CVE-2020-17023
📋 TL;DR
This CVE describes a remote code execution vulnerability in Visual Studio Code where opening a malicious package.json file allows arbitrary code execution. It affects Visual Studio Code users who open untrusted repositories. The attacker needs to trick users into cloning and opening malicious content.
💻 Affected Systems
- Visual Studio Code
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with administrative privileges, allowing attacker to install malware, steal data, create accounts, and maintain persistence.
Likely Case
Limited user account compromise leading to data theft, lateral movement within the network, and potential privilege escalation.
If Mitigated
No impact if patch applied or if users don't open untrusted package.json files in Visual Studio Code.
🎯 Exploit Status
Requires social engineering to trick user into opening malicious file. No authentication bypass needed but requires user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Visual Studio Code version with fix (specific version not provided in CVE description)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17023
Restart Required: Yes
Instructions:
1. Open Visual Studio Code. 2. Go to Help > Check for Updates. 3. Install the latest update. 4. Restart Visual Studio Code.
🔧 Temporary Workarounds
Avoid opening untrusted package.json files
allDo not open package.json files from untrusted sources in Visual Studio Code
Use alternative text editor for untrusted JSON
allOpen suspicious package.json files in a basic text editor instead of Visual Studio Code
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized code
- Restrict user privileges to limit impact if exploitation occurs
🔍 How to Verify
Check if Vulnerable:
Check Visual Studio Code version - if not updated after vulnerability disclosure (November 2020), assume vulnerableCheck Version:
code --version (on command line) or check About in Visual Studio Code menuVerify Fix Applied:
Verify Visual Studio Code is updated to latest version and no longer vulnerable to CVE-2020-17023📡 Detection & Monitoring
Log Indicators:
- Unusual process execution from Visual Studio Code
- Suspicious file opens of package.json files
Network Indicators:
- Downloads from untrusted repositories followed by Visual Studio Code activity
SIEM Query:
Process creation where parent process is 'code.exe' and command line contains suspicious patterns