CVE-2020-5626
📋 TL;DR
CVE-2020-5626 allows remote attackers to execute arbitrary operating system commands by uploading a specially crafted log file to Logstorage or ELC Analytics. This affects Logstorage version 8.0.0 and earlier, and ELC Analytics version 3.0.0 and earlier. Attackers can gain full control of affected systems.
💻 Affected Systems
- Logstorage
- ELC Analytics
📦 What is this software?
Elc Analytics by Infoscience
Logstorage by Infoscience
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining root/administrator privileges, data exfiltration, ransomware deployment, and lateral movement across the network.
Likely Case
Remote code execution leading to data theft, installation of backdoors, or use as a pivot point for further attacks.
If Mitigated
Limited impact with proper network segmentation, file upload restrictions, and command execution controls in place.
🎯 Exploit Status
Exploitation requires uploading a malicious log file, which is a straightforward attack vector.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Logstorage 8.0.1+, ELC Analytics 3.0.1+
Vendor Advisory: https://www.logstorage.com/support/vulnerability_info.html#jvn-41853173
Restart Required: Yes
Instructions:
1. Download and install the patched version from the vendor's official website. 2. Stop the service. 3. Apply the update. 4. Restart the service. 5. Verify the version is updated.
🔧 Temporary Workarounds
Disable log file upload functionality
allTemporarily disable the ability to upload log files until patching is complete.
# Check configuration files for upload settings and disable
Implement file upload restrictions
allConfigure web application firewalls or reverse proxies to block malicious log file uploads.
# Example: Configure WAF rules to inspect log file uploads
🧯 If You Can't Patch
- Isolate affected systems in a segmented network zone with strict inbound/outbound controls.
- Implement strict file upload validation and sanitization for log files.
🔍 How to Verify
Check if Vulnerable:
Check the installed version of Logstorage or ELC Analytics against affected versions.Check Version:
# For Logstorage: check version in admin interface or configuration files
# For ELC Analytics: check version in web interface or documentationVerify Fix Applied:
Verify the version is updated to Logstorage 8.0.1+ or ELC Analytics 3.0.1+.📡 Detection & Monitoring
Log Indicators:
- Unusual log file uploads, unexpected command execution in system logs, abnormal process creation
Network Indicators:
- Suspicious outbound connections from log storage systems, unexpected file transfers
SIEM Query:
source="logstorage" AND (event="file_upload" OR event="command_execution")