CVE-2023-43899
📋 TL;DR
Hansun CMS v1.0 contains a SQL injection vulnerability in the /ajax/ajax_login.ashx component that allows attackers to execute arbitrary SQL commands. This affects all deployments of Hansun CMS v1.0, potentially compromising the entire database and application. Attackers can exploit this without authentication to steal, modify, or delete sensitive data.
💻 Affected Systems
- Hansun CMS
📦 What is this software?
Hansuncms by Hansuncms Project
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, authentication bypass, and potential remote code execution if database functions allow it.
Likely Case
Unauthenticated attackers extracting sensitive user data, administrative credentials, and potentially gaining administrative access to the CMS.
If Mitigated
Limited impact with proper input validation, parameterized queries, and web application firewall rules blocking SQL injection patterns.
🎯 Exploit Status
Public proof-of-concept code exists showing exploitation via the login endpoint. The vulnerability requires no authentication and has simple exploitation vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch is available. Consider migrating to alternative CMS solutions or implementing custom fixes with parameterized queries and input validation.
🔧 Temporary Workarounds
Web Application Firewall Rules
allImplement WAF rules to block SQL injection patterns targeting /ajax/ajax_login.ashx
# Example ModSecurity rule: SecRule REQUEST_URI "@streq /ajax/ajax_login.ashx" "id:1001,phase:2,deny,status:403,msg:'Blocking Hansun CMS SQLi attempt'"
# Add SQL injection detection patterns to existing WAF rules
Input Validation Filter
windowsAdd server-side input validation to sanitize parameters before processing
# Example ASP.NET validation: string sanitizedInput = Regex.Replace(userInput, @"[^a-zA-Z0-9@._-]", "")
# Implement parameter whitelisting for login fields
🧯 If You Can't Patch
- Block external access to /ajax/ajax_login.ashx via firewall rules or web server configuration
- Implement network segmentation to isolate the Hansun CMS server from sensitive databases
🔍 How to Verify
Check if Vulnerable:
Test the /ajax/ajax_login.ashx endpoint with SQL injection payloads like ' OR '1'='1 in username/password parametersCheck Version:
Check CMS version in admin panel or configuration filesVerify Fix Applied:
Verify that SQL injection payloads no longer work and that parameterized queries are implemented in the login handler📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in application logs
- Multiple failed login attempts with SQL syntax in parameters
- Requests to /ajax/ajax_login.ashx with special characters like quotes, semicolons, or comments
Network Indicators:
- HTTP POST requests to /ajax/ajax_login.ashx containing SQL keywords (SELECT, UNION, OR, etc.)
- Unusual database query patterns from the application server
SIEM Query:
source="web_logs" AND uri="/ajax/ajax_login.ashx" AND (request_body LIKE "%OR%" OR request_body LIKE "%SELECT%" OR request_body LIKE "%UNION%")