CVE-2018-9431
📋 TL;DR
CVE-2018-9431 is a local privilege escalation vulnerability in Android's OSUInfo component due to improper input validation. It allows attackers to gain elevated privileges without user interaction or additional execution privileges. This affects Android devices running vulnerable versions, particularly Google Pixel devices.
💻 Affected Systems
- Android
- Google Pixel devices
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to execute arbitrary code with system privileges, access sensitive data, and persist malware.
Likely Case
Local attacker gains elevated privileges to access restricted system resources or install malicious applications.
If Mitigated
Minimal impact if patched; unpatched devices remain vulnerable to local attackers with physical or remote access.
🎯 Exploit Status
Requires local access but no user interaction; exploitation involves crafting malicious input to trigger privilege escalation
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level 2018-07-05 or later
Vendor Advisory: https://source.android.com/docs/security/bulletin/pixel/2018-07-01
Restart Required: No
Instructions:
1. Check current security patch level in Settings > About phone > Android security patch level. 2. If before 2018-07-05, update via Settings > System > System update. 3. Apply available security updates. 4. Verify patch level after update.
🔧 Temporary Workarounds
Restrict physical access
allLimit physical access to devices to prevent local exploitation
🧯 If You Can't Patch
- Isolate vulnerable devices from sensitive networks and data
- Implement strict access controls and monitoring for device usage
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If date is before 2018-07-05, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows 2018-07-05 or later after applying updates.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts in system logs
- Abnormal OSUInfo component activity
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
Not applicable for network detection; monitor device logs for privilege escalation patterns