CVE-2022-25498
📋 TL;DR
CVE-2022-25498 is a critical remote code execution vulnerability in CuppaCMS v1.0 that allows attackers to execute arbitrary code on affected systems via the saveConfigData function. This affects all installations of CuppaCMS v1.0, potentially compromising the entire web server. Attackers can gain complete control over vulnerable systems.
💻 Affected Systems
- CuppaCMS
📦 What is this software?
Cuppacms by Cuppacms
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Webshell deployment, credential harvesting, defacement, and data exfiltration from the compromised CMS and database.
If Mitigated
Limited impact if proper network segmentation, WAF rules, and file integrity monitoring are in place to detect and block exploitation attempts.
🎯 Exploit Status
Exploit code is publicly available and requires minimal technical skill to execute. The vulnerability is in an AJAX endpoint that doesn't require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/CuppaCMS/CuppaCMS/issues/29
Restart Required: No
Instructions:
1. Immediately remove CuppaCMS v1.0 from production environments. 2. Migrate to a different, actively maintained CMS platform. 3. The project appears abandoned with no official patch available.
🔧 Temporary Workarounds
Block vulnerable endpoint
allAdd web server rules to block access to /classes/ajax/Functions.php
# Apache: RewriteRule ^classes/ajax/Functions\.php$ - [F,L]
# Nginx: location ~ ^/classes/ajax/Functions\.php$ { deny all; }
File permission restriction
linuxRemove execute permissions from vulnerable PHP file
chmod -x /path/to/CuppaCMS/classes/ajax/Functions.php
🧯 If You Can't Patch
- Isolate the CuppaCMS instance in a separate network segment with strict outbound firewall rules
- Implement a Web Application Firewall (WAF) with rules to block RCE payloads and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if /classes/ajax/Functions.php exists and contains the saveConfigData function. Review file modification timestamps for unexpected changes.Check Version:
Check CuppaCMS configuration files or admin panel for version information. Look for 'CuppaCMS v1.0' in source code.Verify Fix Applied:
Verify the workaround rules are active by attempting to access /classes/ajax/Functions.php and confirming access is blocked (should return 403).📡 Detection & Monitoring
Log Indicators:
- POST requests to /classes/ajax/Functions.php with suspicious parameters
- Unusual file creation/modification in web directories
- PHP system/exec/shell_exec function calls in web logs
Network Indicators:
- Outbound connections from web server to unknown IPs/domains
- Unusual spikes in traffic to the vulnerable endpoint
SIEM Query:
source="web_logs" AND (url="/classes/ajax/Functions.php" OR url="/classes/ajax/Functions.php") AND (method="POST" OR params CONTAINS "system" OR params CONTAINS "exec" OR params CONTAINS "shell")