CVE-2019-6167
📋 TL;DR
This vulnerability in Lenovo Service Bridge allows remote attackers to execute arbitrary code on affected systems. It affects all users running Lenovo Service Bridge versions before 4.1.0.1. The high CVSS score indicates this is a critical security issue requiring immediate attention.
💻 Affected Systems
- Lenovo Service Bridge
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the affected machine, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Remote code execution allowing installation of malware, backdoors, or credential harvesting tools on vulnerable systems.
If Mitigated
Limited impact if proper network segmentation and endpoint protection are in place, though the vulnerability still presents significant risk.
🎯 Exploit Status
The vulnerability allows remote code execution, suggesting relatively straightforward exploitation once details are known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.1.0.1
Vendor Advisory: https://support.lenovo.com/solutions/LEN-27725
Restart Required: Yes
Instructions:
1. Download Lenovo Service Bridge version 4.1.0.1 or later from Lenovo's official website. 2. Uninstall the current version. 3. Install the updated version. 4. Restart the system.
🔧 Temporary Workarounds
Uninstall Lenovo Service Bridge
windowsRemove the vulnerable software entirely if not required for system functionality.
Control Panel > Programs > Uninstall a program > Select Lenovo Service Bridge > Uninstall
Network Blocking
windowsBlock network access to Lenovo Service Bridge using firewall rules.
New-NetFirewallRule -DisplayName "Block Lenovo Service Bridge" -Direction Outbound -Program "C:\Program Files\Lenovo\Service Bridge\LSB.exe" -Action Block
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems
- Deploy endpoint detection and response (EDR) solutions to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check the installed version of Lenovo Service Bridge via Control Panel > Programs and Features or by checking the program's about dialog.Check Version:
wmic product where name="Lenovo Service Bridge" get versionVerify Fix Applied:
Verify that Lenovo Service Bridge version is 4.1.0.1 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from LSB.exe
- Network connections from Lenovo Service Bridge to unexpected destinations
- Failed update attempts or unusual service behavior
Network Indicators:
- Outbound connections from LSB.exe to non-Lenovo domains or IPs
- Unusual traffic patterns from systems running vulnerable versions
SIEM Query:
source="*" (process_name="LSB.exe" AND (destination_ip NOT IN ["lenovo.com", "*.lenovo.com"] OR process_command_line CONTAINS suspicious_pattern))