CVE-2020-7865
📋 TL;DR
CVE-2020-7865 is an improper input validation vulnerability in ExECM CoreB2B solution that allows unauthenticated attackers to download and execute arbitrary files via the httpDownload function. This could lead to complete system compromise. Organizations using ExECM CoreB2B are affected.
💻 Affected Systems
- ExECM CoreB2B
📦 What is this software?
Execm Coreb2b by Inoguard
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover, data exfiltration, ransomware deployment, and lateral movement across the network.
Likely Case
Initial foothold leading to privilege escalation, data theft, and installation of persistent backdoors.
If Mitigated
Limited impact due to network segmentation, proper access controls, and monitoring preventing successful exploitation.
🎯 Exploit Status
Unauthenticated remote code execution with CVSS 8.8 suggests relatively straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36229
Restart Required: Yes
Instructions:
1. Contact ExECM vendor for patch. 2. Apply patch to all affected systems. 3. Restart services/systems as required. 4. Verify patch application.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to ExECM CoreB2B systems to only trusted IP addresses/networks
Use firewall rules to limit inbound connections to specific source IPs
Application Layer Filtering
allImplement WAF rules to block suspicious httpDownload requests
Configure WAF to block requests containing path traversal patterns or unusual file extensions
🧯 If You Can't Patch
- Isolate affected systems in separate network segments with strict access controls
- Implement application allowlisting to prevent execution of unauthorized files
🔍 How to Verify
Check if Vulnerable:
Check if ExECM CoreB2B is installed and running. Review vendor advisory for specific version checks.Check Version:
Check application version through administrative interface or vendor documentationVerify Fix Applied:
Verify patch version from vendor and confirm no unauthorized file downloads occur.📡 Detection & Monitoring
Log Indicators:
- Unusual file download requests via httpDownload function
- Execution of unexpected files from temporary directories
Network Indicators:
- HTTP requests to download endpoints with suspicious file paths
- Outbound connections from ExECM systems to unknown external IPs
SIEM Query:
source="ExECM" AND (httpDownload OR file_download) AND (path_traversal OR ../ OR %2e%2e/)