CVE-2025-48543
📋 TL;DR
This CVE describes a use-after-free vulnerability in Android's Chrome sandbox that allows local attackers to escape the sandbox and attack the system_server process. This leads to local privilege escalation without requiring user interaction or additional execution privileges. Affected systems include Android devices running vulnerable versions.
💻 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
Complete compromise of the Android system_server, allowing an attacker to gain root privileges, install persistent malware, access all user data, and potentially brick the device.
Likely Case
Local attacker gains elevated privileges to install malicious apps, access sensitive system resources, or perform unauthorized actions on the device.
If Mitigated
Limited impact if devices are fully patched and have additional security controls like SELinux enforcement and app sandboxing properly configured.
🎯 Exploit Status
CISA has added this to their Known Exploited Vulnerabilities catalog, confirming active exploitation. Exploitation requires local access to the device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level September 2025 or later
Vendor Advisory: https://source.android.com/security/bulletin/2025-09-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install the September 2025 Android security patch. 3. Restart the device after installation completes.
🔧 Temporary Workarounds
Disable Chrome/WebView updates
androidPrevents potential exploitation through web content by disabling automatic updates to Chrome/WebView components
adb shell pm disable-user --user 0 com.android.chrome
adb shell pm disable-user --user 0 com.google.android.webview
🧯 If You Can't Patch
- Restrict physical access to devices and implement strict app installation policies
- Enable Google Play Protect and only install apps from trusted sources
🔍 How to Verify
Check if Vulnerable:
Check Settings > About phone > Android version > Security patch level. If date is before September 2025, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Security patch level shows 'September 5, 2025' or later in Settings > About phone.📡 Detection & Monitoring
Log Indicators:
- Unusual system_server crashes or restarts
- SELinux denials related to Chrome sandbox escape attempts
- Unexpected privilege escalation events in system logs
Network Indicators:
- Unusual network connections from system_server to external domains
SIEM Query:
source="android_system_logs" AND (process="system_server" AND event="crash") OR (process="chrome" AND event="sandbox_violation")