CVE-2023-37656
📋 TL;DR
WebsiteGuide v0.2 contains a critical vulnerability that allows attackers to execute arbitrary commands on the server by uploading specially crafted image files. This affects all systems running the vulnerable version of WebsiteGuide with image upload functionality enabled. Attackers can gain complete control of affected servers.
💻 Affected Systems
- WebsiteGuide
📦 What is this software?
Websiteguide by Websiteguide Project
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise allowing data theft, malware deployment, lateral movement, and persistent backdoor installation.
Likely Case
Attackers upload webshells to establish persistent access, steal sensitive data, and use the server for further attacks.
If Mitigated
Limited impact with proper file upload restrictions and server hardening, though risk remains if vulnerability exists.
🎯 Exploit Status
Exploit details are publicly available in GitHub issues. Simple file upload with crafted payload can trigger RCE.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch exists. Consider migrating to alternative software or implementing strict workarounds.
🔧 Temporary Workarounds
Disable Image Upload
allCompletely disable image upload functionality in WebsiteGuide configuration
Edit WebsiteGuide configuration to remove/disable upload features
Implement Strict File Upload Validation
allAdd server-side validation for uploaded files including file type verification, size limits, and content scanning
Implement file type checking using MIME types and file signatures
Set maximum upload size limits
Scan uploaded files for malicious content
🧯 If You Can't Patch
- Isolate WebsiteGuide server in restricted network segment with no internet access
- Implement web application firewall (WAF) rules to block suspicious file upload patterns
🔍 How to Verify
Check if Vulnerable:
Check if running WebsiteGuide v0.2 with image upload functionality enabled. Review configuration files for upload settings.Check Version:
Check WebsiteGuide version in application files or configuration. Typically in README, package.json, or version files.Verify Fix Applied:
Test image upload functionality with various file types to ensure only legitimate images are accepted. Attempt to upload files with executable extensions.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with non-image extensions
- Large file uploads
- Multiple failed upload attempts
- Commands executed from web directory
Network Indicators:
- HTTP POST requests to upload endpoints with unusual file types
- Outbound connections from web server to suspicious IPs
SIEM Query:
source="webserver" AND (url="*upload*" OR method="POST") AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp" OR file_extension="exe")