CVE-2021-47758
📋 TL;DR
CVE-2021-47758 allows authenticated attackers to upload malicious PHP plugins through Chikitsa Patient Management System's module upload functionality, enabling remote code execution on the server. This affects all organizations using Chikitsa 2.0.2 for patient management, potentially exposing sensitive medical data and system control.
💻 Affected Systems
- Chikitsa Patient Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data exfiltration of sensitive patient records, ransomware deployment, or use as a pivot point for network attacks.
Likely Case
Unauthorized access to patient data, installation of backdoors, and potential compliance violations under healthcare regulations.
If Mitigated
Limited impact with proper file upload restrictions and network segmentation, though authentication bypass could still pose risks.
🎯 Exploit Status
Exploit requires authenticated access; public exploit code is available in Exploit-DB (ID 50571).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.3 or later
Vendor Advisory: https://www.chikitsa.io/
Restart Required: No
Instructions:
1. Backup your database and application files. 2. Download the latest version from the official website. 3. Replace the existing installation files with the updated version. 4. Verify module upload functionality is properly restricted.
🔧 Temporary Workarounds
Disable Module Upload
allTemporarily disable the module upload functionality in Chikitsa configuration.
Edit configuration file to remove or comment out module upload settings
File Upload Restrictions
linuxConfigure web server to block PHP file uploads through ZIP extraction.
Add .htaccess rule: <FilesMatch "\.(php|php5|php7|phtml)$">
Deny from all
</FilesMatch>
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Chikitsa server from critical systems
- Deploy web application firewall (WAF) with rules to block malicious file uploads and PHP execution attempts
🔍 How to Verify
Check if Vulnerable:
Check if running Chikitsa version 2.0.2 and test if authenticated users can upload ZIP files containing PHP scripts through module upload.Check Version:
Check Chikitsa admin panel or version file in installation directoryVerify Fix Applied:
Verify version is 2.0.3 or later and test that PHP file uploads through ZIP archives are properly blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to module directory
- PHP file creation in upload directories
- Multiple failed upload attempts
Network Indicators:
- HTTP POST requests to upload endpoints with ZIP files
- Subsequent connections to uploaded PHP files
SIEM Query:
source="web_server" AND (uri="/module/upload" OR uri LIKE "%.php") AND method="POST"