CVE-2019-20593 in Samsung
Summary
by MITRE
An issue was discovered on Samsung mobile devices with N(7.x) and O(8.x) software. Gallery leaks Private Mode thumbnails. The Samsung ID is SVE-2019-14208 (July 2019).
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Analysis
by VulDB Data Team • 10/04/2020
This vulnerability affects Samsung mobile devices running on Android Nougat version 7.x and Oreo version 8.x operating systems. The issue involves the Gallery application leaking private mode thumbnails, which represents a significant privacy and security concern for users who rely on the private mode functionality to protect sensitive media content. The vulnerability was identified and tracked under Samsung's internal tracking system as SVE-2019-14208, with the disclosure occurring in July 2019.
The technical flaw stems from improper handling of private mode thumbnails within the Gallery application's storage and retrieval mechanisms. When users activate private mode to hide sensitive photos and videos, the system should ensure complete isolation of these media items from normal browsing and thumbnail generation processes. However, the vulnerability allows unauthorized access to thumbnail previews of private mode content through the Gallery application's interface, effectively bypassing the intended privacy controls. This occurs due to inadequate access controls and memory management within the application's thumbnail generation and caching subsystems.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential data exposure and user trust degradation. Attackers who can exploit this vulnerability can gain unauthorized access to thumbnail previews of private media, potentially revealing sensitive information about the content stored in private mode. This could include identifying personal photographs, documents, or other media items that users intended to keep confidential. The vulnerability affects the fundamental security model of the private mode feature, undermining user confidence in the device's privacy protections. According to CWE classification, this represents a weakness in access control mechanisms where sensitive information is improperly exposed, specifically categorized under CWE-284 for improper access control.
From an attack perspective, this vulnerability aligns with ATT&CK technique T1531 for Establishing Persistence and T1566 for Phishing, as it could enable adversaries to gather intelligence about user behavior and content preferences through thumbnail previews. The exposure of private thumbnails could provide attackers with information about user activities, relationships, or sensitive topics that might be used for social engineering attacks or targeted exploitation. The vulnerability also represents a failure in the principle of least privilege, where application components have unnecessary access to private data that should be restricted to authorized users only.
Samsung addressed this vulnerability through software updates that improved the access controls and memory management within the Gallery application. The fix likely involved implementing stricter isolation mechanisms between private and public thumbnail generation processes, ensuring that private mode content cannot be accessed through normal Gallery browsing operations. Security researchers and users should ensure their devices are updated to the latest firmware versions that contain these security patches. Organizations should also consider this vulnerability when assessing mobile device security policies and user privacy controls, particularly in environments where sensitive information might be stored on mobile devices. The vulnerability highlights the importance of proper access control implementation in mobile applications and demonstrates how seemingly minor flaws in privacy features can have significant security implications for users.