CVE-2018-9383
📋 TL;DR
CVE-2018-9383 is an out-of-bounds read vulnerability in Android's ASN.1 BER decoder that could allow local information disclosure. Attackers need system execution privileges to exploit this vulnerability, but no user interaction is required. This affects Android devices running vulnerable kernel versions.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker with system privileges could read sensitive kernel memory, potentially exposing cryptographic keys, passwords, or other protected data.
Likely Case
Local information disclosure where an attacker with elevated privileges reads kernel memory to gather system information or bypass security controls.
If Mitigated
With proper privilege separation and SELinux policies, impact is limited to controlled information disclosure within the kernel context.
🎯 Exploit Status
Exploitation requires system execution privileges, making it less accessible to typical attackers but dangerous in privilege escalation scenarios.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level 2018-06-05 or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2018-06-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > Advanced > System update. 2. Install the June 2018 security patch or later. 3. Reboot the device after installation.
🔧 Temporary Workarounds
Restrict system privileges
androidLimit applications and users with system execution privileges to reduce attack surface.
🧯 If You Can't Patch
- Implement strict SELinux policies to limit what system-privileged processes can access
- Monitor for privilege escalation attempts and unusual system process behavior
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If before June 2018, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows 2018-06-05 or later date.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- ASN.1 decoder error messages in kernel logs
- Unusual system process memory access patterns
Network Indicators:
- Not applicable - local vulnerability only
SIEM Query:
Not applicable for network detection - focus on host-based kernel logs and privilege escalation monitoring