CVE-2017-17111
📋 TL;DR
CVE-2017-17111 is a critical SQL injection vulnerability in Posty Readymade Classifieds Script 1.0 that allows attackers to execute arbitrary SQL commands via unvalidated parameters in listings.php and ads-details.php. This affects all users running version 1.0 of the script, potentially leading to complete database compromise.
💻 Affected Systems
- Posty Readymade Classifieds Script
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data theft, data manipulation, authentication bypass, and potential remote code execution via database functions.
Likely Case
Database information disclosure, data manipulation, and potential administrative access to the classifieds system.
If Mitigated
Limited impact with proper input validation and parameterized queries in place.
🎯 Exploit Status
Multiple public exploit scripts available, trivial to exploit with basic SQL injection knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available. Upgrade to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Input Validation and Sanitization
allAdd input validation and parameterized queries to listings.php and ads-details.php
Modify PHP files to use prepared statements: $stmt = $pdo->prepare('SELECT * FROM table WHERE id = ?'); $stmt->execute([$id]);
Web Application Firewall (WAF)
allDeploy WAF rules to block SQL injection patterns
Add WAF rules to block patterns like: UNION SELECT, OR 1=1, --, /*, etc.
🧯 If You Can't Patch
- Implement strict input validation for catid and ID parameters
- Deploy network segmentation and restrict database access
🔍 How to Verify
Check if Vulnerable:
Test with payload: listings.php?catid=1' OR '1'='1Check Version:
Check script version in admin panel or readme filesVerify Fix Applied:
Test SQL injection attempts should return error or no data📡 Detection & Monitoring
Log Indicators:
- SQL syntax errors in web logs
- Unusual database queries from web server
- Multiple failed parameter requests
Network Indicators:
- HTTP requests with SQL keywords in parameters
- Unusual database port traffic from web server
SIEM Query:
source="web_logs" AND ("UNION SELECT" OR "OR 1=1" OR "--" OR "/*")