CVE-2021-21453
📋 TL;DR
CVE-2021-21453 is a vulnerability in SAP 3D Visual Enterprise Viewer version 9 that allows attackers to crash the application by tricking users into opening malicious RLE files. This improper input validation flaw causes denial of service, requiring application restart. Organizations using this SAP viewer software are affected.
💻 Affected Systems
- SAP 3D Visual Enterprise Viewer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service for the 3D viewer application, potentially disrupting business processes that rely on viewing 3D models
Likely Case
Application crashes when users open malicious RLE files, requiring restart and causing temporary productivity loss
If Mitigated
Minimal impact with proper file handling policies and user awareness training
🎯 Exploit Status
Requires user interaction to open malicious file, but exploitation is straightforward once file is opened
🛠️ 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 to affected SAP 3D Visual Enterprise Viewer installations. 3. Restart the application.
🔧 Temporary Workarounds
Restrict RLE file handling
allBlock or restrict opening of RLE files in the SAP 3D viewer
User awareness training
allTrain users not to open RLE files from untrusted sources
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized file execution
- Use email filtering to block RLE attachments and implement network segmentation
🔍 How to Verify
Check if Vulnerable:
Check if SAP 3D Visual Enterprise Viewer version 9 is installed without SAP Note 3002617 appliedCheck Version:
Check application about dialog or installation logs for version informationVerify Fix Applied:
Verify SAP Note 3002617 is applied and application version is updated📡 Detection & Monitoring
Log Indicators:
- Application crash logs related to RLE file processing
- Error messages mentioning memory access violations
Network Indicators:
- Unusual RLE file downloads to workstations
- File transfer patterns to users with SAP viewer installed
SIEM Query:
source="application_logs" AND ("SAP 3D Viewer" OR "VEViewer") AND ("crash" OR "exception" OR "RLE")