CVE-2014-4354 in iOS
Summary
by MITRE
Apple iOS before 8 enables Bluetooth during all upgrade actions, which makes it easier for remote attackers to bypass intended access restrictions via a Bluetooth session.
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Analysis
by VulDB Data Team • 02/16/2022
The vulnerability described in CVE-2014-4354 represents a critical security flaw in Apple iOS versions prior to 8.0 where the operating system maintains Bluetooth connectivity during all upgrade processes regardless of user configuration or security settings. This behavior creates an unintended attack surface that allows remote adversaries to establish Bluetooth sessions and potentially bypass access controls that would normally be enforced during system updates. The flaw exists at the system-level implementation of Bluetooth management during upgrade operations, where the device fails to properly isolate or disable wireless communication channels that could be exploited by malicious actors. This vulnerability directly impacts the principle of least privilege and proper system isolation during critical operations.
The technical implementation of this flaw stems from the iOS upgrade mechanism's failure to properly manage Bluetooth radio states during firmware updates. When a device attempts to upgrade its operating system, the Bluetooth subsystem remains active and accessible, creating a window of opportunity for attackers to initiate unauthorized connections. This behavior violates standard security practices outlined in the Common Weakness Enumeration catalog under CWE-665, which addresses improper initialization of resources and improper handling of communication channels. The vulnerability essentially provides attackers with a persistent entry point that remains active throughout the entire upgrade process, even when the device should be in a secure state.
The operational impact of this vulnerability extends beyond simple Bluetooth access, as it enables attackers to potentially execute arbitrary code, perform man-in-the-middle attacks, or gain unauthorized access to device functions during upgrade operations. This creates a significant risk for enterprise environments where iOS devices may be targeted during routine maintenance cycles, as attackers can exploit this window to compromise devices before or during security updates. The vulnerability also aligns with ATT&CK technique T1046 which describes the use of network service scanning to identify active services, and T1059 which involves the execution of commands through system interfaces. Attackers can leverage this flaw to establish persistent Bluetooth connections that remain active during upgrade processes, potentially enabling data exfiltration or further compromise of the device.
Mitigation strategies for this vulnerability require immediate implementation of iOS version 8.0 or later where Apple addressed the Bluetooth handling during upgrade operations. Organizations should conduct comprehensive device inventory assessments to identify all affected iOS versions and implement mandatory upgrade policies. Network administrators should also consider implementing Bluetooth access controls at the enterprise level, though this becomes less effective if the vulnerability exists at the operating system level. The fix implemented by Apple involved modifying the upgrade process to properly disable Bluetooth functionality during upgrade operations, ensuring that the device maintains its security posture throughout the entire update lifecycle. This remediation aligns with security best practices for system hardening and demonstrates the importance of proper resource management during critical system operations.