CVE-2023-40945
📋 TL;DR
CVE-2023-40945 is a critical SQL injection vulnerability in Sourcecodester Doctor Appointment System 1.0 that allows attackers to execute arbitrary SQL commands through the $userid parameter in doctors/myDetails.php. This affects all installations of the vulnerable software version. Attackers can potentially access, modify, or delete database content.
💻 Affected Systems
- Sourcecodester Doctor Appointment System
📦 What is this software?
Doctor Appointment System by Doctor Appointment System Project
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to patient data theft, appointment manipulation, credential harvesting, and potential server takeover via SQL injection to RCE chaining.
Likely Case
Unauthorized access to sensitive medical records, appointment data manipulation, and potential privilege escalation within the application.
If Mitigated
Limited impact with proper input validation and database permissions, potentially only allowing data viewing without modification.
🎯 Exploit Status
Exploitation requires authentication as a doctor user. The vulnerability is in a parameter that should be properly sanitized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Review the vulnerable file doctors/myDetails.php
2. Implement parameterized queries or proper input validation for $userid
3. Test the fix thoroughly before deployment
🔧 Temporary Workarounds
Input Validation and Sanitization
allAdd input validation to ensure $userid contains only expected values
Modify doctors/myDetails.php to validate $userid as integer using is_numeric() or filter_var()
Web Application Firewall (WAF)
allDeploy WAF rules to block SQL injection patterns
Configure WAF to detect and block SQL injection attempts in POST/GET parameters
🧯 If You Can't Patch
- Isolate the application behind a reverse proxy with strict input filtering
- Implement network segmentation to limit database access from application servers
🔍 How to Verify
Check if Vulnerable:
Test the doctors/myDetails.php endpoint with SQL injection payloads in the userid parameterCheck Version:
Check application version in admin panel or configuration filesVerify Fix Applied:
Attempt SQL injection after implementing fixes and verify no database errors or unexpected behavior📡 Detection & Monitoring
Log Indicators:
- SQL syntax errors in application logs
- Unusual database queries from application user
- Multiple failed login attempts followed by successful doctor login
Network Indicators:
- SQL keywords in HTTP requests to doctors/myDetails.php
- Unusual database port traffic from web server
SIEM Query:
source="web_logs" AND uri="*myDetails.php*" AND (query="*UNION*" OR query="*SELECT*" OR query="*INSERT*" OR query="*DELETE*")