CVE-2020-28062
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on HisiPHP 2.0.11 systems through specially crafted packets that bypass access controls in the file upload functionality. It affects all deployments running the vulnerable version of HisiPHP. Attackers can exploit this without authentication to gain control of affected systems.
💻 Affected Systems
- HisiPHP
📦 What is this software?
Hisiphp by Hisiphp
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing remote code execution, data theft, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to web server compromise, data exfiltration, and potential ransomware deployment.
If Mitigated
Limited impact with proper network segmentation, web application firewalls, and file upload restrictions in place.
🎯 Exploit Status
Public GitHub issues demonstrate the vulnerability and exploitation appears straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.12 or later
Vendor Advisory: https://github.com/hisiphp/hisiphp/issues/10
Restart Required: No
Instructions:
1. Backup your current installation. 2. Download HisiPHP 2.0.12 or later from official source. 3. Replace vulnerable files with patched versions. 4. Verify file permissions and ownership.
🔧 Temporary Workarounds
Disable Plugin Upload Directory
linuxRemove or restrict access to the vulnerable upload directory
chmod 000 /path/to/hisiphp/Upload/Plugins/
rm -rf /path/to/hisiphp/Upload/Plugins/
Web Application Firewall Rules
allBlock requests containing suspicious upload patterns
🧯 If You Can't Patch
- Implement strict network segmentation to isolate HisiPHP from critical systems
- Deploy web application firewall with rules blocking file upload exploitation patterns
🔍 How to Verify
Check if Vulnerable:
Check HisiPHP version in admin panel or by examining source files for version 2.0.11Check Version:
grep -r "2.0.11" /path/to/hisiphp/ || php -r "include 'config.php'; echo \$config['version'];"Verify Fix Applied:
Verify version is 2.0.12 or later and test upload functionality with controlled payloads📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /Upload/Plugins/ directory
- POST requests with suspicious file extensions
- System command execution in web logs
Network Indicators:
- HTTP requests with crafted multipart/form-data payloads
- Outbound connections from web server to unknown IPs
SIEM Query:
source="web_logs" AND (uri="/Upload/Plugins/" OR file_extension IN ("php", "sh", "exe"))