CVE-2023-50035
📋 TL;DR
PHPGurukul Small CRM 3.0 has a critical SQL injection vulnerability in the login panel's password parameter that allows attackers to execute arbitrary SQL commands. This affects all systems running this specific CRM version without proper input validation. Attackers can potentially bypass authentication, extract sensitive data, or take control of the database.
💻 Affected Systems
- PHPGurukul Small CRM
📦 What is this software?
Small Crm by Small Crm Project
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, authentication bypass, privilege escalation, and potential remote code execution if database functions allow it.
Likely Case
Authentication bypass allowing unauthorized access to the CRM system, followed by data extraction and potential lateral movement within the network.
If Mitigated
Limited impact with proper network segmentation, WAF rules blocking SQL injection patterns, and database user privilege restrictions.
🎯 Exploit Status
Public exploit code available on GitHub. SQL injection is straightforward with common payloads. No authentication required as it's on login page.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Review PHPGurukul website for security updates
2. Apply any available patches
3. Manually implement input validation and parameterized queries
4. Test thoroughly before deployment
🔧 Temporary Workarounds
Implement Input Validation
allAdd server-side validation to sanitize password input before SQL query execution
// PHP example: Use prepared statements
$stmt = $conn->prepare('SELECT * FROM users WHERE username = ? AND password = ?');
$stmt->bind_param('ss', $username, $password);
Web Application Firewall Rules
allDeploy WAF rules to block SQL injection patterns on login endpoints
# ModSecurity example rule
SecRule ARGS:password "@detectSQLi" "id:1001,phase:2,deny,status:403,msg:'SQL Injection Attempt'
🧯 If You Can't Patch
- Isolate the CRM system behind a reverse proxy with strict input filtering
- Implement network segmentation to limit database access from CRM application
🔍 How to Verify
Check if Vulnerable:
Test login page with SQL injection payloads like ' OR '1'='1 in password field and observe database errors or successful login bypassCheck Version:
Check CRM admin panel or review source code for version informationVerify Fix Applied:
Attempt SQL injection payloads after fixes; should receive proper error messages or failed login attempts without database errors📡 Detection & Monitoring
Log Indicators:
- Unusual SQL syntax in login attempts
- Multiple failed login attempts with SQL keywords
- Database error logs showing malformed queries
Network Indicators:
- HTTP POST requests to login.php with SQL payloads in parameters
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND (url_path="/login.php" OR url_path="/user/login") AND (message="*sql*" OR message="*union*" OR message="*select*" OR message="*or 1=1*")