CVE-2025-70073
📋 TL;DR
A remote code execution vulnerability in ChestnutCMS v1.5.8 and earlier allows attackers to execute arbitrary code through the template creation function. This affects all systems running vulnerable versions of ChestnutCMS, potentially compromising the entire web server.
💻 Affected Systems
- ChestnutCMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, malware deployment, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Webshell deployment allowing file system access, data exfiltration, and further exploitation of the hosting environment.
If Mitigated
Limited impact if proper network segmentation, web application firewalls, and least privilege principles are implemented.
🎯 Exploit Status
Exploitation requires authentication to access template creation functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://github.com/liweiyi/ChestnutCMS/issues/8
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Disable Template Creation
allRemove or restrict access to template creation functionality in ChestnutCMS admin interface.
Modify CMS configuration to disable template management module
Web Application Firewall Rules
allImplement WAF rules to block suspicious template creation requests and code execution patterns.
Add WAF rules to detect and block template file uploads with executable code
🧯 If You Can't Patch
- Isolate ChestnutCMS instance in a dedicated network segment with strict egress filtering
- Implement strict access controls and multi-factor authentication for admin accounts
🔍 How to Verify
Check if Vulnerable:
Check ChestnutCMS version in admin panel or configuration files. Versions 1.5.8 and earlier are vulnerable.Check Version:
Check CMS version in admin dashboard or examine version files in installation directoryVerify Fix Applied:
Test template creation functionality with malicious payloads after implementing workarounds.📡 Detection & Monitoring
Log Indicators:
- Unusual template creation events
- File uploads with executable extensions
- Suspicious POST requests to template endpoints
Network Indicators:
- Outbound connections from web server to unknown IPs
- Unusual traffic patterns from CMS admin interface
SIEM Query:
source="chestnutcms" AND (event="template_create" OR event="file_upload") AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp")