CVE-2018-21048

Vulnerability

An issue exists in Samsung mobile devices running O(8.x) (Android 8.x) software. The vulnerability occurs in Standalone Dex mode, where notifications are accessible even when the device is locked. This condition allows the contents of notifications to be viewed without proper authentication.

Exploitation

An attacker with physical access to a locked Samsung device in Standalone Dex mode can view notifications without unlocking the device. The attacker only needs to interact with the locked screen; no authentication or special privileges are required. The notification content is displayed due to a flaw in the Dex mode's handling of the lock screen state.

Impact

Successful exploitation leads to information disclosure of notification contents, which may include sensitive data such as message text, email previews, or app alerts. The attacker gains this information without bypassing the device lock, effectively compromising confidentiality without triggering any unlock attempt. The privilege level achieved is that of a user with physical access to the locked device.

Mitigation

As of the available references, no specific patch or mitigation is explicitly detailed. Samsung assigned the identifier SVE-2018-12925 to this issue in November 2018. Users should ensure their devices receive the latest security updates from Samsung and check the Samsung Mobile Security portal for any related advisories. Until a fix is confirmed, users should disable Standalone Dex mode when the device is unattended to reduce the risk.