CVE-2022-23728: Google Android DOS Vulnerability

CVE-2022-23728 Overview

CVE-2022-23728 is a mobile device vulnerability affecting LG Android devices that allows an attacker with physical access to reset the device using AT Commands during the reboot process. This vulnerability exposes a critical window during device rebooting where AT Command interfaces become accessible, enabling unauthorized device manipulation. The LG security identifier for this issue is LVE-SMP-210011.

Critical Impact

Physical attackers can exploit the reboot process to issue AT Commands that reset the device, potentially causing complete data loss and denial of service.

Affected Products

• Google Android (LG devices)
• LG Mobile Devices running affected Android versions
• Devices with exposed AT Command interfaces during boot

Discovery Timeline

• 2022-01-21 - CVE-2022-23728 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-23728

Vulnerability Analysis

This vulnerability stems from improper handling of AT Command interfaces during the device reboot process on LG Android devices. AT Commands (Hayes command set) are traditionally used for modem communication and device configuration. During the vulnerable window when the device is rebooting, the AT Command interface becomes accessible to physical attackers, allowing them to issue device reset commands.

The attack requires physical access to the device, meaning an attacker must have hands-on access to the target device during the reboot sequence. The vulnerability impacts both data integrity and system availability, as successful exploitation results in complete device reset and potential data destruction.

Root Cause

The root cause relates to CWE-684 (Incorrect Provision of Specified Functionality), where the AT Command interface is improperly exposed during the boot process. The device fails to adequately restrict access to sensitive AT Command functionality during the transitional reboot state, when security controls may not be fully initialized or enforced.

During normal device operation, AT Command interfaces should be restricted or disabled to prevent unauthorized access. However, the vulnerable implementation leaves this interface accessible during reboot, creating an exploitation window for attackers with physical access.

Attack Vector

The attack requires physical proximity to the target device. An attacker must:

1. Gain physical access to the LG Android device
2. Initiate or wait for a device reboot sequence
3. Connect to the device via USB or other physical interface during the reboot window
4. Issue AT Commands to trigger a device reset

The vulnerability does not require authentication or any prior privileges, making it exploitable by anyone with temporary physical access to an unattended device. The impact is primarily denial of service through data loss, as the attacker can force a factory reset, wiping all user data and configurations from the device.

The physical access requirement limits the attack surface compared to remote vulnerabilities, but the impact remains significant in scenarios involving device theft, shared devices, or environments where attackers may have brief unsupervised access to mobile devices.

Detection Methods for CVE-2022-23728

Indicators of Compromise

• Unexpected device resets or factory restore events without user initiation
• Evidence of USB connections during device reboot sequences
• Device logs showing AT Command activity during boot process
• User reports of data loss following device reboots

Detection Strategies

• Monitor for unexpected factory reset events on managed LG devices
• Implement device management solutions that track boot sequences and configuration changes
• Review USB connection logs for suspicious activity during device reboots
• Deploy endpoint detection that alerts on unauthorized AT Command interface access

Monitoring Recommendations

• Enable comprehensive logging on managed Android devices to capture boot-time events
• Implement mobile device management (MDM) solutions to monitor device state changes
• Configure alerts for unexpected device wipes or configuration resets in enterprise environments
• Maintain audit trails of physical device access in high-security environments

How to Mitigate CVE-2022-23728

Immediate Actions Required

• Apply security updates from LG to affected devices as referenced in the LG Security Mobile Bulletin
• Restrict physical access to vulnerable LG Android devices
• Implement device encryption to protect data at rest
• Enable strong device authentication to limit the impact of unauthorized resets

Patch Information

LG has addressed this vulnerability through security updates. Administrators and users should consult the LG Security Mobile Bulletin for specific patch information and update instructions for affected device models. The vulnerability is tracked by LG under the identifier LVE-SMP-210011.

Workarounds

• Maintain strict physical security controls for affected devices
• Never leave devices unattended in untrusted environments
• Enable device encryption to protect sensitive data even if a reset occurs
• Use mobile device management (MDM) solutions to track device status and detect unauthorized resets
• Consider device retirement or replacement if patches are not available for older models

# Android device management verification
# Check device security patch level
adb shell getprop ro.build.version.security_patch

# Verify device encryption status
adb shell getprop ro.crypto.state