CVE-2023-51927
📋 TL;DR
This vulnerability allows attackers to execute arbitrary SQL commands through the YonBIP HR attendance script controller. It affects organizations using YonBIP v3_23.05, potentially compromising sensitive HR and business data.
💻 Affected Systems
- YonBIP
📦 What is this software?
Yonbip by Yonyou
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data manipulation, and potential remote code execution through database functions.
Likely Case
Unauthorized access to sensitive HR data including employee records, attendance information, and personal identifiable information.
If Mitigated
Limited impact with proper input validation and database permission restrictions in place.
🎯 Exploit Status
SQL injection vulnerabilities are well-understood and easily weaponized with automated tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.yonyou.com/
Restart Required: No
Instructions:
1. Check vendor website for security updates. 2. Apply any available patches. 3. Verify the fix by testing the vulnerable endpoint.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation for the runScript() method parameters
Implement parameterized queries or stored procedures
Add input sanitization for script parameters
Access Restriction
allRestrict access to the vulnerable endpoint
Configure firewall rules to block external access to /attend/web/AttendScriptController
Implement IP whitelisting for administrative functions
🧯 If You Can't Patch
- Implement a Web Application Firewall (WAF) with SQL injection rules
- Restrict database user permissions to minimum required access
🔍 How to Verify
Check if Vulnerable:
Test the /attend/web/AttendScriptController endpoint with SQL injection payloads in the script parameterCheck Version:
Check application version in admin panel or configuration filesVerify Fix Applied:
Retest the vulnerable endpoint with SQL injection payloads to confirm they are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by script execution
- Long or malformed parameters in web server logs
Network Indicators:
- Unusual database connection patterns
- SQL keywords in HTTP POST parameters
- Excessive requests to the vulnerable endpoint
SIEM Query:
source="web_logs" AND uri="/attend/web/AttendScriptController" AND (param="script" CONTAINS "UNION" OR param="script" CONTAINS "SELECT" OR param="script" CONTAINS "INSERT")