CVE-2019-20597 in Samsung
Summary
by MITRE
An issue was discovered on Samsung mobile devices with N(7.1), O(8.x), and P(9.0) software. SPENgesture allows arbitrary applications to read or modify user-input logs. The Samsung ID is SVE-2019-14170 (June 2019).
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Analysis
by VulDB Data Team • 10/04/2020
The vulnerability identified as CVE-2019-20597 represents a significant security flaw within Samsung mobile devices running Android versions 7.1, 8.x, and 9.0. This issue specifically affects the SPENgesture functionality which is integral to Samsung's stylus-based input system. The vulnerability stems from improper access controls and privilege escalation mechanisms within the system's gesture recognition framework. The SPENgesture component is designed to process stylus input and gesture recognition, but it fails to properly validate or restrict access to user input logs, creating a dangerous security gap that allows malicious applications to exploit this functionality.
The technical flaw manifests through a lack of proper authorization checks when accessing user input logs within the SPENgesture system. This vulnerability falls under the CWE-284 access control weakness category, specifically related to insufficient privileges and improper access control mechanisms. Attackers can leverage this flaw to gain unauthorized access to sensitive user input data, including keystrokes, touch patterns, and stylus-based gestures that users perform on their devices. The vulnerability is particularly concerning because it allows arbitrary applications to read or modify these logs without proper user consent or system authorization, effectively bypassing the normal security boundaries that should protect user input data.
The operational impact of this vulnerability extends beyond simple data theft, as it creates a persistent threat vector for attackers to monitor and potentially manipulate user interactions with their devices. This capability enables sophisticated attacks such as keylogging, gesture-based credential theft, and comprehensive user behavior tracking. The vulnerability affects millions of Samsung devices and represents a fundamental flaw in the device's security architecture. From an adversary perspective, this vulnerability maps directly to ATT&CK technique T1056.001 for input capture through keylogging capabilities, while also enabling techniques for credential access and data collection. The ability to modify user input logs additionally provides attackers with potential for data manipulation and system integrity compromise.
Mitigation strategies for this vulnerability require immediate patching of affected Samsung devices through official firmware updates, as well as implementation of runtime monitoring for suspicious access patterns to input logs. Organizations should implement mobile device management policies that restrict application permissions and monitor for unauthorized access to sensitive system components. The vulnerability highlights the critical importance of proper privilege separation and access control mechanisms in mobile operating systems, particularly for components that handle sensitive user input data. Security teams should conduct thorough vulnerability assessments of mobile device ecosystems and ensure that all input processing components maintain proper isolation and authorization controls. Additionally, users should be educated about the risks of installing untrusted applications that might exploit such vulnerabilities, and organizations should consider implementing network-level monitoring to detect potential exploitation attempts.