CVE-2020-18116
📋 TL;DR
CVE-2020-18116 is an SQL injection vulnerability in YouDianCMS 8.0 that allows attackers to execute arbitrary SQL commands through unfiltered search keywords. This affects all deployments of YouDianCMS 8.0, potentially compromising database integrity and confidentiality.
💻 Affected Systems
- YouDianCMS
📦 What is this software?
Youdiancms by Youdiancms
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise allowing data theft, modification, deletion, or remote code execution via database functions.
Likely Case
Unauthorized data extraction, privilege escalation, or database manipulation leading to business disruption.
If Mitigated
Limited impact with proper input validation and database permissions, potentially only error disclosure.
🎯 Exploit Status
SQL injection via search parameter requires minimal technical skill. Public proof-of-concept exists in Chinese security blogs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Consider upgrading to newer YouDianCMS version if available, or implement workarounds.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side input validation to sanitize search keywords before processing
Modify search.php to add: $keyword = mysqli_real_escape_string($conn, $_GET['keyword']);
WAF Rule
allImplement web application firewall rules to block SQL injection patterns in search parameters
Add WAF rule: SecRule ARGS_GET:keyword "@detectSQLi" "id:1001,phase:2,deny"
🧯 If You Can't Patch
- Disable search functionality completely if not essential
- Implement network segmentation to restrict database access from web servers
🔍 How to Verify
Check if Vulnerable:
Test search functionality with SQL injection payload: ' OR '1'='1Check Version:
Check YouDianCMS version in admin panel or readme filesVerify Fix Applied:
Test with same payload after fixes - should return normal results or error message without SQL execution📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in application logs
- Multiple failed login attempts after search queries
- Long or unusual search strings containing SQL keywords
Network Indicators:
- HTTP requests with SQL keywords in search parameters
- Unusual database query patterns from web server
SIEM Query:
source="web_logs" AND (url="*search*" AND (query="*OR*" OR query="*UNION*" OR query="*SELECT*"))