CVE-2016-7597 in iOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.2 is affected. The issue involves the "SpringBoard" component, which allows physically proximate attackers to maintain the unlocked state via vectors related to Handoff with Siri.
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Analysis
by VulDB Data Team • 10/05/2022
The vulnerability identified as CVE-2016-7597 represents a significant security flaw in Apple's iOS operating system affecting versions prior to 10.2. This issue resides within the SpringBoard component, which serves as the core user interface framework responsible for managing the home screen, application launching, and system-level interactions. The vulnerability specifically exploits the Handoff functionality combined with Siri integration, creating an unexpected attack vector that undermines the device's security model. The flaw allows attackers who are physically present near a target device to maintain access to an unlocked state through carefully crafted Handoff interactions with Siri, bypassing normal security protocols that should enforce device lock states.
The technical implementation of this vulnerability stems from insufficient validation of Handoff requests when Siri is engaged. When a user initiates Handoff with Siri while their device is unlocked, the system fails to properly authenticate subsequent requests that could maintain the unlocked state without proper user interaction. This creates a scenario where an attacker with physical proximity can exploit the Handoff protocol to keep the device in an unlocked state, effectively maintaining persistent access to the device's contents. The vulnerability operates at the system level rather than application level, making it particularly dangerous as it can be exploited across multiple applications and system functions without requiring additional privileges or complex attack chains. The flaw demonstrates a critical failure in the security boundaries between system components, specifically how Handoff and Siri interfaces interact with the device's lock state management mechanisms.
From an operational perspective, this vulnerability significantly impacts device security and user privacy by allowing attackers to maintain unauthorized access to unlocked devices through simple physical proximity. The attack requires minimal technical expertise and can be executed using standard iOS devices, making it particularly concerning for users in public spaces or environments where physical access to devices is possible. The vulnerability essentially creates a backdoor that can be maintained indefinitely as long as the attacker remains in proximity, potentially allowing access to sensitive data, applications, and system functions that should only be available when the device is properly secured. This represents a fundamental breach in the device's security model, as it allows persistent access without requiring authentication or exploitation of other vulnerabilities. The impact extends beyond simple data theft to potential system compromise and unauthorized access to personal information stored on the device.
The security implications of CVE-2016-7597 align with CWE-284 Access Control Issues, specifically addressing inadequate access control mechanisms that allow unauthorized access to system resources. The vulnerability also maps to ATT&CK technique T1546.001 Exploitation for Privilege Escalation, as it enables attackers to maintain access to elevated privileges through system-level interactions. Additionally, this flaw demonstrates characteristics of T1059 Command and Scripting Interpreter, as the attack leverages legitimate system interfaces to maintain access. Organizations and users should prioritize immediate remediation by updating to iOS 10.2 or later versions where Apple has implemented proper validation of Handoff requests and enhanced authentication checks for system-level interactions. The vulnerability highlights the importance of comprehensive security testing for integrated system components and proper validation of cross-component interactions, particularly those involving user-facing interfaces and system-level services. Security teams should implement monitoring for unusual Handoff activity patterns and ensure that device security policies are properly enforced even when legitimate user interactions occur through integrated services.