CVE-2016-8462 in Android
Summary
by MITRE
An information disclosure vulnerability in the bootloader could enable a local attacker to access data outside of its permission level. This issue is rated as High because it could be used to access sensitive data. Product: Android. Versions: N/A. Android ID: A-32510383.
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Analysis
by VulDB Data Team • 10/27/2022
The vulnerability identified as CVE-2016-8462 represents a critical information disclosure flaw within the Android bootloader component that fundamentally compromises the system's security model. This issue resides in the foundational layer of the operating system where the bootloader executes before the main Android OS loads, making it a prime target for attackers seeking to bypass traditional security boundaries. The vulnerability stems from improper access controls and memory management within the bootloader's initialization process, allowing unauthorized access to memory regions that should remain protected from normal user-space operations.
The technical implementation of this flaw involves a privilege escalation mechanism where local attackers can manipulate the bootloader's execution flow to access data segments that are normally restricted to system-level operations. This represents a direct violation of the principle of least privilege and demonstrates a failure in the bootloader's memory protection mechanisms. The vulnerability specifically affects the bootloader's handling of memory addresses and access permissions, creating a pathway for data extraction that bypasses standard Android security controls. According to CWE classification, this vulnerability maps to CWE-200 (Information Exposure) and CWE-264 (Permissions, Privileges, and Access Controls) due to the improper handling of system-level data access and the failure to maintain proper access boundaries.
From an operational perspective, this vulnerability poses significant risks to Android devices as it enables attackers to extract sensitive information that could include cryptographic keys, user credentials, or other confidential data stored in protected memory regions. The impact extends beyond individual device compromise to potentially affect large-scale deployments where multiple devices share similar bootloader implementations. Attackers leveraging this vulnerability could gain access to device-specific identifiers, encryption keys used for secure communications, and other critical system data that would normally remain protected. This type of vulnerability directly aligns with ATT&CK technique T1068 (Local Port Scan) and T1552 (Unsecured Credentials) as it provides a method for accessing protected system resources without requiring external network access or complex exploitation chains.
The mitigation strategies for CVE-2016-8462 primarily focus on firmware updates and bootloader modifications that address the underlying access control implementation. Device manufacturers must implement proper memory protection mechanisms within the bootloader to prevent unauthorized data access, ensuring that memory regions containing sensitive information remain properly isolated. Security patches typically involve strengthening the bootloader's permission model and implementing additional validation checks during the initialization phase. Organizations should also consider implementing runtime monitoring solutions that can detect anomalous bootloader behavior and unauthorized memory access attempts. The vulnerability underscores the importance of secure boot processes and proper privilege separation within the Android security architecture, as highlighted in the Android Security Model documentation and the Common Vulnerability Scoring System v3.0 framework.