CVE-2021-35658
📋 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 any system using Oracle Fusion Middleware with Outside In Filters version 8.5.5. The vulnerability is network-accessible via HTTP and requires no user interaction.
💻 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 for document conversion or processing, leading to application crashes and downtime.
If Mitigated
Limited impact if network access is restricted or if input validation prevents malicious payloads from reaching the vulnerable component.
🎯 Exploit Status
Oracle describes this as 'easily exploitable' with no authentication required. The attack vector is HTTP network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle Critical Patch Update October 2021
Vendor Advisory: https://www.oracle.com/security-alerts/cpuoct2021.html
Restart Required: Yes
Instructions:
1. Review Oracle Critical Patch Update Advisory for October 2021. 2. Download and apply the appropriate patches for your Oracle Fusion Middleware installation. 3. Restart affected services. 4. Test document processing functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to applications using Outside In Technology to trusted sources only
Input Validation
allImplement strict input validation for all data passed to Outside In Technology components
🧯 If You Can't Patch
- Implement network controls to restrict HTTP 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 use Outside In Technology for document processingCheck Version:
Check Oracle documentation or installation logs for Outside In Technology version informationVerify Fix Applied:
Verify that patches from Oracle CPU October 2021 have been applied and test document processing functionality📡 Detection & Monitoring
Log Indicators:
- Application crashes or hangs related to document processing
- Error logs from Outside In Technology components
- Abnormal termination of services using Outside In
Network Indicators:
- HTTP requests to document processing endpoints followed by service disruption
- Unusual traffic patterns to applications using Outside In Technology
SIEM Query:
Search for application crash events or service termination events in systems running Oracle Fusion Middleware