CVE-2022-20481: Android WiFi Information Disclosure Flaw

CVE-2022-20481 Overview

CVE-2022-20481 is a local information disclosure vulnerability affecting multiple versions of Google Android. The vulnerability exists in multiple files within the Android operating system and allows an attacker to preserve WiFi settings due to residual data that persists after a factory reset. This could lead to local information disclosure without requiring additional execution privileges, though user interaction is needed for exploitation.

Critical Impact

WiFi configuration data including potentially sensitive network credentials and connection history may persist after a device factory reset, allowing subsequent users or attackers with physical access to recover this information.

Affected Products

• Google Android 10.0
• Google Android 11.0
• Google Android 12.0
• Google Android 12.1 (Android 12L)
• Google Android 13.0

Discovery Timeline

• 2023-02-28 - CVE-2022-20481 published to NVD
• 2025-03-21 - Last updated in NVD database

Technical Details for CVE-2022-20481

Vulnerability Analysis

This vulnerability is classified as an information disclosure issue stemming from improper data sanitization during the device factory reset process. When a user initiates a factory reset on an affected Android device, the system fails to properly clear WiFi configuration data from persistent storage. This residual data remains accessible to subsequent users or attackers who gain physical access to the device.

The vulnerability affects the core WiFi management subsystem across multiple Android versions spanning from Android 10 through Android 13. The issue has been tracked internally by Google under Android ID A-241927115.

Root Cause

The root cause of CVE-2022-20481 lies in incomplete data sanitization routines during the factory reset process. Specifically, certain WiFi configuration files and settings are not properly wiped from persistent storage when a factory reset is performed. This may include stored network SSIDs, passwords, connection preferences, and other WiFi-related configuration data that should be cleared during the reset process.

Attack Vector

The attack vector for this vulnerability is local, requiring physical access to the affected device. An attacker could exploit this vulnerability through the following general approach:

1. Obtain physical access to an Android device that has undergone a factory reset
2. Boot the device and access the recovered WiFi configuration data
3. Extract sensitive information such as previously connected network names and credentials

The vulnerability requires user interaction for exploitation, as the victim must have performed a factory reset prior to the attacker gaining access. No special privileges are required by the attacker beyond physical device access.

The technical mechanism involves residual WiFi configuration data stored in system partitions or protected storage areas that are not properly cleared during the standard factory reset procedure. This data persists across the reset operation and becomes accessible when the device is reconfigured.

Detection Methods for CVE-2022-20481

Indicators of Compromise

• Unexpected WiFi network configurations present on newly reset or recently acquired Android devices
• Presence of previously unknown saved network entries in WiFi settings after factory reset
• WiFi auto-connection to networks that were not manually configured by the current user

Detection Strategies

• Implement mobile device management (MDM) solutions to audit WiFi configuration states after device provisioning
• Use endpoint detection tools to monitor for anomalous WiFi configuration data on enterprise-managed Android devices
• Conduct forensic analysis of device storage to identify residual data patterns after factory reset operations

Monitoring Recommendations

• Monitor enterprise Android device fleet for inconsistent WiFi configurations following device resets
• Implement automated compliance checks for device state following factory reset procedures
• Review device audit logs for unexpected network connection attempts

How to Mitigate CVE-2022-20481

Immediate Actions Required

• Update affected Android devices to the February 2023 security patch level or later
• For devices pending update, consider manual WiFi configuration deletion before factory reset
• Implement enterprise MDM policies requiring security patch compliance
• Review organizational device disposal and transfer procedures to account for residual data risks

Patch Information

Google has addressed this vulnerability in the Android Security Bulletin - February 2023. Organizations and users should update their Android devices to the February 2023 security patch level or later to receive the fix. The patch ensures proper sanitization of WiFi configuration data during the factory reset process.

Workarounds

• Manually delete all saved WiFi networks from device settings before performing a factory reset
• For high-security environments, consider cryptographic wipe tools that perform multiple overwrite passes
• Implement device encryption to protect residual data from unauthorized access
• For enterprise environments, use MDM solutions that enforce secure wipe procedures before device decommissioning

For enterprise deployments, organizations should ensure that device decommissioning procedures include verification of proper data sanitization. Consult the official Android Security Bulletin for the most current remediation guidance.