CVE-2025-48579: Google Android Privilege Escalation Flaw

CVE-2025-48579 Overview

CVE-2025-48579 is a local privilege escalation vulnerability affecting Google Android's MediaProvider component. The flaw exists in multiple functions of MediaProvider.java, where a confused deputy vulnerability allows attackers to bypass external storage write permission restrictions. This vulnerability enables local privilege escalation without requiring any additional execution privileges or user interaction.

Critical Impact

A malicious application can exploit this vulnerability to gain unauthorized write access to external storage, potentially compromising user data integrity and enabling further privilege escalation on affected Android devices.

Affected Products

• Google Android 14.0
• Google Android 15.0
• Google Android 16.0

Discovery Timeline

• 2026-03-02 - CVE-2025-48579 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2025-48579

Vulnerability Analysis

This vulnerability is classified as a Confused Deputy attack (CWE-441), which occurs when a privileged program (the "deputy") is manipulated into misusing its authority on behalf of a malicious actor. In this case, the MediaProvider component acts as the confused deputy, holding elevated permissions to write to external storage that can be exploited by applications without proper storage permissions.

The vulnerability requires local access to exploit, meaning an attacker would need to install a malicious application on the target device. Once installed, the malicious app can leverage MediaProvider's privileged position to perform unauthorized writes to external storage without requesting or being granted the necessary permissions through Android's permission model.

The impact of successful exploitation is significant, as it affects confidentiality, integrity, and availability of data stored on the device's external storage. The attack complexity is low, and no user interaction is required for exploitation.

Root Cause

The root cause of this vulnerability lies in improper authorization validation within the MediaProvider component. When processing requests from other applications, MediaProvider fails to adequately verify whether the calling application has legitimate permissions to perform write operations on external storage. This creates a confused deputy scenario where MediaProvider uses its own elevated privileges to complete requests on behalf of unauthorized callers.

Attack Vector

The attack vector for CVE-2025-48579 is local, requiring an attacker to install a malicious application on the target Android device. The exploitation flow typically involves:

1. A malicious application is installed on the victim's Android device
2. The application sends crafted requests to MediaProvider
3. MediaProvider processes these requests using its own storage permissions
4. The malicious application gains write access to external storage without having the required permissions
5. The attacker can then modify, create, or delete files on external storage

This vulnerability does not require any special execution privileges or user interaction, making it particularly dangerous once a malicious application is installed.

Detection Methods for CVE-2025-48579

Indicators of Compromise

• Applications attempting to write to external storage paths without holding WRITE_EXTERNAL_STORAGE permission
• Unusual MediaProvider activity patterns from applications that shouldn't interact with external storage
• Unexpected file modifications in external storage directories by applications without appropriate permissions

Detection Strategies

• Monitor Android logcat for MediaProvider permission-related warnings or errors from untrusted applications
• Implement runtime permission monitoring to detect applications bypassing the normal permission flow
• Use mobile threat detection solutions to identify applications exhibiting confused deputy exploitation patterns
• Analyze application behavior for unauthorized cross-process communication with MediaProvider

Monitoring Recommendations

• Enable verbose logging for MediaProvider operations on test devices to identify exploitation attempts
• Deploy endpoint detection solutions capable of monitoring Android inter-process communication (IPC)
• Regularly audit installed applications for suspicious permission usage patterns
• Implement network-level monitoring for potential data exfiltration following privilege escalation

How to Mitigate CVE-2025-48579

Immediate Actions Required

• Update affected Android devices to the latest security patch level from the March 2026 Android Security Bulletin
• Review installed applications and remove any untrusted or unnecessary apps
• Enable Google Play Protect to detect potentially harmful applications
• Consider temporarily restricting installation of applications from unknown sources until patching is complete

Patch Information

Google has addressed this vulnerability in the Android Security Bulletin March 2026. Device manufacturers and carriers should apply the security patches and distribute updates to affected devices. Users should check for and install system updates as soon as they become available.

The patch corrects the authorization validation logic in MediaProvider to ensure proper permission checks are performed before allowing write operations to external storage.

Workarounds

• Limit installation of applications to trusted sources such as Google Play Store with Play Protect enabled
• Review and revoke unnecessary permissions from installed applications via Android Settings
• Consider using Android's Work Profile or device management solutions to isolate sensitive data
• Implement mobile device management (MDM) policies to enforce application whitelisting on enterprise devices

# Check current Android security patch level
adb shell getprop ro.build.version.security_patch

# List installed packages and their permissions for security audit
adb shell pm list packages -f
adb shell dumpsys package <package_name> | grep permission