CVE-2020-5560
📋 TL;DR
CVE-2020-5560 is a critical remote code execution vulnerability in WL-Enq software that allows attackers to execute arbitrary operating system commands with administrative privileges. This affects WL-Enq versions 1.11 and 1.12, potentially compromising entire systems running this software.
💻 Affected Systems
- WL-Enq
📦 What is this software?
Wl Enq by Wl Enq Project
Wl Enq by Wl Enq Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, allowing attackers to install malware, steal data, pivot to other systems, or deploy ransomware.
Likely Case
Remote attackers gain administrative shell access to vulnerable systems, enabling data theft, service disruption, and lateral movement within networks.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated segments, though compromised systems still require full remediation.
🎯 Exploit Status
While no public PoC exists, the CVSS 9.8 score and remote unauthenticated nature make weaponization highly probable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.13 or later
Vendor Advisory: https://jvn.jp/en/jp/JVN27951364/index.html
Restart Required: Yes
Instructions:
1. Backup current WL-Enq configuration and data. 2. Download and install WL-Enq version 1.13 or later from official vendor sources. 3. Restart the WL-Enq service. 4. Verify functionality and restore configuration if needed.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to WL-Enq instances using firewall rules to only allow trusted IP addresses.
iptables -A INPUT -p tcp --dport [WL-Enq-port] -s [trusted-ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [WL-Enq-port] -j DROP
Application Firewall Rules
allImplement web application firewall rules to block OS command injection patterns.
🧯 If You Can't Patch
- Isolate vulnerable systems in separate network segments with strict firewall rules
- Implement network-based intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check WL-Enq version via web interface or configuration files. Versions 1.11 or 1.12 are vulnerable.Check Version:
Check web interface or configuration files for version informationVerify Fix Applied:
Verify WL-Enq version is 1.13 or later and test functionality remains intact.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Multiple failed authentication attempts followed by successful access
- Suspicious process creation from WL-Enq service
Network Indicators:
- Unusual outbound connections from WL-Enq server
- Command and control traffic patterns
- Unexpected port scanning from WL-Enq host
SIEM Query:
source="WL-Enq-logs" AND (process_execution OR command_injection OR suspicious_commands)