CVE-2023-38704
📋 TL;DR
CVE-2023-38704 is a remote code execution vulnerability in import-in-the-middle, a module loading interceptor for ESM modules. It allows attackers to execute arbitrary code when user-supplied input is passed directly to the import() function. This affects applications using vulnerable versions of import-in-the-middle, particularly those that dynamically import modules based on user input.
💻 Affected Systems
- import-in-the-middle
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to execute arbitrary code with application privileges, potentially leading to data theft, system takeover, or lateral movement.
Likely Case
Remote code execution leading to application compromise, data exfiltration, or deployment of malware/backdoors.
If Mitigated
No impact if user input is properly validated or the vulnerability is patched.
🎯 Exploit Status
The vulnerability is straightforward to exploit if an application passes unsanitized user input to import().
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.4.2
Vendor Advisory: https://github.com/DataDog/import-in-the-middle/security/advisories/GHSA-5r27-rw8r-7967
Restart Required: Yes
Instructions:
1. Update import-in-the-middle to version 1.4.2 or later using npm update import-in-the-middle. 2. Restart the Node.js application. 3. Verify the update with npm list import-in-the-middle.
🔧 Temporary Workarounds
Input validation
allDo not pass user-supplied input directly to import(). Validate against a whitelist of allowed module names.
Disable ESM loader hooks
allIf ESM support is not needed, ensure no loader hooks are enabled via command-line or NODE_OPTIONS environment variable.
unset NODE_OPTIONS
Remove --loader or --experimental-loader flags from Node.js startup
🧯 If You Can't Patch
- Implement strict input validation for any data passed to import() functions
- Disable import-in-the-middle by removing it from dependencies or disabling loader hooks
🔍 How to Verify
Check if Vulnerable:
Check package.json or run npm list import-in-the-middle to see if version is below 1.4.2Check Version:
npm list import-in-the-middle | grep import-in-the-middleVerify Fix Applied:
Confirm import-in-the-middle version is 1.4.2 or higher with npm list import-in-the-middle📡 Detection & Monitoring
Log Indicators:
- Unusual module import attempts
- Import errors with unexpected module names
- Process spawning from Node.js application
Network Indicators:
- Unexpected outbound connections from Node.js process
- Data exfiltration patterns
SIEM Query:
process.name:node AND (process.cmdline:*import* OR process.cmdline:*--loader*)🔗 References
- https://github.com/DataDog/import-in-the-middle/commit/2531cdd9d1d73f9eaa87c16967f60cb276c1971b
- https://github.com/DataDog/import-in-the-middle/security/advisories/GHSA-5r27-rw8r-7967
- https://github.com/DataDog/import-in-the-middle/commit/2531cdd9d1d73f9eaa87c16967f60cb276c1971b
- https://github.com/DataDog/import-in-the-middle/security/advisories/GHSA-5r27-rw8r-7967
