CVE-2021-36124
📋 TL;DR
CVE-2021-36124 is an authentication bypass vulnerability in Echo ShareCare 8.15.5 that allows unauthenticated attackers to access sensitive resources without credentials. This affects all systems running the vulnerable Echo ShareCare version, potentially exposing them to SQL injection and other attacks through unprotected endpoints.
💻 Affected Systems
- Echo ShareCare
📦 What is this software?
Sharecare by Echobh
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through SQL injection leading to data exfiltration, privilege escalation, or remote code execution.
Likely Case
Unauthorized access to sensitive data and potential SQL injection attacks against the database.
If Mitigated
Limited impact if proper network segmentation and authentication controls are implemented.
🎯 Exploit Status
Exploitation requires no authentication and minimal technical skill due to public proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.15.6 or later
Vendor Advisory: https://github.com/atredispartners/advisories/blob/master/ATREDIS-2021-0001.md
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download and install Echo ShareCare version 8.15.6 or later from official vendor. 3. Restart the Echo ShareCare service. 4. Verify authentication is required for all sensitive endpoints.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict network access to Echo ShareCare using firewall rules
iptables -A INPUT -p tcp --dport [Echo_ShareCare_port] -s [trusted_network] -j ACCEPT
iptables -A INPUT -p tcp --dport [Echo_ShareCare_port] -j DROP
Web Application Firewall
allImplement WAF rules to block unauthenticated access to sensitive paths
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Echo ShareCare from untrusted networks
- Deploy a reverse proxy with authentication requirements for all sensitive endpoints
🔍 How to Verify
Check if Vulnerable:
Attempt to access sensitive Echo ShareCare endpoints without authentication. If accessible, system is vulnerable.Check Version:
Check Echo ShareCare administration interface or configuration files for version informationVerify Fix Applied:
Verify authentication is required for all previously accessible sensitive endpoints and test for SQL injection vulnerabilities.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access attempts to sensitive endpoints
- SQL error messages in application logs
- Unusual database queries from application user
Network Indicators:
- HTTP requests to sensitive endpoints without authentication headers
- SQL injection patterns in HTTP requests
SIEM Query:
source="echo_sharecare" AND (url_path="/sensitive/*" AND NOT auth_success="true")