CVE-2021-2419
📋 TL;DR
This vulnerability in Oracle Outside In Technology allows unauthenticated attackers to cause denial of service by crashing or hanging the software. It affects systems using Oracle Fusion Middleware with Outside In Filters version 8.5.5. The risk is highest when the software processes untrusted network data.
💻 Affected Systems
- Oracle Fusion Middleware with Outside In Filters
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service for any application using Outside In Technology, potentially affecting multiple business processes that rely on document processing capabilities.
Likely Case
Service disruption for specific applications using Outside In Technology to process files, leading to temporary unavailability of document conversion or viewing features.
If Mitigated
Limited impact if proper network segmentation and input validation are implemented, restricting exposure to trusted sources only.
🎯 Exploit Status
Oracle describes it as 'easily exploitable' with no authentication required via HTTP.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Critical Patch Update for July 2021 or later
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2021.html
Restart Required: Yes
Instructions:
1. Download the appropriate Critical Patch Update from Oracle Support. 2. Apply the patch following Oracle's documentation. 3. Restart affected services. 4. Verify the patch was successfully applied.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to systems using Outside In Technology to only trusted sources
Input Validation
allImplement strict input validation before passing data to Outside In Technology
🧯 If You Can't Patch
- Implement strict network controls to limit access to affected systems
- Monitor for abnormal crashes or hangs in applications using Outside In Technology
🔍 How to Verify
Check if Vulnerable:
Check if Oracle Fusion Middleware with Outside In Filters version 8.5.5 is installed and if applications pass network data directly to it.Check Version:
Consult Oracle documentation for specific version checking commands based on your deployment.Verify Fix Applied:
Verify that the July 2021 Critical Patch Update or later has been applied and check version information.📡 Detection & Monitoring
Log Indicators:
- Unexpected crashes or hangs in applications using Outside In Technology
- Multiple failed document processing attempts
Network Indicators:
- Unusual HTTP traffic patterns to document processing endpoints
- Repeated connection attempts followed by service disruption
SIEM Query:
Search for application crashes containing 'OutsideIn' or 'Oracle Fusion Middleware' in error logs