CVE-2020-4493
📋 TL;DR
CVE-2020-4493 is an authentication bypass vulnerability in IBM Maximo Asset Management that allows unauthenticated attackers to execute arbitrary commands via specially crafted HTTP requests. This affects IBM Maximo Asset Management versions 7.6.0 and 7.6.1. Organizations using these versions without proper patching are vulnerable to complete system compromise.
💻 Affected Systems
- IBM Maximo Asset Management
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, data theft, ransomware deployment, and lateral movement across the network.
Likely Case
Unauthenticated remote code execution leading to data exfiltration, credential harvesting, and installation of backdoors.
If Mitigated
Limited impact with proper network segmentation, web application firewalls, and intrusion detection systems in place.
🎯 Exploit Status
CVSS 9.8 indicates trivial exploitation requiring no authentication or user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Interim Fix 7.6.1.2 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/6340281
Restart Required: Yes
Instructions:
1. Download Interim Fix 7.6.1.2 from IBM Fix Central. 2. Stop Maximo application server. 3. Apply the fix according to IBM documentation. 4. Restart Maximo application server. 5. Verify patch installation.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Maximo servers to only trusted networks and users.
Web Application Firewall
allDeploy WAF with rules to block suspicious HTTP requests targeting Maximo endpoints.
🧯 If You Can't Patch
- Isolate affected systems in a separate network segment with strict access controls
- Implement application-level monitoring and alerting for suspicious HTTP requests
🔍 How to Verify
Check if Vulnerable:
Check Maximo version via administrative console or by examining installation files. If version is 7.6.0 or 7.6.1 without Interim Fix 7.6.1.2, system is vulnerable.Check Version:
Check Maximo version in the application's About section or via administrative console.Verify Fix Applied:
Verify that Interim Fix 7.6.1.2 or later is installed through Maximo's administrative interface or patch management system.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to Maximo endpoints
- Authentication bypass attempts
- Unexpected command execution logs
Network Indicators:
- HTTP requests with crafted parameters to Maximo servers
- Unusual outbound connections from Maximo servers
SIEM Query:
source="maximo" AND (http_method="POST" OR http_method="GET") AND (url_contains="/maximo" OR url_contains="/meaweb") AND status="200" AND user="anonymous"