CVE-2023-21233
📋 TL;DR
This vulnerability in Android's AVRCP (Audio/Video Remote Control Profile) implementation allows uninitialized heap memory to be leaked to remote Bluetooth devices. It affects Android Wear OS devices and could expose sensitive data without user interaction. Attackers within Bluetooth range could potentially access information from device memory.
💻 Affected Systems
- Android Wear OS
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker extracts sensitive data like authentication tokens, encryption keys, or personal information from device memory, leading to account compromise or further attacks.
Likely Case
Information disclosure of random memory contents, potentially including device identifiers, application data fragments, or other system information.
If Mitigated
With proper Bluetooth security controls and network segmentation, impact is limited to information disclosure within Bluetooth range only.
🎯 Exploit Status
Exploitation requires Bluetooth proximity and knowledge of the vulnerability, but no authentication or user interaction is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: August 2023 security patch for Android Wear OS
Vendor Advisory: https://source.android.com/security/bulletin/wear/2023-08-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System updates. 2. Install August 2023 security patch. 3. Reboot device after installation completes.
🔧 Temporary Workarounds
Disable Bluetooth
allTemporarily disable Bluetooth to prevent exploitation until patch can be applied
Settings > Connections > Bluetooth > Toggle off
Limit Bluetooth Visibility
allSet device to non-discoverable mode to reduce attack surface
Settings > Connections > Bluetooth > Device name > Visibility > Non-discoverable
🧯 If You Can't Patch
- Segment Bluetooth devices to isolated networks away from sensitive systems
- Implement physical security controls to limit Bluetooth range access to trusted areas only
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level in Settings > About phone > Android versionCheck Version:
Settings > About phone > Android versionVerify Fix Applied:
Verify security patch level shows August 2023 or later in Settings > About phone > Android version📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth connection attempts
- AVRCP protocol anomalies in Bluetooth logs
Network Indicators:
- Suspicious Bluetooth traffic patterns
- AVRCP data transfers to unknown devices
SIEM Query:
bluetooth AND (avrcp OR "remote control") AND (error OR anomaly OR unexpected)