CVE-2025-48636: Google Android Path Traversal Vulnerability

CVE-2025-48636 Overview

CVE-2025-48636 is a path traversal vulnerability affecting Google Android's BugreportContentProvider.java. The flaw exists in the openFile function, which fails to properly sanitize file path inputs, allowing attackers to read and write unauthorized files on the device. This vulnerability enables local privilege escalation without requiring any additional execution privileges or user interaction.

Critical Impact

Local attackers can exploit this path traversal flaw to escalate privileges by reading sensitive system files or writing malicious content to protected directories, potentially compromising device integrity and confidentiality.

Affected Products

• Google Android 16.0

Discovery Timeline

• 2026-03-02 - CVE CVE-2025-48636 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2025-48636

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Path Traversal), a well-documented weakness where user-controlled input is used to construct file paths without adequate validation. In the context of BugreportContentProvider.java, the openFile method accepts a URI parameter that specifies which file to access. However, the implementation does not properly validate or sanitize the path components, enabling directory traversal sequences.

The attack requires local access to the Android device but does not need elevated privileges or any form of user interaction to execute. An attacker with local access can craft malicious requests to the content provider that escape the intended directory boundaries, gaining unauthorized access to sensitive system files or the ability to write to protected locations.

Root Cause

The root cause is improper input validation in the openFile method of BugreportContentProvider.java. The function fails to sanitize or canonicalize file paths before processing them, allowing path traversal sequences such as ../ to escape the intended directory structure. This permits access to files outside the designated bugreport directory, including sensitive system configuration files, application data, and protected resources.

Attack Vector

The attack is executed locally on the Android device. An attacker can invoke the vulnerable content provider with a crafted URI containing path traversal sequences. Since the openFile method does not properly validate the path, these sequences allow the attacker to navigate the file system hierarchy beyond the intended scope.

The exploitation process involves constructing a URI that targets BugreportContentProvider with malicious path components. For example, including ../ sequences in the file path parameter allows traversal to parent directories. The attacker can then read sensitive files such as /data/system/ contents or write malicious payloads to system directories, potentially achieving privilege escalation.

For detailed technical information, refer to the Android Wear Security Bulletin.

Detection Methods for CVE-2025-48636

Indicators of Compromise

• Unusual content provider access patterns targeting BugreportContentProvider with abnormal URI parameters
• File system access logs showing reads or writes to sensitive system directories from unexpected processes
• Evidence of path traversal sequences (../, ..%2f, or encoded variants) in application logs
• Unexpected modifications to system files or configuration data

Detection Strategies

• Monitor content provider invocations for suspicious URI patterns containing directory traversal sequences
• Implement file integrity monitoring on critical system directories to detect unauthorized modifications
• Analyze application sandbox violations and unexpected inter-process communication patterns
• Deploy endpoint detection rules that flag abnormal file access from the bugreport service context

Monitoring Recommendations

• Enable verbose logging for content provider access and audit file system operations
• Monitor for privilege escalation indicators following suspicious content provider activity
• Implement real-time alerting for attempts to access sensitive directories outside the bugreport scope
• Review audit logs regularly for signs of path traversal exploitation attempts

How to Mitigate CVE-2025-48636

Immediate Actions Required

• Apply the latest Android security updates from Google addressing CVE-2025-48636
• Review and restrict permissions for applications that interact with content providers
• Consider disabling or restricting access to BugreportContentProvider if not required for operational needs
• Implement additional file system access controls to limit potential impact

Patch Information

Google has released security updates addressing this vulnerability as documented in the Android Wear Security Bulletin for March 2026. Organizations should apply the March 2026 security patch level or later to remediate this vulnerability. Device manufacturers and carriers should prioritize pushing these updates to affected devices running Android 16.0.

Workarounds

• Restrict application permissions to minimize exposure to content provider exploitation
• Implement application sandboxing and access control policies to limit file system access
• Disable bugreport functionality on sensitive devices where feasible until patches are applied
• Use mobile device management (MDM) solutions to enforce security policies and restrict vulnerable components

For enterprise environments, consider implementing network-level controls and endpoint detection capabilities to identify exploitation attempts:

# Example: Monitor for suspicious content provider access in Android debug logs
adb logcat | grep -E "BugreportContentProvider|\.\.\/|path.*traversal"