CVE-2021-2449
📋 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 applications using Outside In Technology to process files, causing application crashes or hangs when processing malicious content.
If Mitigated
Limited impact if proper network segmentation and input validation are implemented to prevent untrusted data from reaching vulnerable components.
🎯 Exploit Status
Oracle describes it as 'easily exploitable' with unauthenticated network access via HTTP. No public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle Critical Patch Update July 2021
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2021.html
Restart Required: Yes
Instructions:
1. Review Oracle Critical Patch Update Advisory for July 2021. 2. Download and apply appropriate patches for your Oracle Fusion Middleware installation. 3. Restart affected services. 4. Test functionality after patching.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to systems using Outside In Technology to prevent unauthenticated HTTP access
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="TRUSTED_NETWORK" port protocol="tcp" port="PORT_NUMBER" accept'
netsh advfirewall firewall add rule name="Restrict Oracle" dir=in action=allow protocol=TCP localport=PORT remoteip=TRUSTED_IP
Input Validation
allImplement strict input validation before passing data to Outside In Technology components
🧯 If You Can't Patch
- Implement network controls to restrict access to vulnerable systems only from trusted sources
- Monitor for abnormal application behavior or crashes that could indicate exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Oracle Fusion Middleware version and Outside In Technology component version. If using version 8.5.5 of Outside In Filters, system is vulnerable.Check Version:
Check Oracle documentation for specific version commands. Typically: opatch lsinventory or review Oracle Home inventory.Verify Fix Applied:
Verify patch installation through Oracle patch management tools and confirm version is no longer 8.5.5. Test with known safe files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Application crashes or hangs in Oracle Fusion Middleware logs
- Abnormal termination of Outside In Technology processes
- Increased error rates in document processing operations
Network Indicators:
- Unusual HTTP traffic patterns to Oracle services
- Multiple connection attempts followed by service disruption
SIEM Query:
source="oracle_middleware" AND (event_type="crash" OR event_type="hang") OR (http_request AND dest_port="ORACLE_PORT" AND status_code="500")