CVE-2023-49547
📋 TL;DR
CVE-2023-49547 is a critical SQL injection vulnerability in Customer Support System v1 that allows attackers to execute arbitrary SQL commands via the username parameter during login. This affects all deployments of Customer Support System v1, potentially compromising the entire database and application. Attackers can exploit this without authentication to steal sensitive data, modify records, or gain administrative access.
💻 Affected Systems
- Customer Support System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, authentication bypass, and full system takeover via SQL injection to RCE if database functions allow command execution.
Likely Case
Unauthenticated attackers extracting sensitive customer data, modifying support tickets, and gaining administrative privileges to control the entire application.
If Mitigated
Attack attempts are blocked at the web application firewall level, with no successful exploitation and only failed login attempts logged.
🎯 Exploit Status
Public exploit code is available on GitHub, making exploitation trivial for attackers with basic SQL injection knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch exists. Replace vulnerable code with parameterized queries: 1. Locate /customer_support/ajax.php 2. Find login function 3. Replace raw SQL with prepared statements using mysqli or PDO 4. Validate and sanitize all user inputs
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allDeploy WAF rules to block SQL injection patterns in the username parameter
# Example ModSecurity rule: SecRule ARGS:username "@detectSQLi" "id:1001,phase:2,deny,status:403"
Input Validation Filter
allAdd input validation to reject suspicious characters in username field
# PHP code snippet: if (preg_match('/[\'\"\;\-\#\*]/', $_POST['username'])) { die('Invalid input'); }
🧯 If You Can't Patch
- Block external access to /customer_support/ajax.php via firewall rules or web server configuration
- Implement network segmentation to isolate the vulnerable system from sensitive databases and other critical assets
🔍 How to Verify
Check if Vulnerable:
Test with SQL injection payload in username field: ' OR '1'='1 at /customer_support/ajax.php?action=login. If login succeeds without valid credentials, system is vulnerable.Check Version:
Check source code or documentation for version information, or examine file headers in PHP files for version referencesVerify Fix Applied:
Attempt the same SQL injection payload. System should reject the input or return authentication failure regardless of payload.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts with SQL syntax in username field
- Unusual database queries from web application user
- Login attempts containing special SQL characters: ', ", ;, --, #, /*
Network Indicators:
- HTTP POST requests to /customer_support/ajax.php with SQL injection patterns in parameters
- Unusual database port traffic spikes following login attempts
SIEM Query:
source="web_logs" AND uri="/customer_support/ajax.php" AND (username="*'*" OR username="*--*" OR username="*/*" OR username="*#*")