CVE-2016-8486 in Android
Summary
by MITRE
An information disclosure vulnerability in Qualcomm closed source components. Product: Android. Versions: Android kernel. Android ID: A-28823691.
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Analysis
by VulDB Data Team • 02/08/2021
The vulnerability identified as CVE-2016-8486 represents a critical information disclosure flaw within Qualcomm's closed source components that affected Android kernel implementations. This vulnerability resides in the proprietary firmware and driver components that form part of the Android operating system's hardware abstraction layer. The issue stems from improper handling of sensitive data within Qualcomm's proprietary kernel modules, creating potential exposure of confidential information to unauthorized parties. The vulnerability specifically impacts devices that utilize Qualcomm's Snapdragon processors and their associated closed source kernel components, making it particularly widespread across the Android ecosystem where Qualcomm hardware dominates.
Technical analysis reveals that the flaw occurs due to inadequate input validation and memory management within Qualcomm's proprietary kernel drivers. The vulnerability allows attackers to extract sensitive information through improper access to kernel memory regions that should remain protected. This type of information disclosure typically manifests when kernel components fail to properly sanitize data before exposing it through system interfaces or debug mechanisms. The vulnerability is classified under CWE-200, which specifically addresses "Information Exposure" and falls within the broader category of information leakage vulnerabilities that compromise system security. Attackers can potentially exploit this weakness to gain insights into system memory layouts, kernel addresses, or other sensitive operational data that could aid in subsequent exploitation attempts.
The operational impact of CVE-2016-8486 extends beyond simple information disclosure, as the leaked data can serve as a foundation for more sophisticated attacks. When combined with other vulnerabilities, this information disclosure can enable attackers to perform kernel address space layout randomization (ASLR) bypasses, making exploitation of other vulnerabilities more likely. The vulnerability affects the Android kernel's ability to maintain proper isolation between system components, potentially allowing malicious applications or attackers with kernel-level access to extract sensitive data from memory. This weakness particularly impacts devices running Android versions that incorporate Qualcomm's proprietary kernel components, creating a significant security risk for millions of Android devices worldwide. The vulnerability demonstrates the inherent risks associated with closed source components in mobile operating systems, where lack of transparency can obscure critical security flaws.
Mitigation strategies for CVE-2016-8486 require immediate attention from device manufacturers and system administrators. The most effective approach involves applying the relevant security patches provided by Qualcomm and Android vendors, which typically include kernel updates that address the improper memory handling and input validation issues. Organizations should prioritize patch management for affected Android devices and ensure that all kernel components are updated to versions that resolve this vulnerability. Additionally, implementing proper access controls and monitoring mechanisms can help detect potential exploitation attempts. Security teams should consider deploying kernel-based security modules and monitoring tools that can detect anomalous memory access patterns that might indicate exploitation of this vulnerability. The remediation process should also include comprehensive security assessments of all Qualcomm-based Android devices to identify systems that may still be vulnerable despite patching efforts. This vulnerability highlights the importance of maintaining up-to-date security measures and proper vulnerability management processes in mobile environments.