CVE-2021-37543
📋 TL;DR
This vulnerability in JetBrains RubyMine IDE allows remote code execution without user confirmation when opening untrusted projects. Attackers could execute arbitrary code on a developer's system by tricking them into opening a malicious project. All RubyMine users working with untrusted projects are affected.
💻 Affected Systems
- JetBrains RubyMine
📦 What is this software?
Rubymine by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary code with user privileges, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Attackers execute malicious code on developer workstations to steal credentials, source code, or install backdoors for persistent access.
If Mitigated
Limited impact if developers only work with trusted projects and have proper endpoint protection in place.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious project). No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2021.1.1 and later
Vendor Advisory: https://blog.jetbrains.com/blog/2021/08/05/jetbrains-security-bulletin-q2-2021/
Restart Required: Yes
Instructions:
1. Open RubyMine. 2. Go to Help > Check for Updates. 3. Install update to version 2021.1.1 or later. 4. Restart RubyMine when prompted.
🔧 Temporary Workarounds
Avoid Untrusted Projects
allOnly open RubyMine projects from trusted sources. Do not open projects from unknown or untrusted origins.
Sandbox Execution
allRun RubyMine in a sandboxed or isolated environment when working with potentially untrusted projects.
🧯 If You Can't Patch
- Implement strict policy prohibiting opening untrusted RubyMine projects
- Deploy endpoint detection and response (EDR) solutions to monitor for suspicious process execution
🔍 How to Verify
Check if Vulnerable:
Check RubyMine version in Help > About. If version is below 2021.1.1, the system is vulnerable.Check Version:
On Linux/macOS: cat /Applications/RubyMine.app/Contents/Info.plist | grep -A1 CFBundleShortVersionString. On Windows: Check Help > About in RubyMine GUI.Verify Fix Applied:
After updating, verify version is 2021.1.1 or higher in Help > About.📡 Detection & Monitoring
Log Indicators:
- Unusual process execution from RubyMine
- Suspicious network connections initiated by RubyMine process
Network Indicators:
- Unexpected outbound connections from developer workstations running RubyMine
SIEM Query:
process_name:"rubymine.exe" OR process_name:"rubymine" AND (parent_process NOT IN ["explorer.exe", "launchd", "systemd"])