CVE-2021-0649
📋 TL;DR
This vulnerability allows local attackers to bypass permissions and reset VPN profiles on Android devices, potentially gaining control over always-on VPN settings without user interaction. It affects Android 11 devices where an attacker has physical or local access.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker could disable or reconfigure always-on VPN protection, intercepting all network traffic and potentially accessing sensitive data transmitted through the VPN.
Likely Case
Local malware or malicious apps could disable VPN protection, exposing user traffic to monitoring or interception on compromised devices.
If Mitigated
With proper Android security updates applied, the vulnerability is eliminated and VPN protection functions as intended.
🎯 Exploit Status
Exploitation requires local access to the device but no additional execution privileges or user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level November 2021 or later
Vendor Advisory: https://source.android.com/security/bulletin/2021-11-01
Restart Required: Yes
Instructions:
1. Go to Settings > System > System update. 2. Check for and install available updates. 3. Ensure device shows 'Android security patch level: November 2021' or later in Settings > About phone.
🔧 Temporary Workarounds
Disable Developer Options
androidLimits potential attack vectors by disabling developer access features
Settings > System > Developer options > Toggle off
Restrict USB Debugging
androidPrevents unauthorized ADB access that could be used in exploitation
Settings > System > Developer options > USB debugging > Toggle off
🧯 If You Can't Patch
- Implement mobile device management (MDM) with strict app installation policies
- Use network-level VPN enforcement through enterprise firewalls or gateways
🔍 How to Verify
Check if Vulnerable:
Check Settings > About phone > Android security patch level. If earlier than November 2021, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows 'November 2021' or later date in Settings > About phone.📡 Detection & Monitoring
Log Indicators:
- Unexpected VPN profile changes in system logs
- stopVpnProfile calls from unauthorized processes
Network Indicators:
- Sudden VPN disconnections without user action
- Traffic bypassing VPN tunnel unexpectedly
SIEM Query:
source="android_system" AND (event="vpn_profile_reset" OR process="stopVpnProfile") AND user!=authorized_user