CVE-2025-51657
📋 TL;DR
SemCms v5.0 contains a SQL injection vulnerability in the SEMCMS_Link.php file through the lgid parameter. This allows attackers to execute arbitrary SQL commands on the database. All users running SemCms v5.0 are affected.
💻 Affected Systems
- SemCms
📦 What is this software?
Semcms by Sem Cms
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data manipulation, or full system takeover via subsequent attacks.
Likely Case
Database information disclosure, including user credentials, sensitive content, or configuration data.
If Mitigated
Limited impact with proper input validation and parameterized queries in place.
🎯 Exploit Status
SQL injection via GET/POST parameter requires minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://semcms.com
Restart Required: No
Instructions:
Check vendor website for updates. If unavailable, implement workarounds.
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to sanitize lgid parameter before processing.
Edit SEMCMS_Link.php to validate lgid as integer: if(!is_numeric($_GET['lgid'])) { die('Invalid input'); }
WAF Rule
allDeploy web application firewall to block SQL injection patterns.
ModSecurity rule: SecRule ARGS:lgid "@detectSQLi" "id:1001,phase:2,deny"
🧯 If You Can't Patch
- Restrict access to SEMCMS_Link.php via firewall rules.
- Monitor database logs for unusual SQL queries.
🔍 How to Verify
Check if Vulnerable:
Test SEMCMS_Link.php with payload: lgid=1' OR '1'='1Check Version:
Check SemCms version in admin panel or configuration files.Verify Fix Applied:
Test with same payload; should return error or no data.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in web server logs
- Multiple requests to SEMCMS_Link.php with SQL syntax
Network Indicators:
- HTTP requests containing SQL keywords like UNION, SELECT, OR
SIEM Query:
source="web.log" AND uri="/SEMCMS_Link.php" AND (lgid="*'*" OR lgid="*OR*" OR lgid="*UNION*")