CVE-2019-25539
📋 TL;DR
202CMS v10 beta contains an unauthenticated blind SQL injection vulnerability in the log_user parameter. Attackers can exploit this to extract sensitive database information using time-based injection techniques. All systems running the vulnerable version are affected.
💻 Affected Systems
- 202CMS
📦 What is this software?
202cms by Konradpl99
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including extraction of user credentials, personal data, and administrative access leading to full system takeover.
Likely Case
Extraction of sensitive user data, database schema information, and potential privilege escalation.
If Mitigated
Limited information disclosure if proper input validation and WAF rules are in place.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB and other sources, making this easily weaponizable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check for updated version from vendor (if available)
2. Apply input validation to log_user parameter
3. Use parameterized queries or prepared statements
4. Implement proper SQL injection filters
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to sanitize the log_user parameter before processing
// PHP example: filter log_user input
$log_user = filter_var($_POST['log_user'], FILTER_SANITIZE_STRING);
// Or use prepared statements with PDO/mysqli
WAF Rule Implementation
allDeploy web application firewall rules to block SQL injection patterns
# ModSecurity example rule
SecRule ARGS:log_user "@detectSQLi" "id:1001,phase:2,deny,status:403,msg:'SQL Injection Attempt'"
# Cloudflare WAF: Enable SQL Injection protection
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems from sensitive data
- Deploy intrusion detection systems to monitor for SQL injection attempts
🔍 How to Verify
Check if Vulnerable:
Send POST request to index.php with log_user parameter containing SQL injection payload (e.g., ' OR SLEEP(5)-- ) and measure response timeCheck Version:
Check CMS version in admin panel or readme files; 202CMS v10 beta is vulnerableVerify Fix Applied:
Test with same SQL injection payloads and verify they are blocked or sanitized without executing📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to index.php with SQL keywords in parameters
- Multiple failed login attempts with SQL-like patterns
- Long response times indicating time-based injection
Network Indicators:
- POST requests containing SQL injection patterns (UNION, SELECT, SLEEP, etc.)
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND (uri="*/index.php" OR uri="*/register.php") AND (request_body="*SLEEP(*" OR request_body="*UNION*SELECT*" OR request_body="*OR*1=1*")