CVE-2025-25761
📋 TL;DR
HkCms v2.3.2.240702 contains an arbitrary file write vulnerability in Appcenter.php that allows attackers to write malicious files to the server. This affects all systems running this specific version of HkCms. Attackers could potentially gain control of affected systems.
💻 Affected Systems
- HkCms
📦 What is this software?
Hkcms by Hkcms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to data theft, ransomware deployment, or persistent backdoor installation
Likely Case
Webshell upload leading to unauthorized access and potential lateral movement within the network
If Mitigated
Limited impact with proper file permission restrictions and input validation
🎯 Exploit Status
Requires some level of access or authentication to exploit the Appcenter.php component
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.3.3 or later
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Backup current installation. 2. Download latest version from official source. 3. Replace Appcenter.php with patched version. 4. Verify file permissions are properly set.
🔧 Temporary Workarounds
Restrict File Write Permissions
allSet strict file permissions on writable directories to prevent arbitrary file writes
chmod 755 /path/to/hkcms/writable/directories
chown www-data:www-data /path/to/hkcms
Input Validation Filter
allAdd input validation to Appcenter.php to filter malicious file paths
Add path validation in Appcenter.php before file write operations
🧯 If You Can't Patch
- Disable or restrict access to Appcenter.php component
- Implement web application firewall with file write protection rules
🔍 How to Verify
Check if Vulnerable:
Check if HkCms version is exactly v2.3.2.240702 by examining version files or configurationCheck Version:
grep -r '2.3.2.240702' /path/to/hkcms/installation/Verify Fix Applied:
Verify Appcenter.php has been updated and test file write functionality with safe test files📡 Detection & Monitoring
Log Indicators:
- Unusual file write operations in Appcenter.php logs
- Multiple failed file write attempts
- Suspicious file extensions being written
Network Indicators:
- Unusual POST requests to Appcenter.php with file parameters
- Traffic patterns indicating file upload exploitation
SIEM Query:
source="web_logs" AND uri="*Appcenter.php*" AND (method="POST" OR method="PUT") AND size>1000000