CVE-2022-20470

What it actually does

Improper input validation in bindRemoteViewsService of AppWidgetServiceImpl.java allows bypassing background activity launch restrictions, enabling a local attacker to trigger privileged operations without additional permissions.

Why it matters to the business

Attackers with an installed app can silently escalate to full device control, risking data theft, persistence, or further compromise on affected Android devices; high ecosystem prevalence amplifies exposure across consumer and enterprise fleets.

How an attack unfolds

An attacker crafts a malicious app that invokes bindRemoteViewsService with invalid parameters to bypass Android's background launch checks, directly achieving local privilege escalation to access protected components.

How to fix it

Apply the latest Android security patches addressing A-234013191; upgrade to patched releases for Android 10 through 13 where available, as no specific fixed versions are listed.

How to confirm the fix worked

Verify devices are running a patched Android build containing the fix for improper input validation in AppWidgetServiceImpl; test by attempting background launch operations from unprivileged contexts and confirm enforcement.

Typical attack path

1. Develop and distribute a malicious app that requests only normal permissions
2. Trigger bindRemoteViewsService call with specially crafted RemoteViews intent
3. Bypass background activity launch restrictions via missing validation
4. Escalate to perform privileged actions such as launching restricted components or accessing sensitive data

How to detect it

Review system logs for bindRemoteViewsService invocations with anomalous intents; inspect app widget service audit trails for unexpected background activity launches from low-privilege callers.

What your security team should do

• Prioritize patching all Android 10-13 devices due to local escalation potential
• Monitor for unusual app widget binding attempts in device logs
• Enforce app vetting policies to limit sideloading of untrusted applications