CVE-2023-25654
📋 TL;DR
CVE-2023-25654 is a critical remote code execution vulnerability in baserCMS management systems. Attackers can execute arbitrary code on affected servers, potentially taking full control. All baserCMS installations prior to version 4.7.5 are vulnerable.
💻 Affected Systems
- baserCMS
📦 What is this software?
Basercms by Basercms
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise allowing attackers to execute arbitrary commands, steal data, install malware, pivot to other systems, and maintain persistent access.
Likely Case
Attackers gain administrative access to the CMS, deface websites, steal sensitive data, and use the server for further attacks.
If Mitigated
With proper network segmentation and least privilege, impact limited to the web application layer, though data exposure and service disruption still possible.
🎯 Exploit Status
Exploitation requires access to the management system, but once accessed, RCE is straightforward. Public exploit code exists in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.7.5
Vendor Advisory: https://github.com/baserproject/basercms/security/advisories/GHSA-h4cc-fxpp-pgw9
Restart Required: Yes
Instructions:
1. Backup your baserCMS installation and database. 2. Download baserCMS 4.7.5 from official repository. 3. Replace existing files with patched version. 4. Clear cache and restart web server. 5. Verify functionality.
🔧 Temporary Workarounds
Restrict Management System Access
linuxLimit access to baserCMS management interface using network controls
iptables -A INPUT -p tcp --dport 80 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Web Application Firewall Rules
allImplement WAF rules to block suspicious management system requests
🧯 If You Can't Patch
- Isolate the baserCMS server in a DMZ with strict inbound/outbound firewall rules
- Implement application-level monitoring and alerting for suspicious management system activity
🔍 How to Verify
Check if Vulnerable:
Check baserCMS version in admin panel or via file inspection. Versions below 4.7.5 are vulnerable.Check Version:
grep -r "BASERCMS_VERSION" /path/to/basercms/ | head -1Verify Fix Applied:
Confirm version is 4.7.5 or higher in admin panel. Check that commit 002886be0998c74c386e04f0b43688a8a45d7a96 is present.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads in management system logs
- Suspicious PHP execution attempts
- Unexpected system command execution
Network Indicators:
- Unusual outbound connections from web server
- Traffic to management interface from unexpected sources
SIEM Query:
source="basercms_logs" AND (event="file_upload" OR event="command_execution")🔗 References
- https://github.com/baserproject/basercms/commit/002886be0998c74c386e04f0b43688a8a45d7a96
- https://github.com/baserproject/basercms/commit/08247f0a633d8e836ce2e5cd2d53aa19901a1359
- https://github.com/baserproject/basercms/commit/60f83054d8131b0ace60716cec7e629b5eb3a8f0
- https://github.com/baserproject/basercms/releases/tag/basercms-4.7.5
- https://github.com/baserproject/basercms/security/advisories/GHSA-h4cc-fxpp-pgw9
- https://github.com/baserproject/basercms/commit/002886be0998c74c386e04f0b43688a8a45d7a96
- https://github.com/baserproject/basercms/commit/08247f0a633d8e836ce2e5cd2d53aa19901a1359
- https://github.com/baserproject/basercms/commit/60f83054d8131b0ace60716cec7e629b5eb3a8f0
- https://github.com/baserproject/basercms/releases/tag/basercms-4.7.5
- https://github.com/baserproject/basercms/security/advisories/GHSA-h4cc-fxpp-pgw9
