CVE-2020-23685
📋 TL;DR
This SQL injection vulnerability in 188Jianzhan v2.1.0 allows attackers to execute arbitrary SQL commands via the username parameter in login.php. Attackers can gain escalated privileges and potentially execute arbitrary code on affected systems. Anyone running 188Jianzhan v2.1.0 is vulnerable.
💻 Affected Systems
- 188Jianzhan
📦 What is this software?
188jianzhan by Vtimecn
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution, data exfiltration, and persistent backdoor installation
Likely Case
Authentication bypass leading to unauthorized administrative access and data manipulation
If Mitigated
Failed login attempts logged with no successful exploitation due to input validation
🎯 Exploit Status
SQL injection via login form requires no authentication and has simple exploitation vectors
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check GitHub repository for updated version
2. Replace vulnerable login.php with patched version
3. Test authentication functionality
🔧 Temporary Workarounds
Input Validation Filter
allAdd parameterized queries and input validation to login.php
Modify login.php to use prepared statements: $stmt = $conn->prepare('SELECT * FROM users WHERE username = ?'); $stmt->bind_param('s', $username);
Web Application Firewall
allDeploy WAF with SQL injection rules to block malicious requests
🧯 If You Can't Patch
- Isolate the 188Jianzhan instance behind a reverse proxy with strict input filtering
- Implement network segmentation to limit access to the vulnerable system
🔍 How to Verify
Check if Vulnerable:
Test login.php with SQL injection payloads in username field: ' OR '1'='1Check Version:
Check version in application files or configuration: grep -r 'version' /path/to/188jianzhan/Verify Fix Applied:
Attempt SQL injection payloads and verify they are rejected or properly escaped📡 Detection & Monitoring
Log Indicators:
- Unusual SQL syntax in username fields
- Multiple failed login attempts with SQL keywords
- Successful logins from unusual IP addresses
Network Indicators:
- HTTP POST requests to login.php containing SQL keywords
- Unusual database connection patterns
SIEM Query:
source="web_logs" AND uri="/login.php" AND (username="*OR*" OR username="*UNION*" OR username="*SELECT*")