CVE-2015-9020 in Android
Summary
by MITRE
In all Android releases from CAF using the Linux kernel, an untrusted pointer dereference vulnerability exists in the unlocking of memory.
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Analysis
by VulDB Data Team • 12/27/2020
The vulnerability identified as CVE-2015-9020 represents a critical memory safety issue affecting Android devices that utilize the Linux kernel from Code Aurora Forum. This flaw manifests as an untrusted pointer dereference condition that occurs during the memory unlocking process, creating a potential pathway for malicious exploitation. The vulnerability affects all Android releases that incorporate kernel components from the Code Aurora Forum, indicating a widespread impact across multiple device manufacturers and software versions.
This technical flaw operates at the kernel level where memory management operations are executed, specifically during the process of unlocking memory regions. The untrusted pointer dereference vulnerability arises when the system attempts to access memory addresses that have not been properly validated or sanitized. Such conditions typically occur when kernel code processes user-supplied data or external inputs without adequate verification mechanisms, leading to potential memory corruption scenarios.
The operational impact of CVE-2015-9020 extends beyond simple memory corruption, as it can potentially enable privilege escalation attacks and arbitrary code execution within the kernel space. Attackers who successfully exploit this vulnerability could gain elevated privileges on affected devices, potentially allowing them to bypass security controls, access sensitive data, or install malicious software. The nature of this vulnerability makes it particularly dangerous as it operates within the core memory management subsystem where critical system functions are handled.
From a cybersecurity perspective, this vulnerability aligns with CWE-476 which describes NULL pointer dereference conditions, and could potentially map to ATT&CK technique T1068 related to exploitation of remote services or system vulnerabilities. The vulnerability's impact is amplified by its presence in the Linux kernel components used by Android, making it a prime target for attackers seeking to compromise mobile devices at a fundamental level. Device manufacturers and security researchers have classified this issue as high severity due to its potential for enabling full system compromise.
Mitigation strategies for CVE-2015-9020 should prioritize immediate patch deployment from device manufacturers, as the vulnerability exists in core kernel components that require careful handling. System administrators should implement comprehensive monitoring for suspicious memory access patterns and ensure that all Android devices receive timely security updates. Additionally, defensive measures including kernel address space layout randomization and stack canaries should be enabled to reduce exploitability. The vulnerability underscores the importance of rigorous input validation in kernel code and highlights the need for continuous security auditing of core system components.