CVE-2017-18688
📋 TL;DR
This vulnerability allows attackers to read sensitive memory locations outside intended buffers on Samsung mobile devices. It affects Samsung devices running Android 5.1 (Lollipop), 6.0 (Marshmallow), and 7.0 (Nougat) software. The information disclosure occurs through the /dev/dsm_ctrl_dev device interface.
💻 Affected Systems
- Samsung mobile devices
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive kernel memory, potentially obtaining authentication tokens, encryption keys, or other privileged information leading to full device compromise.
Likely Case
Local attackers or malicious apps could read adjacent memory to gather information about system state or other processes, potentially enabling further exploitation.
If Mitigated
With proper app sandboxing and SELinux policies, impact is limited to information disclosure within the kernel context rather than full system compromise.
🎯 Exploit Status
Exploitation requires local access to the device filesystem or ability to execute code on the device. No public exploit code has been documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates from January 2017 onward
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb
Restart Required: Yes
Instructions:
1. Check for security updates in device Settings > About phone > Software update. 2. Install any available updates. 3. Restart device after update completes.
🔧 Temporary Workarounds
Restrict device access
allLimit physical access to devices and only install apps from trusted sources
Update Android security patch level
androidEnsure device has at least January 2017 security patches installed
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict app installation policies and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check if device is running Android 5.1, 6.0, or 7.0 and has security patch level older than January 2017 in Settings > About phone > Android security patch levelCheck Version:
adb shell getprop ro.build.version.release && adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level is January 2017 or newer and check that /dev/dsm_ctrl_dev device permissions are properly restricted📡 Detection & Monitoring
Log Indicators:
- Unusual access to /dev/dsm_ctrl_dev device
- Kernel memory access violations
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Look for process access to /dev/dsm_ctrl_dev or kernel memory violation alerts