CVE-2021-34880
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious 3DS files in Bentley View. It affects users of Bentley View 10.15.0.75 who open untrusted 3DS files, potentially leading to full system compromise.
💻 Affected Systems
- Bentley View
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the affected system, data theft, and lateral movement within the network.
Likely Case
Malware installation, data exfiltration, or ransomware deployment on the affected workstation.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially only application crash.
🎯 Exploit Status
Exploitation requires user interaction but is technically straightforward once a malicious file is opened.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.16.0.61 or later
Vendor Advisory: https://www.bentley.com/en/common-vulnerability-exposure/BE-2021-0004
Restart Required: Yes
Instructions:
1. Download latest Bentley View from official Bentley website. 2. Install the update. 3. Restart the application. 4. Verify version is 10.16.0.61 or higher.
🔧 Temporary Workarounds
Block 3DS file extensions
windowsPrevent Bentley View from opening .3ds files via file association changes.
Windows: assoc .3ds=
Windows: ftype 3dsfile=
Application sandboxing
allRun Bentley View in restricted environment to limit potential damage.
🧯 If You Can't Patch
- Implement strict file type policies to block .3ds files at email gateways and web proxies.
- Run Bentley View with minimal user privileges and in isolated environments.
🔍 How to Verify
Check if Vulnerable:
Check Bentley View version in Help > About. If version is exactly 10.15.0.75, system is vulnerable.Check Version:
On Windows: wmic product where name="Bentley View" get versionVerify Fix Applied:
Verify version is 10.16.0.61 or higher in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Application crashes when opening 3DS files
- Unusual process creation from Bentley View
Network Indicators:
- Outbound connections from Bentley View to unknown IPs
- DNS requests for suspicious domains after file open
SIEM Query:
process_name:"Bentley View.exe" AND (event_id:1000 OR event_id:1001) OR process_parent:"Bentley View.exe" AND process_name NOT IN (allowed_list)