CVE-2025-56385
📋 TL;DR
This SQL injection vulnerability in WellSky Harmony's login functionality allows attackers to bypass authentication, access sensitive data, or compromise the backend database. It affects WellSky Harmony version 4.1.0.2.83 specifically. Organizations using this healthcare software are at risk of data breaches and system compromise.
💻 Affected Systems
- WellSky Harmony
📦 What is this software?
Harmony by Wellsky
⚠️ Risk & Real-World Impact
Worst Case
Full database compromise leading to complete data exfiltration, privilege escalation, and potential ransomware deployment across the healthcare system.
Likely Case
Authentication bypass allowing unauthorized access to patient records and sensitive healthcare data, potentially leading to HIPAA violations.
If Mitigated
Limited impact with proper input validation and WAF rules blocking malicious SQL patterns.
🎯 Exploit Status
SQL injection in login page is easily weaponizable. No public exploit code found but trivial to craft.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://wellsky.com
Restart Required: No
Instructions:
1. Contact WellSky support for patch availability 2. Apply vendor-provided patch 3. Test in non-production environment first 4. Deploy to production systems
🔧 Temporary Workarounds
WAF Rule Implementation
allDeploy web application firewall rules to block SQL injection patterns targeting TXTUSERID parameter
# Example ModSecurity rule: SecRule ARGS:TXTUSERID "@detectSQLi" "id:1001,phase:2,deny,status:403"
Input Validation Filter
windowsImplement input validation to reject SQL special characters in login fields
# Example ASP input sanitization: TXTUSERID = Replace(Replace(Request.Form("TXTUSERID"), "'", ""), ";", "")
🧯 If You Can't Patch
- Isolate the Harmony server behind a reverse proxy with strict input validation
- Implement network segmentation to limit database access from the application server
🔍 How to Verify
Check if Vulnerable:
Test the xmHarmony.asp endpoint with SQL injection payloads in TXTUSERID parameter (e.g., ' OR '1'='1)Check Version:
Check Harmony application version in administrative interface or about pageVerify Fix Applied:
Verify that SQL injection payloads no longer bypass authentication or return database errors📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in application logs
- Multiple failed login attempts with SQL patterns
- Successful logins from unexpected IP addresses
Network Indicators:
- HTTP POST requests to xmHarmony.asp containing SQL keywords
- Unusual database query patterns from application server
SIEM Query:
source="harmony_logs" AND ("SQL" OR "syntax" OR "xp_" OR "UNION" OR "SELECT")