CVE-2016-1852 in iOS
Summary
by MITRE
Siri in Apple iOS before 9.3.2 does not block data detectors within results in the lock-screen state, which allows physically proximate attackers to obtain sensitive contact and photo information via unspecified vectors.
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Analysis
by VulDB Data Team • 08/21/2022
The vulnerability identified as CVE-2016-1852 represents a significant security flaw in Apple iOS versions prior to 9.3.2, specifically affecting the Siri intelligent assistant functionality within the lock screen interface. This issue stems from insufficient access controls and data protection mechanisms that fail to properly isolate sensitive information when the device is locked. The vulnerability exists in the manner by which Siri processes and displays results on the lock screen, creating an unexpected information disclosure channel that bypasses normal device security boundaries.
The technical flaw manifests through the improper handling of data detectors within Siri's lock screen results, where the system fails to adequately filter or restrict access to sensitive information including contact details and photo metadata. This occurs because the lock screen interface maintains certain processing capabilities for Siri queries while simultaneously exposing data that should remain protected. Attackers exploiting this vulnerability can leverage proximity-based access to retrieve sensitive contact information and photo details without requiring authentication or explicit authorization. The unspecified vectors suggest that the attack could occur through various methods including direct physical access, network-based exploitation, or through the manipulation of Siri query parameters that trigger data display on the lock screen.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates a persistent security risk for iOS users who may not be aware of the exposure. Physically proximate attackers can exploit this weakness to gain unauthorized access to personal contact lists, photo metadata, and potentially other sensitive data stored on the device. This represents a violation of the fundamental security principle of least privilege, where information should only be accessible to authorized users with appropriate clearance levels. The vulnerability particularly affects users who leave their devices unlocked or who are in environments where physical proximity attacks are possible, creating a significant risk for both personal privacy and potential corporate data breaches.
This vulnerability aligns with CWE-200, which addresses "Information Exposure," and demonstrates the importance of proper input validation and access control mechanisms in mobile operating systems. The issue also relates to ATT&CK technique T1552.001, "Credentials in Files," as it involves unauthorized access to sensitive data that would typically be protected by proper file system permissions and access controls. The flaw represents a design-level security issue rather than a runtime vulnerability, indicating that the underlying architecture of the lock screen interface and Siri integration lacks proper security boundaries. Organizations should implement immediate mitigations including prompt OS updates to iOS 9.3.2 or later versions, along with user education regarding lock screen security practices and the importance of maintaining device security through regular updates.
The broader implications of this vulnerability highlight the challenges in securing mobile operating systems where multiple interfaces and services must coexist while maintaining appropriate security boundaries. Apple's implementation of the lock screen functionality failed to properly isolate sensitive data processing from public display mechanisms, creating an unexpected attack surface that could be exploited by adversaries with physical proximity to target devices. This vulnerability underscores the critical importance of comprehensive security testing for mobile platforms, particularly in areas where user interfaces must balance usability with security requirements. The remediation approach focuses on addressing the root cause through proper access control implementation and ensuring that all data processing activities on the lock screen maintain appropriate security boundaries to prevent unauthorized information disclosure.