CVE-2023-36347
📋 TL;DR
CVE-2023-36347 is an authentication bypass vulnerability in POS Codekop v2.0 that allows unauthenticated attackers to access sensitive selling data through the excel.php endpoint. This affects all organizations using the vulnerable version of POS Codekop software. Attackers can download confidential business data without any credentials.
💻 Affected Systems
- POS Codekop
📦 What is this software?
Codekop by Codekop
⚠️ Risk & Real-World Impact
Worst Case
Complete exposure of all sales data including customer information, transaction records, and financial data, potentially leading to data theft, regulatory fines, and business disruption.
Likely Case
Unauthorized access to sales data leading to information disclosure, potential data exfiltration, and privacy violations.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external access to the vulnerable endpoint.
🎯 Exploit Status
Exploitation requires only HTTP requests to the vulnerable endpoint. Public proof-of-concept demonstrates simple curl commands to access data.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check for official updates from POS Codekop developers. 2. If no patch available, implement workarounds. 3. Consider migrating to alternative POS software if security updates are not provided.
🔧 Temporary Workarounds
Block excel.php endpoint
allRestrict access to the vulnerable excel.php endpoint using web server configuration or firewall rules.
# Apache: <Location /excel.php> Require all denied </Location>
# Nginx: location ~ /excel\.php$ { deny all; }
Implement authentication middleware
allAdd authentication checks before processing requests to excel.php endpoint.
# Add to excel.php: if(!isset($_SESSION['authenticated']) || $_SESSION['authenticated'] !== true) { header('HTTP/1.0 403 Forbidden'); exit; }
🧯 If You Can't Patch
- Implement network segmentation to isolate POS Codekop system from untrusted networks
- Deploy web application firewall (WAF) with rules to block unauthorized access to excel.php
🔍 How to Verify
Check if Vulnerable:
Attempt to access http://[pos-system-url]/excel.php without authentication. If it returns sales data without login, the system is vulnerable.Check Version:
Check the software version in admin panel or look for version information in source code files.Verify Fix Applied:
After implementing fixes, verify that accessing excel.php without proper authentication returns 403 Forbidden or redirects to login.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated requests to /excel.php endpoint
- Multiple failed authentication attempts followed by excel.php access
- Unusual download patterns from excel.php
Network Indicators:
- HTTP GET requests to /excel.php without authentication headers
- Unusual data exfiltration patterns from POS system
SIEM Query:
source="web_server_logs" AND (url_path="/excel.php" AND NOT (user_agent="browser" OR auth_status="success"))