CVE-2023-44467
📋 TL;DR
This vulnerability in LangChain Experimental allows attackers to bypass previous security fixes and execute arbitrary Python code via __import__ statements. It affects users of langchain_experimental before version 0.0.306 who process untrusted input through PAL chains.
💻 Affected Systems
- langchain_experimental (LangChain Experimental)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution leading to complete system compromise, data theft, and lateral movement within the environment.
Likely Case
Arbitrary code execution within the application context, potentially allowing data exfiltration, privilege escalation, or further exploitation.
If Mitigated
Limited impact if input validation and sandboxing prevent code execution, though potential for denial of service remains.
🎯 Exploit Status
Exploitation requires ability to inject Python code into PAL chain processing
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.0.306 and later
Vendor Advisory: https://github.com/langchain-ai/langchain/commit/4c97a10bd0d9385cfee234a63b5bd826a295e483
Restart Required: Yes
Instructions:
1. Update langchain_experimental package using pip: pip install --upgrade langchain_experimental>=0.0.306
2. Restart all services using LangChain
3. Verify the update with pip show langchain_experimental
🔧 Temporary Workarounds
Disable PAL Chain Usage
allTemporarily disable or remove PAL chain functionality until patched
# Modify code to avoid using PAL chains or langchain_experimental.pal_chain
Input Validation and Sanitization
allImplement strict input validation to reject any code containing __import__ statements
# Add input validation: if '__import__' in user_input: raise ValueError('Invalid input')
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy application-level firewalls to monitor and block suspicious code execution attempts
🔍 How to Verify
Check if Vulnerable:
Check langchain_experimental version: pip show langchain_experimental | grep VersionCheck Version:
pip show langchain_experimental | grep VersionVerify Fix Applied:
Confirm version is 0.0.306 or higher and test that __import__ statements are properly blocked in PAL chains📡 Detection & Monitoring
Log Indicators:
- Unusual Python import statements in application logs
- Unexpected process execution from LangChain context
Network Indicators:
- Outbound connections from LangChain processes to unexpected destinations
SIEM Query:
process.name:python AND cmdline:*__import__* AND parent.process.name:langchain*