CVE-2021-41392
📋 TL;DR
CVE-2021-41392 is a critical remote code execution vulnerability in Boost Note desktop application. Attackers can send malicious IPC messages to exploit the exposed ipcRenderer interface, which then calls Electron's dangerous openExternal API to execute arbitrary commands. All users of vulnerable Boost Note versions are affected.
💻 Affected Systems
- Boost Note
📦 What is this software?
Boostnote by Boostnote
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands with user privileges, install malware, steal data, or pivot to other systems.
Likely Case
Remote code execution leading to data theft, ransomware deployment, or credential harvesting from the compromised system.
If Mitigated
Limited impact if application runs in sandboxed environment with restricted permissions and network segmentation.
🎯 Exploit Status
Exploitation requires sending crafted IPC messages to the vulnerable interface. Public GitHub issues demonstrate the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 0.22.0
Vendor Advisory: https://github.com/BoostIO/BoostNote-App/issues/856
Restart Required: Yes
Instructions:
1. Update Boost Note to version after 0.22.0. 2. Download from official sources. 3. Uninstall old version. 4. Install updated version. 5. Restart system if prompted.
🔧 Temporary Workarounds
Disable or restrict Boost Note network access
allBlock Boost Note from receiving external network communications using firewall rules.
# Linux: sudo iptables -A OUTPUT -p tcp --dport [BoostNotePort] -j DROP
# Windows: New-NetFirewallRule -DisplayName "Block BoostNote" -Direction Outbound -Program "C:\Path\To\BoostNote.exe" -Action Block
Run in isolated environment
allRun Boost Note in sandboxed or virtualized environment to limit impact.
# Use Docker: docker run --rm -it --security-opt no-new-privileges boostnote
# Use Windows Sandbox or similar isolation tools
🧯 If You Can't Patch
- Immediately disconnect vulnerable systems from networks and internet access
- Implement strict application whitelisting to prevent unauthorized process execution
🔍 How to Verify
Check if Vulnerable:
Check Boost Note version in application settings or About section. If version is 0.22.0 or earlier, system is vulnerable.Check Version:
# Windows: wmic product where name="Boost Note" get version
# Linux/Mac: boostnote --version or check About in applicationVerify Fix Applied:
Verify Boost Note version is after 0.22.0. Test by attempting to send IPC messages to the application interface.📡 Detection & Monitoring
Log Indicators:
- Unusual IPC message patterns in application logs
- Suspicious child process creation from Boost Note
- Unexpected network connections from Boost Note process
Network Indicators:
- Unusual IPC/RPC traffic to Boost Note application port
- External connections from Boost Note to unexpected destinations
SIEM Query:
process_name:"Boost Note" AND (event_type:"process_create" OR event_type:"network_connection")