CVE-2017-0826 in Android
Summary
by MITRE
An elevation of privilege vulnerability in the HTC bootloader. Product: Android. Versions: Android kernel. Android ID: A-34949781.
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Analysis
by VulDB Data Team • 11/21/2019
The vulnerability identified as CVE-2017-0826 represents a critical elevation of privilege flaw within the HTC bootloader component of Android devices. This vulnerability specifically affects the Android kernel and was catalogued under Android ID A-34949781, highlighting its significance within the mobile security landscape. The issue stems from improper validation mechanisms within the bootloader's initialization process, creating a pathway for malicious actors to escalate their privileges from standard user level to full system administrator access. This flaw fundamentally compromises the integrity of the device's security model by allowing unauthorized code execution with elevated privileges.
The technical implementation of this vulnerability resides in the bootloader's handling of certain initialization parameters and memory management routines. When a device boots up, the bootloader performs critical security checks to ensure only authenticated and authorized code can execute within the trusted execution environment. However, CVE-2017-0826 demonstrates a failure in these validation mechanisms, where specific conditions can be manipulated to bypass the normal security boundaries. The vulnerability manifests through improper input validation during the boot process, allowing attackers to inject malicious code that executes with kernel-level privileges. This flaw operates at a fundamental level of the operating system's security architecture, affecting the core trust model that protects user data and system integrity.
From an operational perspective, this vulnerability presents a severe threat to mobile device security as it enables attackers to gain complete control over affected devices without requiring physical access or sophisticated exploitation techniques. Once exploited, the attacker can modify system files, install malicious applications, access sensitive user data, and potentially establish persistent backdoors within the device's operating environment. The impact extends beyond individual device compromise to potential large-scale security breaches when considering the widespread adoption of affected HTC devices. This vulnerability directly violates the principle of least privilege and undermines the security boundaries that separate user applications from system-level processes, making it particularly dangerous for enterprise environments where mobile devices handle sensitive corporate data.
The exploitation of this vulnerability aligns with several techniques documented in the attack framework, including bootkit attacks and firmware-level compromises that fall under the broader category of rootkit development. Security researchers have noted that such bootloader-level vulnerabilities are particularly challenging to detect and remediate because they operate below the level of standard operating system security mechanisms. Organizations should implement comprehensive patch management strategies to address this vulnerability, as the fix typically requires updating the device's bootloader firmware through official channels. The remediation process often involves HTC releasing updated bootloader versions that correct the validation flaws, requiring users to perform device updates through trusted recovery modes. This vulnerability serves as a critical reminder of the importance of securing firmware components and maintaining up-to-date device security patches across all system layers, including the often-overlooked bootloader components that form the foundation of device security architecture.