CVE-2023-49639
📋 TL;DR
Billing Software v1.0 contains unauthenticated SQL injection vulnerabilities in the buyer_invoice_submit.php file, specifically in the 'customer_details' parameter. This allows attackers to execute arbitrary SQL commands without authentication, potentially compromising the entire database. All users running Billing Software v1.0 are affected.
💻 Affected Systems
- Billing Software
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data theft, data manipulation, authentication bypass, and potential remote code execution leading to full system takeover.
Likely Case
Database information disclosure, data manipulation, and potential privilege escalation leading to unauthorized access to sensitive billing and customer data.
If Mitigated
Limited impact with proper input validation and database permissions, potentially only allowing data viewing without modification.
🎯 Exploit Status
SQL injection is well-understood with many automated tools available. The unauthenticated nature makes exploitation trivial.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check vendor website for updates 2. Apply any available patches 3. Test functionality after patching
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to filter SQL injection characters in the customer_details parameter
Modify buyer_invoice_submit.php to sanitize user input using prepared statements or parameterized queries
Web Application Firewall
allDeploy WAF with SQL injection protection rules
Configure WAF to block SQL injection patterns in POST requests to buyer_invoice_submit.php
🧯 If You Can't Patch
- Isolate the system from internet access and restrict to internal network only
- Implement strict network segmentation and monitor all traffic to the vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Test the buyer_invoice_submit.php endpoint with SQL injection payloads in the customer_details parameter and observe database errors or unexpected responses.Check Version:
Check software documentation or interface for version informationVerify Fix Applied:
Attempt SQL injection after applying fixes and verify that input is properly sanitized and no database errors are returned.📡 Detection & Monitoring
Log Indicators:
- Unusual database queries from web server
- SQL syntax errors in application logs
- Multiple failed login attempts following SQL injection patterns
Network Indicators:
- POST requests to buyer_invoice_submit.php containing SQL keywords like UNION, SELECT, INSERT, DROP
- Unusual database port traffic from web server
SIEM Query:
source="web_logs" AND uri="/buyer_invoice_submit.php" AND (request_body CONTAINS "UNION" OR request_body CONTAINS "SELECT" OR request_body CONTAINS "INSERT" OR request_body CONTAINS "DROP")