CVE-2024-4881
📋 TL;DR
A path traversal vulnerability in parisneo/lollms allows attackers to read or delete any file on Windows systems by exploiting improper path validation between Windows and Linux environments. This affects version 9.4.0 and potentially earlier versions, specifically through the /user_infos endpoint. Attackers can access sensitive files like configuration data, environment variables, and database files.
💻 Affected Systems
- parisneo/lollms
📦 What is this software?
Lollms by Lollms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through reading of sensitive files (credentials, configuration secrets) followed by lateral movement or data exfiltration.
Likely Case
Unauthorized access to sensitive system files, configuration data, and potentially application data leading to information disclosure.
If Mitigated
Limited impact with proper network segmentation and file system permissions restricting access to critical files.
🎯 Exploit Status
Exploit requires crafting requests with backslashes to traverse directories. References show proof-of-concept details in public bounty reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 5.9.0
Vendor Advisory: https://github.com/parisneo/lollms/commit/95ad36eeffc6a6be3e3f35ed35a384d768f0ecf6
Restart Required: Yes
Instructions:
1. Update lollms to version 5.9.0 or later. 2. Restart the application service. 3. Verify the fix by testing path traversal attempts.
🔧 Temporary Workarounds
Input Validation Filter
allImplement middleware to sanitize file paths by replacing backslashes with forward slashes and validating against allowed directories.
Implement custom request handler to sanitize path parameters before processing
Network Restriction
allRestrict access to the /user_infos endpoint to trusted IP addresses only.
Configure firewall rules to limit access to application port from authorized sources
🧯 If You Can't Patch
- Implement strict file system permissions to limit application user access to only necessary directories.
- Deploy web application firewall (WAF) rules to block requests containing path traversal patterns.
🔍 How to Verify
Check if Vulnerable:
Test the /user_infos endpoint with crafted requests containing backslash path traversal sequences (e.g., \windows\win.ini).Check Version:
Check application version through interface or configuration files; for lollms, review package.json or application metadata.Verify Fix Applied:
After patching, attempt the same path traversal requests and verify they are rejected or sanitized.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /user_infos containing backslashes or unusual path patterns
- File access errors for system files in application logs
Network Indicators:
- Unusual outbound file transfers from application server
- HTTP requests with path traversal patterns in URI
SIEM Query:
source="web_logs" AND uri="/user_infos" AND (uri CONTAINS "\\" OR uri CONTAINS "..")