CVE-2020-7361
📋 TL;DR
This CVE describes an OS command injection vulnerability in EasyCorp ZenTao Pro that allows authenticated attackers to execute arbitrary commands with SYSTEM privileges on Windows systems. The vulnerability affects organizations using ZenTao Pro for project management. Attackers can gain complete control over affected systems through this flaw.
💻 Affected Systems
- EasyCorp ZenTao Pro
📦 What is this software?
Zentao Pro by Easycorp
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM privileges, enabling data theft, ransomware deployment, lateral movement, and persistent backdoor installation across the network.
Likely Case
Initial foothold leading to privilege escalation, data exfiltration, and potential ransomware deployment on vulnerable systems.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and proper monitoring detecting exploitation attempts.
🎯 Exploit Status
Metasploit module available (referenced in CVE), making exploitation trivial for attackers with valid credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check ZenTao Pro vendor updates for specific version
Vendor Advisory: Not specified in provided references
Restart Required: Yes
Instructions:
1. Check EasyCorp website for security updates. 2. Apply latest ZenTao Pro patch. 3. Restart ZenTao service. 4. Verify fix by testing exploitation.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation on the 'path' parameter to reject shell metacharacters
Implement server-side validation: if re.search(r'[;&|`$()]', path_param): return error
Network Segmentation
allIsolate ZenTao Pro servers from critical systems and internet
Configure firewall rules to restrict ZenTao server network access
🧯 If You Can't Patch
- Implement strict network segmentation to isolate ZenTao servers
- Enforce strong authentication and limit user access to only necessary personnel
🔍 How to Verify
Check if Vulnerable:
Test by attempting command injection via authenticated POST request to '/pro/repo-create.html' with malicious 'path' parameterCheck Version:
Check ZenTao Pro version in admin dashboard or configuration filesVerify Fix Applied:
Attempt same exploitation after patch - should receive error or sanitized output instead of command execution📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in Windows event logs
- ZenTao logs showing shell metacharacters in 'path' parameter
- Multiple failed authentication attempts followed by repo-create access
Network Indicators:
- POST requests to '/pro/repo-create.html' containing shell metacharacters in parameters
- Outbound connections from ZenTao server to unusual destinations
SIEM Query:
source="zentaopro" AND uri_path="/pro/repo-create.html" AND (param="path" AND value MATCHES "[;&|`$()]")