CVE-2022-27128
📋 TL;DR
CVE-2022-27128 is an authentication bypass vulnerability in zbzcms v1.0 that allows unauthenticated attackers to add administrator accounts via the /admin/run_ajax.php endpoint. This affects all installations of zbzcms v1.0 with the default configuration. Attackers can gain full administrative control of the CMS.
💻 Affected Systems
- zbzcms
📦 What is this software?
Zbzcms by Zbzcms
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the CMS installation allowing attackers to create admin accounts, modify content, upload malicious files, and potentially pivot to the underlying server.
Likely Case
Attackers create backdoor admin accounts to maintain persistent access, deface websites, or steal sensitive data stored in the CMS.
If Mitigated
With proper network segmentation and web application firewalls, exploitation attempts are blocked and logged for investigation.
🎯 Exploit Status
The vulnerability is simple to exploit with publicly available proof-of-concept code. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch exists. Recommended action is to upgrade to a different CMS or implement workarounds.
🔧 Temporary Workarounds
Block access to vulnerable endpoint
allRestrict access to /admin/run_ajax.php via web server configuration or firewall rules
# Apache: RewriteRule ^/admin/run_ajax\.php$ - [F,L]
# Nginx: location ~ /admin/run_ajax\.php$ { deny all; }
Implement authentication middleware
allAdd authentication checks to the run_ajax.php file to verify user is logged in as admin
# Add to top of /admin/run_ajax.php: session_start(); if(!isset($_SESSION['admin']) || $_SESSION['admin'] != true) { die('Access Denied'); }
🧯 If You Can't Patch
- Immediately remove zbzcms v1.0 from production and replace with secure alternative
- Implement strict network segmentation and monitor all traffic to the affected system
🔍 How to Verify
Check if Vulnerable:
Check if /admin/run_ajax.php exists and is accessible without authentication. Test with curl: curl -X POST http://target/admin/run_ajax.php -d 'action=add_admin&username=test&password=test'Check Version:
Check CMS version in admin panel or look for version markers in source filesVerify Fix Applied:
Verify the endpoint returns access denied or 403 error when accessed without proper admin authentication📡 Detection & Monitoring
Log Indicators:
- POST requests to /admin/run_ajax.php from unauthenticated IPs
- Successful admin account creation logs from unusual IPs
- Multiple failed authentication attempts followed by successful admin actions
Network Indicators:
- Unusual POST requests to admin endpoints from external IPs
- Traffic patterns showing admin panel access from new IP addresses
SIEM Query:
source="web_logs" AND uri="/admin/run_ajax.php" AND (status=200 OR status=302) AND NOT user_agent="internal_monitor"