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CVE-2021-2423

7.5 HIGH
Denial of Service

📋 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

Products:
  • Oracle Fusion Middleware
  • Oracle Outside In Technology
Versions: 8.5.5
Operating Systems: All platforms supported by Oracle Outside In Technology
Default Config Vulnerable: ⚠️ Yes
Notes: The vulnerability exists in the Outside In Filters component. Impact depends on how applications use the SDK - highest risk when processing network-sourced data directly.

📦 What is this software?

Outside In Technology by Oracle

View all CVEs affecting Outside In Technology →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete denial of service for any application using Outside In Technology, potentially affecting multiple business functions that rely on document processing.

🟠

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.

🌐 Internet-Facing: HIGH - Unauthenticated network access via HTTP makes internet-facing systems particularly vulnerable to DoS attacks.
🏢 Internal Only: MEDIUM - Internal systems are still vulnerable but may have additional network controls reducing attack surface.

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

Oracle describes this as 'easily exploitable' with unauthenticated network access via HTTP. No public exploit code was found in initial research.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check Oracle Critical Patch Update for July 2021 or later versions

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. Apply the appropriate patch for your Oracle Fusion Middleware installation. 3. Restart affected services. 4. Verify patch application.

🔧 Temporary Workarounds

Network Segmentation

all

Restrict network access to systems using Outside In Technology to prevent unauthenticated HTTP access

Input Validation

all

Implement 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 to trusted sources
  • Deploy web application firewalls to filter malicious input before it reaches vulnerable components

🔍 How to Verify

Check if Vulnerable:

Check Oracle Fusion Middleware version and verify if Outside In Technology 8.5.5 is installed and in use

Check Version:

Oracle-specific version checking commands depend on installation method (OPatch, Oracle Home, etc.)

Verify Fix Applied:

Verify patch installation through Oracle patch management tools and confirm version is updated beyond 8.5.5

📡 Detection & Monitoring

Log Indicators:

  • Application crashes or hangs in Oracle Fusion Middleware logs
  • Error messages related to Outside In Filters processing failures

Network Indicators:

  • Unusual HTTP traffic patterns to document processing endpoints
  • Multiple connection attempts followed by service disruption

SIEM Query:

source="oracle_middleware" AND (event_type="crash" OR event_type="hang") AND component="Outside In Filters"

📊 Metadata

CVE ID: CVE-2021-2423
CVSS v3 Score: 7.5 (HIGH)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: July 21, 2021
Last Updated: November 21, 2024

🔗 References

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