CVE-2021-43140
📋 TL;DR
CVE-2021-43140 is a critical SQL injection vulnerability in Simple Subscription Website 1.0 that allows attackers to execute arbitrary SQL commands through the login functionality. This affects all deployments of this specific software version, potentially leading to complete system compromise.
💻 Affected Systems
- Sourcecodester Simple Subscription Website
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data theft, modification, deletion, and potential remote code execution leading to full system takeover.
Likely Case
Authentication bypass allowing unauthorized access to the application, followed by data exfiltration and privilege escalation.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection.
🎯 Exploit Status
Multiple public exploit scripts available. Exploitation requires no authentication and is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available. Upgrade to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Implement Input Validation
allAdd server-side input validation to sanitize login parameters
Modify login.php to validate and sanitize user input before SQL queries
Use Parameterized Queries
allReplace direct SQL string concatenation with prepared statements
Update database queries in login.php to use parameterized queries
🧯 If You Can't Patch
- Implement WAF rules to block SQL injection patterns
- Restrict network access to only trusted IP addresses
🔍 How to Verify
Check if Vulnerable:
Test login form with SQL injection payloads like ' OR '1'='1Check Version:
Check application version in admin panel or source codeVerify Fix Applied:
Attempt SQL injection payloads after implementing fixes to confirm they're blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in application logs
- Multiple failed login attempts with SQL patterns
Network Indicators:
- HTTP POST requests to login.php containing SQL keywords
SIEM Query:
source=web_logs AND uri="/login.php" AND (payload="' OR" OR payload="UNION" OR payload="SELECT")🔗 References
- http://packetstormsecurity.com/files/164968/Simple-Subscription-Website-1.0-SQL-Injection.html
- https://github.com/Dir0x/CVE-2021-43140
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-43140
- http://packetstormsecurity.com/files/164968/Simple-Subscription-Website-1.0-SQL-Injection.html
- https://github.com/Dir0x/CVE-2021-43140
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-43140
