CVE-2025-13262
📋 TL;DR
A path traversal vulnerability in lsfusion platform allows remote attackers to manipulate file paths via the 'sid' parameter in UploadFileRequestHandler. This could enable unauthorized file access or upload outside intended directories. Affects lsfusion platform versions up to 6.1.
💻 Affected Systems
- lsfusion platform
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attackers could read sensitive system files, upload malicious files to arbitrary locations, or potentially achieve remote code execution.
Likely Case
Unauthorized file access leading to data leakage, configuration file exposure, or file system manipulation.
If Mitigated
Limited impact with proper input validation and file system permissions restricting traversal attempts.
🎯 Exploit Status
Public disclosure indicates exploit details are available; path traversal vulnerabilities typically have low exploitation complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.1 or later
Vendor Advisory: https://github.com/lsfusion/platform/issues/1544
Restart Required: Yes
Instructions:
1. Upgrade to lsfusion platform version 6.1 or later. 2. Restart the application server. 3. Verify the fix by testing file upload functionality.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to reject 'sid' parameters containing path traversal sequences like '../' or absolute paths.
Not applicable - requires code modification
File System Restrictions
linuxConfigure application to run with minimal file system permissions and restrict upload directory to specific, isolated location.
chmod 750 /path/to/upload/directory
chown appuser:appgroup /path/to/upload/directory
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block path traversal patterns in requests.
- Disable or restrict file upload functionality if not essential for business operations.
🔍 How to Verify
Check if Vulnerable:
Check lsfusion platform version; if version is 6.0 or earlier, system is vulnerable.Check Version:
Check application configuration files or run: java -jar lsfusion.jar --versionVerify Fix Applied:
After patching, attempt to exploit using known path traversal payloads in 'sid' parameter during file upload; requests should be rejected.📡 Detection & Monitoring
Log Indicators:
- HTTP requests with 'sid' parameter containing '../', '..\', or absolute paths
- File access errors outside expected upload directory
Network Indicators:
- HTTP POST requests to file upload endpoints with unusual parameter values
SIEM Query:
source="web_server" AND (uri_path="*upload*" AND (param="*../*" OR param="*..\\*"))