CVE-2017-3761
📋 TL;DR
CVE-2017-3761 is a command injection vulnerability in Lenovo Service Framework Android app that allows attackers to execute arbitrary system commands. This can lead to remote code execution on affected Android devices. Users of Lenovo Android devices with the vulnerable app are affected.
💻 Affected Systems
- Lenovo Service Framework Android application
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install malware, steal data, or use device as part of botnet
Likely Case
Local privilege escalation or limited remote code execution depending on attack vector
If Mitigated
No impact if patched or app removed
🎯 Exploit Status
Exploitation requires local app access or specific remote attack vectors
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.1.3.1 and later
Vendor Advisory: https://support.lenovo.com/us/en/product_security/LEN-15374
Restart Required: No
Instructions:
1. Open Google Play Store on affected device
2. Search for 'Lenovo Service Framework'
3. Update to version 4.1.3.1 or later
4. Alternatively, disable or remove the app if not needed
🔧 Temporary Workarounds
Disable Lenovo Service Framework
androidDisable the vulnerable application to prevent exploitation
adb shell pm disable com.lenovo.lsf
Remove application
androidUninstall the Lenovo Service Framework app completely
adb shell pm uninstall -k --user 0 com.lenovo.lsf
🧯 If You Can't Patch
- Isolate affected devices from untrusted networks
- Implement application whitelisting to prevent malicious apps from exploiting the vulnerability
🔍 How to Verify
Check if Vulnerable:
Check app version: Settings > Apps > Lenovo Service Framework > App infoCheck Version:
adb shell dumpsys package com.lenovo.lsf | grep versionNameVerify Fix Applied:
Verify app version is 4.1.3.1 or higher in app settings📡 Detection & Monitoring
Log Indicators:
- Unusual system command execution from Lenovo Service Framework
- Privilege escalation attempts
Network Indicators:
- Unexpected outbound connections from Lenovo Service Framework
SIEM Query:
process_name:"Lenovo Service Framework" AND (command_execution OR privilege_escalation)