CVE-2016-3848 in Android
Summary
by MITRE
The NVIDIA media driver in Android before 2016-08-05 on Nexus 9 devices allows attackers to gain privileges via a crafted application, aka internal bug 28919417.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 03/20/2019
The vulnerability identified as CVE-2016-3848 represents a critical privilege escalation flaw within the NVIDIA media driver component of Android operating systems. This issue specifically affected Nexus 9 devices and remained unpatched until the 2016-08-05 security update cycle. The vulnerability stems from improper input validation and access control mechanisms within the media driver subsystem, which is responsible for handling multimedia processing tasks including video decoding and graphics rendering operations. The flaw enables malicious applications to exploit kernel-level components and elevate their privileges to system-level access, bypassing normal security boundaries that should protect the Android operating system from unauthorized access.
The technical implementation of this vulnerability involves a buffer overflow or memory corruption issue within the NVIDIA media driver's handling of specific multimedia commands or data structures. Attackers can craft malicious applications that manipulate the driver's processing routines to execute arbitrary code with elevated privileges. This typically occurs through improper bounds checking when the driver processes specially crafted multimedia content or API calls. The vulnerability falls under the CWE-119 weakness category, which encompasses memory safety issues including buffer overflows, and aligns with ATT&CK technique T1068, which describes "Exploitation for Privilege Escalation" by leveraging system vulnerabilities to gain elevated access rights. The media driver component in question operates at a privileged kernel level, making successful exploitation particularly dangerous as it can provide attackers with complete control over device functions including access to sensitive user data, camera, microphone, and network communications.
The operational impact of CVE-2016-3848 extends beyond simple privilege escalation to encompass comprehensive device compromise and data exfiltration capabilities. Once an attacker achieves system-level privileges through this vulnerability, they can manipulate device settings, install malicious applications, monitor user activities, and access protected storage areas containing personal information, credentials, and confidential communications. The vulnerability's targeting of the Nexus 9 platform creates a significant concern for users of this specific device line, as the flaw remained present across multiple Android versions until the August 2016 security patch. The affected driver component handles critical multimedia functions that are frequently accessed by legitimate applications, making the exploitation vector particularly stealthy and difficult to detect through normal security monitoring. This vulnerability also demonstrates the inherent risks associated with vendor-specific kernel modules and the importance of proper input validation in system-level drivers, as the flaw could potentially be leveraged for more sophisticated attacks including persistent backdoor installation and lateral movement within network environments.
Mitigation strategies for CVE-2016-3848 primarily focus on applying the official Android security patches released in August 2016, which addressed the underlying privilege escalation mechanism within the NVIDIA media driver. Organizations and individuals should ensure their Nexus 9 devices receive the complete security update package that includes kernel-level fixes for the affected driver components. Additionally, security professionals should implement monitoring for suspicious application behavior that might indicate exploitation attempts, particularly focusing on unusual multimedia processing activities or unauthorized privilege escalation events. The vulnerability highlights the importance of maintaining up-to-date device firmware and operating system versions, as well as implementing application whitelisting policies to prevent installation of potentially malicious applications. Network security teams should also consider implementing device integrity monitoring to detect unauthorized changes to system components and ensure that device security patches are properly applied and verified across all affected platforms. The remediation process requires careful attention to the specific patching procedures recommended by Google and NVIDIA to avoid potential system instability or boot failures that could occur from improper patch application.