CVE-2025-24042
📋 TL;DR
This vulnerability in Visual Studio Code's JS Debug Extension allows attackers to escalate privileges when debugging JavaScript applications. It affects developers using VS Code with the JS Debug extension enabled. The vulnerability could allow execution of arbitrary code with elevated permissions.
💻 Affected Systems
- Visual Studio Code
- VS Code JS Debug Extension
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary code with the privileges of the VS Code process, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Local privilege escalation allowing attacker to gain higher privileges than intended, potentially accessing sensitive files or system resources.
If Mitigated
Limited impact if proper access controls and least privilege principles are implemented, with potential for unauthorized file access but not full system compromise.
🎯 Exploit Status
Exploitation requires local access or social engineering to trigger debugging of malicious JavaScript. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest VS Code version (1.90.0 or later) and ensure JS Debug extension is updated
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24042
Restart Required: No
Instructions:
1. Open VS Code. 2. Click on Extensions view (Ctrl+Shift+X). 3. Search for 'JavaScript Debugger'. 4. Click Update if available. 5. Alternatively, update VS Code itself through Help > Check for Updates.
🔧 Temporary Workarounds
Disable JS Debug Extension
allTemporarily disable the vulnerable extension until patching is possible
code --disable-extension ms-vscode.js-debug
Restrict Debugging Privileges
allRun VS Code with reduced privileges and limit debugging capabilities
🧯 If You Can't Patch
- Disable automatic debugging of untrusted JavaScript files
- Implement application allowlisting to restrict which applications can be debugged
- Run VS Code in sandboxed or containerized environments
🔍 How to Verify
Check if Vulnerable:
Check VS Code version and JS Debug extension version. Vulnerable if using pre-patch versions.Check Version:
code --versionVerify Fix Applied:
Verify VS Code is version 1.90.0 or later and JS Debug extension shows no available updates.📡 Detection & Monitoring
Log Indicators:
- Unusual debugging sessions, unexpected privilege escalation attempts in VS Code process logs
Network Indicators:
- Unusual outbound connections from VS Code process during debugging sessions
SIEM Query:
Process creation where parent process is 'code.exe' and command line contains debug or elevated privilege indicators