CVE-2025-1451
📋 TL;DR
This vulnerability in parisneo/lollms-webui allows attackers to cause denial of service by sending specially crafted file upload requests with excessively long multipart boundaries. The server fails to validate boundary length and character composition, leading to resource exhaustion. All users running vulnerable versions of lollms-webui are affected.
💻 Affected Systems
- parisneo/lollms-webui
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability due to resource exhaustion, potentially requiring server restart and causing extended downtime.
Likely Case
Temporary service degradation or unavailability during attack, with potential for repeated exploitation.
If Mitigated
Minimal impact with proper rate limiting and boundary validation in place.
🎯 Exploit Status
Exploitation requires crafting specific HTTP requests but doesn't require authentication to the web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after commit that properly fixes boundary validation
Vendor Advisory: https://huntr.com/bounties/63f5aea4-953b-4b38-9f10-3afe425be1d4
Restart Required: No
Instructions:
1. Update to the latest version of lollms-webui. 2. Verify the patch includes proper boundary length validation and character restrictions. 3. Restart the webui service if needed.
🔧 Temporary Workarounds
Implement request size limits
allConfigure web server or reverse proxy to limit maximum request size
nginx: client_max_body_size 10M;
apache: LimitRequestBody 10485760
Disable file uploads
allTemporarily disable file upload functionality if not required
Modify lollms-webui configuration to disable upload endpoints
🧯 If You Can't Patch
- Implement rate limiting on upload endpoints
- Use WAF with request size validation rules
🔍 How to Verify
Check if Vulnerable:
Check if running lollms-webui v13 or earlier with the incomplete patch from commit 483431bbCheck Version:
Check lollms-webui version in web interface or configuration filesVerify Fix Applied:
Verify the server properly validates multipart boundary length and rejects requests with boundaries longer than reasonable limits📡 Detection & Monitoring
Log Indicators:
- Unusually large HTTP requests
- Multiple failed upload attempts
- High memory/CPU usage spikes
Network Indicators:
- HTTP POST requests with extremely long Content-Type headers
- Abnormally large request payloads to upload endpoints
SIEM Query:
source="web_server_logs" AND (request_size>10000000 OR uri_path="/upload" AND status_code=413)