation and execution of potentially malicious applications, as the vulnerability requires a local application to be present for exploitation. Network-level monitoring should also be enhanced to detect unusual kernel-level activity that might indicate exploitation attempts, and regular security assessments should be conducted to identify and remediate similar vulnerabilities in other device components.