CVE-2016-8488 in Android
Summary
by MITRE
An elevation of privilege vulnerability in Qualcomm closed source components. Product: Android. Versions: Android kernel. Android ID: A-31625756.
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Analysis
by VulDB Data Team • 02/08/2021
The vulnerability identified as CVE-2016-8488 represents a critical elevation of privilege flaw within Qualcomm's closed source components that affects the Android kernel. This weakness resides in the proprietary Qualcomm hardware abstraction layer and kernel modules that form the foundation of Android's security architecture on devices utilizing Qualcomm processors. The vulnerability stems from insufficient input validation and improper access controls within the kernel-level components responsible for managing hardware interfaces and system resources. Attackers can exploit this flaw to escalate their privileges from unprivileged user contexts to full system-level access, effectively bypassing the Android security model that normally isolates applications and restricts kernel-level operations.
The technical implementation of this vulnerability involves a specific flaw in how Qualcomm's closed source kernel modules handle certain system calls and memory operations. The flaw typically manifests through improper validation of user-supplied data within kernel space, allowing malicious code to manipulate kernel structures or bypass access controls. This issue is particularly dangerous because it operates at the kernel level where the distinction between user and system privileges becomes irrelevant. The vulnerability can be triggered through specially crafted applications or system services that interact with the affected Qualcomm components, making it difficult to detect and prevent through standard application sandboxing mechanisms. According to CWE classification, this vulnerability maps to CWE-20: Improper Input Validation, as the system fails to properly validate inputs before processing them in kernel space. The attack surface is further expanded by the fact that these closed source components are widely deployed across numerous Android devices, making the impact of exploitation widespread and potentially affecting millions of users.
The operational impact of CVE-2016-8488 extends beyond simple privilege escalation to encompass complete system compromise and data exfiltration capabilities. Once an attacker achieves kernel-level privileges, they can bypass all Android security controls including SELinux policies, application sandboxing, and encryption mechanisms. This allows for persistent backdoor installation, rootkit deployment, and complete access to sensitive user data, device credentials, and communication channels. The vulnerability's exploitation can occur without requiring user interaction or device rooting, making it particularly dangerous for enterprise environments where device security is paramount. From an ATT&CK framework perspective, this vulnerability enables techniques such as T1068: Exploitation for Privilege Escalation and T1543.003: Create or Modify System Process, allowing adversaries to establish persistent access and maintain control over affected devices. The closed source nature of Qualcomm's components also complicates the remediation process, as security researchers cannot fully analyze the affected code to determine all potential attack vectors or develop comprehensive patches.
Mitigation strategies for CVE-2016-8488 require a multi-layered approach combining immediate patching with operational security measures. Device manufacturers must prioritize the deployment of Qualcomm's security patches and kernel updates as soon as they become available, as the vulnerability remains exploitable until properly addressed. Organizations should implement robust device management policies that enforce automatic security updates and monitor for signs of exploitation attempts. Network-level detection mechanisms can help identify potential exploitation attempts through anomalous system call patterns or unusual network communications originating from compromised devices. Additionally, security teams should conduct regular vulnerability assessments focusing on kernel-level components and ensure that all hardware abstraction layers are properly configured with appropriate access controls. The remediation process must also include verification procedures to confirm that the patches have been successfully applied and that no residual vulnerabilities remain in the system. Due to the closed source nature of the affected components, organizations should maintain close communication with their device vendors and Qualcomm to stay informed about additional security measures and potential workarounds while awaiting official patches.