CVE-2018-11816
📋 TL;DR
CVE-2018-11816 is a use-after-free vulnerability in Android's MediaServer component that allows attackers to execute arbitrary code with elevated privileges. Attackers can exploit this by sending a specially crafted Binder request, potentially gaining control of the device. This affects Android devices with Qualcomm components.
💻 Affected Systems
- Android devices with Qualcomm chipsets
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with kernel-level privileges, allowing persistent malware installation, data theft, and device control.
Likely Case
Local privilege escalation leading to app sandbox escape and unauthorized access to sensitive data or device functions.
If Mitigated
Limited impact if SELinux policies restrict MediaServer access and proper app sandboxing is enforced.
🎯 Exploit Status
Requires local access or malicious app. Heap manipulation adds complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Qualcomm May 2018 security bulletin patches
Vendor Advisory: https://docs.qualcomm.com/product/publicresources/securitybulletin/may-2018-bulletin.html
Restart Required: Yes
Instructions:
1. Check device manufacturer for security updates. 2. Apply May 2018 or later Qualcomm security patches. 3. Update Android OS to latest available version. 4. Reboot device after update.
🔧 Temporary Workarounds
Restrict MediaServer permissions
androidUse SELinux policies to limit MediaServer component access
Requires custom SELinux policy configuration
🧯 If You Can't Patch
- Disable unnecessary MediaServer services if possible
- Implement strict app vetting and installation controls
🔍 How to Verify
Check if Vulnerable:
Check Qualcomm chipset version and Android security patch level. Devices with pre-May 2018 Qualcomm patches are likely vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level is May 2018 or later and Qualcomm patches are applied.📡 Detection & Monitoring
Log Indicators:
- MediaServer crashes
- Binder transaction anomalies
- Privilege escalation attempts
Network Indicators:
- None - local exploitation only
SIEM Query:
Search for MediaServer process crashes or unusual Binder IPC activity