CVE-2021-44160
📋 TL;DR
CVE-2021-44160 allows remote attackers to bypass authentication in Carinal Tien Hospital Health Report System by modifying cookie parameters. This enables privilege escalation to general user accounts, potentially leading to unauthorized data access or modification. The vulnerability affects systems running the vulnerable version of this healthcare reporting software.
💻 Affected Systems
- Carinal Tien Hospital Health Report System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could modify patient health records, disrupt healthcare services, or compromise sensitive medical data, potentially affecting patient care and violating privacy regulations.
Likely Case
Unauthorized access to patient records, modification of health report data, and service disruption for legitimate users.
If Mitigated
Limited impact with proper authentication controls, but still represents a security weakness that could be chained with other vulnerabilities.
🎯 Exploit Status
The vulnerability requires only cookie manipulation, which can be done with basic web testing tools. No authentication is required to initiate the attack.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version - Contact Carinal Tien Hospital IT department
Vendor Advisory: https://www.twcert.org.tw/tw/cp-132-5429-4185b-1.html
Restart Required: Yes
Instructions:
1. Contact Carinal Tien Hospital IT department for patched version
2. Apply the security update provided by the hospital
3. Restart the Health Report System service
4. Verify authentication mechanisms are properly implemented
🔧 Temporary Workarounds
Implement Strong Session Management
allAdd server-side session validation and implement proper authentication checks
Implement server-side session validation in application code
Add authentication middleware that validates user sessions on each request
Web Application Firewall Rules
allConfigure WAF to detect and block cookie manipulation attempts
Configure WAF to monitor for unusual cookie modifications
Set up rules to block requests with manipulated session cookies
🧯 If You Can't Patch
- Implement network segmentation to restrict access to the Health Report System
- Deploy a reverse proxy with additional authentication layer and session validation
🔍 How to Verify
Check if Vulnerable:
Test if modifying cookie parameters allows access to other user accounts without proper authentication. Use web testing tools to manipulate session cookies.Check Version:
Contact Carinal Tien Hospital IT department for version information as this is a custom systemVerify Fix Applied:
Attempt to exploit the vulnerability after patch application. Verify that cookie manipulation no longer allows unauthorized access and proper authentication is enforced.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful access with modified cookies
- User accessing accounts not associated with their credentials
- Unusual cookie parameter modifications in access logs
Network Indicators:
- HTTP requests with manipulated cookie values
- Rapid session switching between different user accounts
SIEM Query:
source="web_logs" AND (cookie_manipulation_detected OR user_id_mismatch OR session_hijacking_attempt)