CVE-2021-34915
📋 TL;DR
This is a buffer overflow vulnerability in Bentley View's J2K file parser that allows remote code execution when a user opens a malicious J2K file or visits a malicious webpage. Attackers can exploit this to run arbitrary code with the privileges of the current user. Users of affected Bentley View versions are at risk.
💻 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, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation leading to data exfiltration, installation of backdoors, or credential harvesting from the compromised user account.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially resulting in application crash but no code execution.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) but no authentication. The vulnerability is well-documented with public advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Bentley View 10.16.0.80 or later
Vendor Advisory: https://www.bentley.com/en/common-vulnerability-exposure/BE-2021-0006
Restart Required: Yes
Instructions:
1. Download latest Bentley View from official Bentley website. 2. Run installer with administrative privileges. 3. Restart system after installation completes.
🔧 Temporary Workarounds
Disable J2K file association
windowsRemove file association for .j2k files to prevent automatic opening in Bentley View
reg delete "HKEY_CLASSES_ROOT\.j2k" /f
reg delete "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.j2k" /f
Application control policy
allBlock execution of Bentley View via application whitelisting
🧯 If You Can't Patch
- Implement network segmentation to isolate systems running vulnerable Bentley View versions
- Deploy endpoint detection and response (EDR) solutions to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Bentley View version via Help > About menu or examine installed programs in Control PanelCheck Version:
wmic product where name="Bentley View" get versionVerify Fix Applied:
Verify version is 10.16.0.80 or later and test with known safe J2K files📡 Detection & Monitoring
Log Indicators:
- Application crashes of Bentley View with memory access violations
- Unusual process creation from Bentley View executable
Network Indicators:
- Downloads of J2K files from untrusted sources
- Outbound connections from Bentley View to suspicious IPs
SIEM Query:
process_name:"Bentley View" AND (event_id:1000 OR event_id:1001) OR file_extension:".j2k" AND download_source:external