CVE-2021-0584
📋 TL;DR
This vulnerability in Android's Parcel component allows local attackers to read memory beyond intended boundaries without requiring user interaction or elevated privileges. It affects Android versions 8.1 through 11, potentially exposing sensitive information from other apps or system processes.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Local information disclosure could expose sensitive data from other applications or system components, potentially enabling further attacks.
Likely Case
Limited information disclosure from adjacent memory locations, possibly revealing non-critical system information.
If Mitigated
No impact if patched or if affected component is not used by vulnerable applications.
🎯 Exploit Status
Exploitation requires a malicious app to be installed on the device. No user interaction needed once app is installed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin August 2021 patches
Vendor Advisory: https://source.android.com/security/bulletin/2021-08-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > Advanced > System update. 2. Install the August 2021 security patch or later. 3. Reboot device after installation.
🔧 Temporary Workarounds
No effective workarounds
allThis is a core framework vulnerability requiring patching at the OS level.
🧯 If You Can't Patch
- Restrict installation of untrusted applications from unknown sources
- Use Android Enterprise or similar management to control app installation
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Android version. If version is 8.1, 9, 10, or 11 without August 2021 security patches, device is vulnerable.Check Version:
adb shell getprop ro.build.version.release && adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Check security patch level in Settings > About phone > Android security patch level. Should show 'August 5, 2021' or later.📡 Detection & Monitoring
Log Indicators:
- Unusual memory access patterns in system logs
- Crash reports from Parcel-related components
Network Indicators:
- No network indicators - local vulnerability only
SIEM Query:
No specific SIEM query - monitor for Android security patch compliance