CVE-2023-21486 in Smart Phone
Summary
by MITRE • 05/05/2023
Improper export of android application components vulnerability in ImagePreviewActivity in Call Settings to SMR May-2023 Release 1 allows physical attackers to access some media data stored in sandbox.
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Analysis
by VulDB Data Team • 09/16/2025
The vulnerability identified as CVE-2023-21486 represents a critical security flaw in the Android application component export mechanism within the ImagePreviewActivity of Call Settings functionality. This issue specifically affects the SMR May-2023 Release 1 and stems from improper handling of application component exports that should typically be restricted to internal application use only. The vulnerability falls under the category of improper access control and component exposure, which directly violates fundamental security principles of Android application sandboxing and privilege separation. According to CWE-284, this represents an inadequate access control mechanism where application components are unnecessarily exposed to external entities, creating potential attack vectors for malicious actors.
The technical flaw manifests when the ImagePreviewActivity component fails to properly restrict its export status, allowing unauthorized external applications to invoke this activity and potentially access media data stored within the application's sandboxed environment. This improper export configuration creates a pathway for physical attackers to exploit the vulnerability by directly interacting with the exposed component, bypassing normal application security boundaries. The attack surface expands significantly as the vulnerability enables unauthorized data access without proper authentication or authorization checks, particularly affecting media data that should remain protected within the application's secure sandboxed storage.
Operationally, this vulnerability poses substantial risks to user privacy and data security as physical attackers with access to the device can leverage the exposed component to extract sensitive media content from the application's protected storage areas. The impact extends beyond simple data theft to potential information disclosure that could reveal personal communications, call-related media, or other sensitive information stored within the application's sandbox environment. This vulnerability directly impacts the Android security model's principle of least privilege, where components should only be accessible to authorized applications and users with appropriate permissions, as outlined in the Android security architecture guidelines and referenced in ATT&CK technique T1059 for component exploitation.
Mitigation strategies should focus on implementing proper component export restrictions through careful configuration of the AndroidManifest.xml file, ensuring that ImagePreviewActivity and similar components are properly marked with appropriate intent filters and export permissions. Security hardening measures include removing unnecessary component exports, implementing robust permission checks, and utilizing Android's built-in security mechanisms such as the android:exported attribute with appropriate values. Organizations should also conduct comprehensive security reviews of all application components to identify and remediate similar exposure issues, following the principle of defense in depth as recommended by industry security frameworks and standards. Regular security assessments and penetration testing should be implemented to verify that component exposure configurations maintain appropriate security boundaries and prevent unauthorized access to sensitive application data.