CVE-2025-0086: Google Android Auth Bypass Vulnerability

CVE-2025-0086 Overview

CVE-2025-0086 is a Missing Authorization vulnerability (CWE-862) affecting Google Android's AccountManagerService.java. The flaw exists in the onResult method where a missing permission check allows attackers to overwrite authentication tokens, leading to local information disclosure. This vulnerability requires no user interaction and can be exploited without additional execution privileges.

Critical Impact

Local attackers can overwrite authentication tokens without proper authorization, potentially exposing sensitive account information and credentials stored on affected Android devices.

Affected Products

• Google Android 12.0
• Google Android 12.1
• Google Android 13.0
• Google Android 14.0
• Google Android 15.0

Discovery Timeline

• 2025-08-26 - CVE-2025-0086 published to NVD
• 2025-09-02 - Last updated in NVD database

Technical Details for CVE-2025-0086

Vulnerability Analysis

This vulnerability stems from a Missing Authorization flaw (CWE-862) in Android's AccountManagerService.java component. The onResult callback method fails to properly validate that the calling process has the necessary permissions to modify authentication tokens. This architectural oversight allows any local application to invoke the vulnerable code path and overwrite authentication tokens belonging to other applications or system accounts.

The attack surface is local, requiring the attacker to have code execution on the target device. However, the barrier to exploitation is low since no special privileges are required and no user interaction is necessary. The primary impact is confidentiality-focused, allowing unauthorized access to sensitive authentication data.

Root Cause

The root cause is a missing permission check in the onResult method of AccountManagerService.java. When processing authentication results, the service fails to verify that the caller has appropriate authorization to modify the target account's authentication tokens. This represents a classic authorization bypass where the system assumes trust in callers without explicit validation.

Attack Vector

The attack vector is local, requiring the attacker to execute code on the target Android device. A malicious application installed on the device could exploit this vulnerability to:

1. Intercept or modify authentication tokens belonging to other applications
2. Access sensitive account information without proper authorization
3. Potentially hijack authenticated sessions for accounts managed by the AccountManagerService

The vulnerability does not require user interaction, meaning a background service or silently installed application could exploit the flaw without any visible indicators to the device owner.

Since no verified code examples are available, the exploitation mechanism involves calling the onResult method through Android's IPC mechanisms without proper permission checks being enforced. The technical details of the fix can be reviewed in the Android Source Code Commit.

Detection Methods for CVE-2025-0086

Indicators of Compromise

• Unexpected modifications to account authentication tokens in AccountManagerService logs
• Applications accessing account data they are not authorized to manage
• Unusual IPC calls to AccountManagerService from untrusted applications
• Authentication token changes without corresponding user-initiated authentication flows

Detection Strategies

• Monitor Android system logs for unauthorized AccountManagerService access attempts
• Implement application behavior analysis to detect apps attempting to access accounts they don't own
• Review installed applications for suspicious permission requests or behaviors related to account management
• Deploy mobile threat detection solutions that can identify exploitation attempts targeting system services

Monitoring Recommendations

• Enable verbose logging for AccountManagerService on managed devices during incident investigation
• Configure security monitoring solutions to alert on anomalous account-related system calls
• Regularly audit device accounts for unauthorized token modifications or access patterns

How to Mitigate CVE-2025-0086

Immediate Actions Required

• Apply the Android Security Patch Level 2025-03-01 or later to all affected devices
• Review installed applications and remove any untrusted or unnecessary apps that could exploit this vulnerability
• Enable Google Play Protect to help identify potentially harmful applications
• Consider restricting app installation to trusted sources only on managed devices

Patch Information

Google has addressed this vulnerability in the Android Security Bulletin March 2025. The fix adds proper permission validation to the onResult method in AccountManagerService.java, ensuring that callers are authorized before allowing authentication token modifications.

The specific code changes can be reviewed at commit c1aa9e662464b8fa49765d53a82efa8e06bb176a in the Android platform frameworks base repository.

Workarounds

• Limit application installations to trusted sources (Google Play Store) to reduce risk of malicious app exploitation
• Implement Mobile Device Management (MDM) policies to restrict which applications can be installed
• Use SentinelOne Singularity Mobile to detect and prevent exploitation attempts on Android devices
• Regularly review and audit applications with account management permissions

For enterprise deployments, ensure device management policies are configured to:

# Example MDM policy considerations
# Enforce minimum Android Security Patch Level
android_security_patch_level_minimum="2025-03-01"

# Restrict app installation sources
allow_unknown_sources="false"

# Enable Play Protect scanning
play_protect_enabled="true"