CVE-2018-18698
📋 TL;DR
This vulnerability exposes Wi-Fi hotspot passwords in cleartext within system logs on Xiaomi Mi A1 devices. Attackers with physical access or malware can extract these passwords, potentially compromising network security. Only Xiaomi Mi A1 devices with specific firmware versions are affected.
💻 Affected Systems
- Xiaomi Mi A1 (tissot_sprout)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized access to the Wi-Fi network, enabling man-in-the-middle attacks, data interception, and lateral movement to connected devices.
Likely Case
Local attackers or malware with log access can extract Wi-Fi passwords, compromising network security and potentially exposing sensitive traffic.
If Mitigated
With proper logging controls and access restrictions, the risk is limited to authorized users who already have device access.
🎯 Exploit Status
Exploitation requires access to logcat output via ADB, physical access, or malware. Simple grep commands can extract passwords.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later firmware versions from Xiaomi
Vendor Advisory: Not publicly documented by Xiaomi
Restart Required: Yes
Instructions:
1. Update Xiaomi Mi A1 to latest firmware via Settings > System > System update. 2. Verify update installed. 3. Restart device.
🔧 Temporary Workarounds
Disable logging of sensitive data
androidConfigure logcat to exclude sensitive information or disable debug logging in production
adb shell logcat -P ""
adb shell setprop log.tag.System WARN
Restrict log access
androidLimit access to logcat through Android permissions and disable USB debugging
adb shell pm revoke com.android.shell android.permission.READ_LOGS
Disable USB debugging in Developer options
🧯 If You Can't Patch
- Avoid using Wi-Fi hotspot feature on affected devices
- Implement network segmentation and monitor for unusual Wi-Fi connections
🔍 How to Verify
Check if Vulnerable:
1. Enable Wi-Fi hotspot on device. 2. Run: adb logcat | grep -i password. 3. Check if Wi-Fi password appears in cleartext.Check Version:
adb shell getprop ro.build.version.incrementalVerify Fix Applied:
1. Update firmware. 2. Repeat vulnerable check. 3. Confirm password no longer appears in logs.📡 Detection & Monitoring
Log Indicators:
- Cleartext Wi-Fi passwords in logcat output
- Sensitive data in Android system logs
Network Indicators:
- Unauthorized devices connecting to Wi-Fi networks
- Unusual authentication attempts
SIEM Query:
source="android_logcat" AND "password" AND "wifi"