CVE-2024-0015: Google Android Privilege Escalation Flaw

CVE-2024-0015 Overview

CVE-2024-0015 is a local privilege escalation vulnerability in Google Android's DreamService component. The flaw exists in the convertToComponentName method of DreamService.java, where improper handling of intent redirection allows an attacker to launch arbitrary protected activities. This vulnerability enables local privilege escalation without requiring user interaction, making it particularly dangerous for compromised or malicious applications running with standard user execution privileges.

Critical Impact

A local attacker can exploit this intent redirection flaw to escalate privileges and launch protected activities that should be inaccessible, potentially gaining elevated system access on affected Android devices.

Affected Products

• Google Android 11.0
• Google Android 12.0
• Google Android 12.1
• Google Android 13.0

Discovery Timeline

• 2024-01-01 - Google releases security patch in Android Security Bulletin January 2024
• 2024-02-16 - CVE-2024-0015 published to NVD
• 2025-03-14 - Last updated in NVD database

Technical Details for CVE-2024-0015

Vulnerability Analysis

The vulnerability resides in the convertToComponentName function within Android's DreamService.java file. The DreamService is part of Android's framework for handling screen saver ("dream") functionality. The flaw stems from improper validation when processing component names, which creates an intent redirection vulnerability.

Intent redirection vulnerabilities in Android occur when an application or system component forwards intents without properly validating their targets. In this case, the convertToComponentName method fails to adequately verify the destination component, allowing an attacker to craft malicious inputs that redirect intents to protected activities that would normally be inaccessible.

The exploitation requires local access with user execution privileges. Once exploited, an attacker can leverage the DreamService's elevated permissions to launch activities that are protected by Android's permission system, effectively bypassing security boundaries.

Root Cause

The root cause is improper validation in the convertToComponentName method of DreamService.java. The function does not adequately sanitize or verify component name inputs before using them to construct and launch intents. This allows malicious component specifications to redirect intent delivery to protected activities outside the intended scope of the DreamService.

This vulnerability is classified under CWE-280 (Improper Handling of Insufficient Permissions or Privileges), as the flaw allows operations to be performed with permissions that exceed what the calling context should have.

Attack Vector

The attack vector is local, requiring the attacker to have code execution capability on the target Android device. This could be achieved through a malicious application installed on the device or by exploiting another vulnerability to gain initial code execution.

The attack flow involves:

1. A malicious application running with standard user privileges
2. The application crafts a specially formed component name or intent
3. This input is processed by the vulnerable convertToComponentName method
4. The DreamService redirects the intent to a protected activity
5. The protected activity is launched with elevated privileges, bypassing normal security restrictions

No user interaction is required for exploitation, which increases the severity as the attack can be automated once the malicious application is installed on the device.

Detection Methods for CVE-2024-0015

Indicators of Compromise

• Unexpected activity launches from the DreamService component
• Anomalous intent traffic originating from com.android.systemui or dream-related services
• Unauthorized access to protected activities logged in system event logs
• Applications attempting to interact with DreamService APIs outside normal screen saver contexts

Detection Strategies

• Monitor Android system logs for unusual DreamService activity or unexpected protected activity launches
• Implement application behavior analysis to detect apps attempting to abuse the DreamService component
• Review installed applications for suspicious intent filter declarations targeting DreamService
• Deploy mobile threat defense solutions capable of detecting privilege escalation attempts

Monitoring Recommendations

• Enable verbose logging for DreamService components during security assessments
• Monitor for applications requesting or interacting with dream-related permissions unexpectedly
• Implement endpoint detection and response (EDR) solutions on managed Android devices
• Review application installation sources and restrict side-loading on enterprise devices

How to Mitigate CVE-2024-0015

Immediate Actions Required

• Update affected Android devices to the security patch level of 2024-01-01 or later
• Review installed applications and remove any suspicious or untrusted software
• Enable Google Play Protect on all Android devices
• For enterprise environments, enforce minimum security patch levels through MDM solutions

Patch Information

Google has addressed this vulnerability in the Android Security Bulletin January 2024. The fix is available in the Android source code commit 2ce1b7fd37273ea19fbbb6daeeaa6212357b9a70.

The patch adds proper validation to the convertToComponentName method to prevent intent redirection attacks. Device manufacturers and carriers should incorporate this patch into their firmware updates. End users should apply security updates as they become available from their device manufacturer.

Workarounds

• Restrict application installation to trusted sources (Google Play Store) to reduce the risk of malicious applications
• Disable screen saver (dream) functionality if not required, reducing the attack surface
• Implement application allowlisting on enterprise devices to prevent unauthorized applications from running
• Use mobile device management (MDM) solutions to enforce security policies and monitor device compliance