CVE-2025-8764
📋 TL;DR
This critical vulnerability in linlinjava litemall allows remote attackers to upload arbitrary files without restrictions via the /wx/storage/upload endpoint. Attackers can exploit this to upload malicious files like webshells or malware to compromise the server. All users running litemall versions up to 1.8.0 are affected.
💻 Affected Systems
- linlinjava litemall
📦 What is this software?
Litemall by Linlinjava
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise via webshell upload leading to data theft, ransomware deployment, or use as attack platform
Likely Case
Malicious file upload enabling backdoor access, data exfiltration, or lateral movement within network
If Mitigated
File upload attempts blocked or logged with no successful exploitation
🎯 Exploit Status
Exploit details are publicly disclosed in GitHub issues; attack requires file upload capability but no authentication bypass
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.8.1 or later
Vendor Advisory: https://github.com/linlinjava/litemall/issues/567
Restart Required: No
Instructions:
1. Update litemall to version 1.8.1 or later. 2. Verify the /wx/storage/upload endpoint now validates file types and extensions. 3. Test file upload functionality.
🔧 Temporary Workarounds
Disable vulnerable endpoint
allTemporarily disable or block access to the /wx/storage/upload endpoint
# In web server config (e.g., nginx): location /wx/storage/upload { deny all; }
# In application firewall: Block requests to /wx/storage/upload
Implement file upload restrictions
allAdd server-side validation for file types, extensions, and size limits
# Example in application code: Validate file extension, MIME type, and size before processing
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block malicious file upload patterns
- Restrict network access to the litemall instance using firewall rules
🔍 How to Verify
Check if Vulnerable:
Check if litemall version is 1.8.0 or earlier and the /wx/storage/upload endpoint accepts unrestricted file uploadsCheck Version:
Check litemall version in application configuration or via package managerVerify Fix Applied:
Test file upload with restricted file types (e.g., .php, .exe) - they should be rejected in patched versions📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /wx/storage/upload
- Uploads of executable files or scripts
- Multiple failed upload attempts
Network Indicators:
- HTTP POST requests to /wx/storage/upload with suspicious file extensions
- Unusual outbound connections after file uploads
SIEM Query:
source="web_server" AND uri="/wx/storage/upload" AND (file_extension IN ("php", "exe", "jsp", "asp") OR status_code=200)