CVE-2021-21451
📋 TL;DR
CVE-2021-21451 is a vulnerability in SAP 3D Visual Enterprise Viewer version 9 that allows attackers to crash the application by tricking users into opening malicious SGI files. This improper input validation flaw causes denial of service, requiring application restart. Users who open untrusted SGI files with this viewer are affected.
💻 Affected Systems
- SAP 3D Visual Enterprise Viewer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service, potentially disrupting business workflows that rely on 3D visualization.
Likely Case
Temporary application unavailability requiring user restart, causing productivity loss for affected users.
If Mitigated
No impact if users only open trusted files or application is patched.
🎯 Exploit Status
Exploitation requires user interaction to open malicious file.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply SAP Note 3002617
Vendor Advisory: https://launchpad.support.sap.com/#/notes/3002617
Restart Required: Yes
Instructions:
1. Download patch from SAP Note 3002617. 2. Apply patch to SAP 3D Visual Enterprise Viewer installation. 3. Restart the application.
🔧 Temporary Workarounds
Restrict SGI file handling
allConfigure system to open SGI files with alternative applications or block SGI file execution in SAP 3D Visual Enterprise Viewer.
User awareness training
allTrain users to only open SGI files from trusted sources and recognize phishing attempts.
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of untrusted SGI files.
- Use network segmentation to isolate systems running vulnerable viewer from untrusted networks.
🔍 How to Verify
Check if Vulnerable:
Check if SAP 3D Visual Enterprise Viewer version 9 is installed without SAP Note 3002617 applied.Check Version:
Check application about dialog or installation directory for version information.Verify Fix Applied:
Verify SAP Note 3002617 is applied and application version shows as patched.📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Unexpected termination events
- Error messages related to SGI file parsing
Network Indicators:
- Downloads of SGI files from untrusted sources
- Network shares distributing SGI files
SIEM Query:
EventID: 1000 OR EventID: 1001 AND ProcessName: "SAP 3D Visual Enterprise Viewer" AND FileExtension: ".sgi"