Package Validation Flaw in SystemUI Enables UI Spoofing

Executive Summary

An unprivileged app can exploit missing package or signature validation in SystemUI's RemoteQCController when handling a hardcoded content:// URI. This lets the attacker claim a specific authority if the legitimate package is not installed, inject fake UI elements into the trusted SystemUI Quick Controls panel, and potentially gain Background Activity Launch rights when the user interacts with the spoofed element.

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Impact Analysis

An attacker could trick you into interacting with fake UI elements in the system panel, potentially leading to unauthorized actions or granting the attacker elevated permissions like Background Activity Launch when you click the spoofed element.

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Mitigation Strategies

Apply the latest Android security updates to patch SystemUI's RemoteQCController. Monitor for unauthorized UI elements in the Quick Controls panel and restrict unprivileged applications from accessing content:// URIs.

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