CVE-2016-10333 in Android
Summary
by MITRE
In all Android releases from CAF using the Linux kernel, a sensitive system call was allowed to be called by HLOS.
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Analysis
by VulDB Data Team • 12/27/2020
The vulnerability identified as CVE-2016-10333 represents a critical security flaw within the Android operating system ecosystem, specifically affecting versions that utilize the Linux kernel through the Code Aurora Forum CAF framework. This issue stems from an improper privilege control mechanism that allows unauthorized access to sensitive system calls from the Host Linux Operating System (HLOS) context. The vulnerability specifically impacts the kernel-level security model where certain privileged operations should remain restricted to kernel space but are inadvertently exposed to user-space processes within the HLOS environment.
The technical implementation of this flaw involves a breakdown in the kernel's security boundaries where system calls that should only be executable from kernel mode are accessible from the HLOS layer. This represents a violation of the principle of least privilege and demonstrates a failure in the kernel's access control mechanisms. The vulnerability is categorized under CWE-276, which deals with incorrect permissions for critical resources, and specifically relates to improper privilege management within kernel space. The flaw essentially creates a pathway for malicious code running in HLOS to execute privileged operations that should remain restricted, potentially enabling arbitrary code execution and privilege escalation attacks.
From an operational perspective, this vulnerability exposes Android devices to significant risks including unauthorized system modifications, data theft, and complete device compromise. Attackers can exploit this weakness to gain elevated privileges and execute malicious code with kernel-level permissions, effectively bypassing the security model that protects the Android operating system. The impact extends beyond simple privilege escalation as it can enable persistent backdoors, rootkit installations, and complete system takeover. This vulnerability aligns with ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation," and represents a critical entry point for advanced persistent threats targeting mobile platforms.
The mitigation strategies for CVE-2016-10333 require immediate patching of affected Android versions through security updates provided by device manufacturers and Google. Organizations should implement comprehensive vulnerability management processes to ensure timely deployment of security patches across all Android devices in their environment. The fix typically involves strengthening the kernel's privilege control mechanisms and ensuring proper isolation between HLOS and kernel space operations. Additionally, security monitoring should be enhanced to detect unauthorized system call patterns and potential exploitation attempts. Device manufacturers should also consider implementing additional runtime protections and kernel hardening measures to prevent similar vulnerabilities from occurring in future versions. The vulnerability serves as a reminder of the critical importance of maintaining secure kernel interfaces and proper privilege separation in mobile operating systems.