CVE-2023-43269
📋 TL;DR
CVE-2023-43269 is an arbitrary file upload vulnerability in pigcms that allows attackers to upload malicious files to the server. This affects all pigcms installations up to version 7.0, potentially leading to remote code execution or server compromise.
💻 Affected Systems
- pigcms
📦 What is this software?
Pigcms by Pigcms
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise leading to data theft, ransomware deployment, or complete system takeover.
Likely Case
Webshell upload enabling persistent backdoor access, data exfiltration, and lateral movement within the network.
If Mitigated
File upload blocked at perimeter, limiting impact to file storage corruption only.
🎯 Exploit Status
Simple HTTP file upload exploitation with publicly available proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
Upgrade to pigcms version beyond 7.0 if available, otherwise implement workarounds.
🔧 Temporary Workarounds
Web Application Firewall Rule
allBlock file uploads to vulnerable endpoints using WAF rules.
WAF-specific configuration required
File Upload Restriction
allImplement server-side file type validation and restrict upload directories.
Modify pigcms upload handler to validate file extensions and MIME types
🧯 If You Can't Patch
- Isolate pigcms server in network segment with strict egress filtering
- Implement application-level file upload validation and sanitization
🔍 How to Verify
Check if Vulnerable:
Check pigcms version in admin panel or configuration files. If version ≤7.0, assume vulnerable.Check Version:
Check pigcms configuration files or admin interface for version informationVerify Fix Applied:
Test file upload functionality with malicious file extensions to confirm blocking.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to pigcms endpoints
- Files with executable extensions in upload directories
Network Indicators:
- HTTP POST requests to upload endpoints with suspicious file types
SIEM Query:
source="web_server" AND (uri_path="*upload*" OR uri_path="*file*" OR method="POST") AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp" OR file_extension="exe")