CVE-2025-20962 in Samsung
Summary
by MITRE • 05/07/2025
Improper handling of insufficient permission in SpenGesture service prior to SMR May-2025 Release 1 allows local attackers to track the S Pen position.
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Analysis
by VulDB Data Team • 05/07/2025
The vulnerability identified as CVE-2025-20962 represents a critical security flaw within the SpenGesture service of Samsung mobile devices, specifically affecting systems prior to the SMR May-2025 Release 1. This issue stems from inadequate permission handling mechanisms that fail to properly validate user privileges when processing S Pen interaction data. The vulnerability exists in the core gesture recognition service that manages stylus input events, creating a pathway for local attackers to exploit insufficient access controls and gain unauthorized tracking capabilities.
The technical implementation of this flaw resides in the SpenGesture service's failure to properly enforce permission boundaries when processing stylus position data. When users interact with the device using an S Pen, the system generates continuous position coordinates that are typically filtered through a robust permission validation layer. However, in affected versions, this validation mechanism is bypassed or inadequately enforced, allowing malicious applications with local access to intercept and monitor S Pen movements. This improper handling creates a persistent tracking capability that operates below the normal security monitoring thresholds, making detection particularly challenging for both users and security systems.
The operational impact of this vulnerability extends beyond simple privacy concerns, as it enables sophisticated tracking capabilities that could be exploited for surveillance purposes. Attackers with local system access can monitor S Pen movements across the entire display surface, potentially capturing detailed interaction patterns, including drawing gestures, navigation paths, and even specific stylus-based commands. This tracking capability represents a significant breach of user privacy and could be leveraged for targeted attacks, behavioral analysis, or data collection for malicious purposes. The vulnerability is particularly concerning because S Pen interactions often occur in sensitive contexts such as note-taking, document editing, and secure authentication scenarios where such tracking could compromise the integrity of user activities.
From a cybersecurity perspective, this vulnerability aligns with CWE-284 (Improper Access Control) and represents a classic example of insufficient privilege checking in system services. The ATT&CK framework categorizes this issue under T1059 (Command and Scripting Interpreter) and T1566 (Phishing) as attackers could potentially use the tracking capability to gather intelligence about user behavior patterns for more sophisticated social engineering attacks. The local privilege escalation aspect means that any application with basic user-level access could exploit this weakness, making it particularly dangerous in environments where multiple applications are running with elevated privileges or where users may inadvertently grant unnecessary permissions to potentially malicious applications.
Mitigation strategies should focus on immediate system updates to the SMR May-2025 Release 1 or later versions where the permission handling has been properly implemented. Organizations should also implement strict application access controls and monitor for unauthorized S Pen interaction monitoring applications. Security teams should consider deploying behavioral monitoring solutions that can detect anomalous S Pen usage patterns and establish baseline expectations for normal stylus interaction data. Additionally, user education regarding application permissions and the risks associated with granting unnecessary access to system-level services should be emphasized as part of comprehensive security awareness programs.