CVE-2019-20559 in Samsung
Summary
by MITRE
An issue was discovered on Samsung mobile devices with P(9.0) software. Gallery allows viewing of photos on the lock screen. The Samsung ID is SVE-2019-15055 (October 2019).
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Analysis
by VulDB Data Team • 10/04/2020
This vulnerability exists within Samsung's mobile gallery application on devices running Android 9.0 P release, representing a significant security flaw that compromises user privacy and device protection mechanisms. The issue stems from improper access control implementation that allows unauthorized viewing of photographic content directly from the lock screen interface, bypassing normal authentication requirements. This represents a critical failure in the device's security model where sensitive visual data remains accessible without proper user verification, creating an attack surface that violates fundamental security principles of mobile device protection.
The technical implementation flaw manifests through inadequate permission checking and access control enforcement within the gallery application's lock screen rendering functionality. When a user's device is locked, the system should enforce strict authentication requirements before allowing access to personal content, yet this vulnerability enables direct photo viewing without proper verification mechanisms. The flaw likely resides in the application's handling of media content display during lock screen states, where the security boundary between authenticated and unauthenticated access is improperly enforced. This issue falls under the category of inadequate access control as defined by CWE-284, specifically involving improper privilege management and access restriction enforcement.
The operational impact of this vulnerability extends beyond simple privacy concerns to potentially enable various malicious activities including social engineering attacks, identity theft, and targeted harassment. An attacker with physical access to a locked device can immediately view personal photographs, potentially extracting sensitive information about the user's activities, relationships, and locations. This exposure creates opportunities for phishing attacks, blackmail, and other forms of digital exploitation that leverage the intimate nature of personal photographic content. The vulnerability affects all Samsung devices running Android 9.0 P, representing a widespread risk across numerous device models and user bases.
The security implications align with multiple ATT&CK framework techniques including T1566 for credential harvesting through social engineering and T1087 for account access and enumeration. This vulnerability demonstrates how seemingly minor application-level flaws can create significant security risks by undermining the fundamental security model of mobile devices. The issue highlights the importance of proper security testing and access control validation during application development, particularly for components that handle sensitive user data. Organizations should implement comprehensive security assessments that include lock screen functionality testing and privilege validation checks to prevent similar issues.
Mitigation strategies should include immediate software updates from Samsung addressing the access control implementation flaw, followed by user education regarding device security practices and the importance of strong authentication mechanisms. System administrators should consider implementing additional security policies that enforce device encryption and screen lock requirements. The vulnerability underscores the necessity of regular security audits and penetration testing of mobile applications, particularly those handling sensitive user data. Organizations should also consider implementing mobile device management solutions that can enforce additional security controls beyond what is provided by the operating system itself.
This vulnerability represents a classic example of how insufficient access control implementation can compromise user privacy and device security. The flaw demonstrates the critical importance of maintaining proper security boundaries between authenticated and unauthenticated states, particularly in mobile environments where physical access to devices is common. The issue serves as a reminder that even minor application components can create significant security risks when proper security controls are not implemented, emphasizing the need for comprehensive security testing throughout the software development lifecycle.