CVE-2021-2066
📋 TL;DR
This vulnerability in Oracle Outside In Technology allows unauthenticated attackers with network access via HTTP to compromise systems using this SDK. Attackers can create, delete, or modify critical data, read sensitive information, and cause partial denial of service. Affected are Oracle Fusion Middleware versions 8.5.4 and 8.5.5 that use Outside In Filters.
💻 Affected Systems
- Oracle Fusion Middleware with Outside In Technology component
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of systems using Outside In Technology, allowing data destruction, exfiltration, and service disruption across affected applications.
Likely Case
Unauthorized data manipulation and partial service disruption in applications that process untrusted files through Outside In Technology.
If Mitigated
Limited impact if network access is restricted and input validation prevents malicious data from reaching vulnerable components.
🎯 Exploit Status
Oracle describes as 'easily exploitable' with network access via HTTP. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle Critical Patch Update Advisory - January 2021
Vendor Advisory: https://www.oracle.com/security-alerts/cpujan2021.html
Restart Required: Yes
Instructions:
1. Review Oracle Critical Patch Update Advisory for January 2021. 2. Download and apply relevant patches for Oracle Fusion Middleware. 3. Restart affected services. 4. Verify patch application.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to systems using Outside In Technology to trusted sources only
Input Validation
allImplement strict input validation and sanitization before passing data to Outside In Technology components
🧯 If You Can't Patch
- Isolate affected systems from untrusted networks and internet access
- Implement application-level input validation and file type restrictions
🔍 How to Verify
Check if Vulnerable:
Check Oracle Fusion Middleware version and Outside In Technology component version. If using 8.5.4 or 8.5.5, system is vulnerable.Check Version:
Oracle-specific version checking commands vary by installation. Consult Oracle documentation for your specific deployment.Verify Fix Applied:
Verify patch application through Oracle patch management tools and confirm version is no longer 8.5.4 or 8.5.5.📡 Detection & Monitoring
Log Indicators:
- Unusual file processing errors
- Unexpected process crashes in Oracle services
- Suspicious HTTP requests to affected endpoints
Network Indicators:
- Unexpected HTTP traffic to Oracle Fusion Middleware services
- Anomalous file upload patterns
SIEM Query:
Search for: (Oracle OR Fusion OR Middleware) AND (error OR crash OR exception) AND (OutsideIn OR file processing)