CVE-2020-19108
📋 TL;DR
CVE-2020-19108 is a critical SQL injection vulnerability in Online Book Store v1.0 that allows remote attackers to execute arbitrary SQL commands through the pubid parameter. This affects all deployments of this specific PHP application version. Attackers can potentially compromise the entire database and execute arbitrary code on the server.
💻 Affected Systems
- Online Book Store
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, and remote code execution on the server, potentially resulting in full system takeover.
Likely Case
Database information disclosure, data manipulation, and potential privilege escalation within the application.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection.
🎯 Exploit Status
Simple SQL injection via GET parameter with public proof-of-concept available in GitHub issues.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Replace vulnerable bookPerPub.php file with secure version using parameterized queries. 2. Manually implement input validation and SQL injection protection. 3. Consider migrating to a maintained book store application.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy WAF rules to block SQL injection patterns in pubid parameter
Input Validation Filter
allAdd input validation to only accept numeric values for pubid parameter
Add to bookPerPub.php: if(!is_numeric($_GET['pubid'])) { die('Invalid input'); }
🧯 If You Can't Patch
- Isolate the application behind a reverse proxy with strict input filtering
- Implement network segmentation to limit database access from application server
🔍 How to Verify
Check if Vulnerable:
Test bookPerPub.php with payload: bookPerPub.php?pubid=1' OR '1'='1Check Version:
Check PHP files for version comments or project documentationVerify Fix Applied:
Test with same payload - should return error or no SQL injection behavior📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in application logs
- Multiple requests with SQL keywords in pubid parameter
- Long or malformed pubid parameter values
Network Indicators:
- HTTP requests to bookPerPub.php containing SQL injection patterns
- Unusual database query patterns from application server
SIEM Query:
source="web_logs" AND uri="*bookPerPub.php*" AND (query="*pubid=*'*" OR query="*pubid=*%27*")