CVE-2021-28477
📋 TL;DR
CVE-2021-28477 is a remote code execution vulnerability in Visual Studio Code that allows attackers to execute arbitrary code on a user's system by tricking them into opening a malicious workspace file. This affects users who open untrusted workspace files in Visual Studio Code. The vulnerability requires user interaction but can lead to full system compromise.
💻 Affected Systems
- Visual Studio Code
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the victim's machine, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive files, credentials, or system resources on the affected machine.
If Mitigated
Limited impact with proper security controls like application whitelisting, network segmentation, and user awareness training preventing successful exploitation.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious workspace file) but the technical complexity is low once the malicious file is executed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.56.0 and later
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28477
Restart Required: Yes
Instructions:
1. Open Visual Studio Code. 2. Click on Help menu. 3. Select Check for Updates. 4. Install version 1.56.0 or later. 5. Restart Visual Studio Code after installation.
🔧 Temporary Workarounds
Disable automatic workspace trust
allConfigure Visual Studio Code to require explicit trust for all workspace files
Add "security.workspace.trust.enabled": false to settings.json
Restrict workspace file execution
all🧯 If You Can't Patch
- Implement strict user awareness training about opening untrusted workspace files
- Use network segmentation to isolate systems running vulnerable Visual Studio Code versions
🔍 How to Verify
Check if Vulnerable:
Check Visual Studio Code version by opening Help > About. If version is below 1.56.0, the system is vulnerable.Check Version:
code --versionVerify Fix Applied:
Verify Visual Studio Code version is 1.56.0 or higher in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual process execution from Visual Studio Code
- Suspicious workspace file access patterns
- Unexpected network connections from code.exe
Network Indicators:
- Outbound connections to unknown IPs from Visual Studio Code process
- DNS queries for suspicious domains from code.exe
SIEM Query:
process_name:"code.exe" AND (parent_process:"explorer.exe" OR command_line:"*.code-workspace")