CVE-2020-19110
📋 TL;DR
This CVE describes a SQL injection vulnerability in Online Book Store v1.0, allowing remote attackers to execute arbitrary SQL commands via the bookisbn parameter in book.php. This can lead to unauthorized data access, modification, or deletion, affecting any system running this vulnerable version of the software.
💻 Affected Systems
- Online Book Store
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full database compromise, including data theft, deletion, or remote code execution on the server, potentially leading to complete system takeover.
Likely Case
Unauthorized access to sensitive data such as user credentials, book records, or personal information stored in the database.
If Mitigated
Limited impact with proper input validation and parameterized queries, preventing SQL injection but requiring other security measures.
🎯 Exploit Status
Exploitation is straightforward due to the direct parameter manipulation; public references indicate proof-of-concept details are available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: No official vendor advisory found; refer to GitHub issues for community discussions.
Restart Required: No
Instructions:
No official patch provided; implement workarounds such as input validation and use parameterized queries in the book.php file.
🔧 Temporary Workarounds
Implement Input Validation and Parameterized Queries
allModify the book.php script to sanitize the bookisbn parameter and use prepared statements to prevent SQL injection.
Edit book.php to replace raw SQL queries with PDO or mysqli prepared statements; e.g., $stmt = $pdo->prepare('SELECT * FROM books WHERE isbn = ?'); $stmt->execute([$bookisbn]);
🧯 If You Can't Patch
- Deploy a web application firewall (WAF) with SQL injection rules to block malicious requests.
- Restrict network access to the application, limiting it to trusted IPs only.
🔍 How to Verify
Check if Vulnerable:
Test by sending a crafted payload to the bookisbn parameter (e.g., ' OR '1'='1) in a request to book.php and observe if SQL errors or unexpected data are returned.Check Version:
Check the software version in the application's documentation or configuration files; for PHP, review source code or project metadata.Verify Fix Applied:
After applying workarounds, repeat the test with malicious payloads; successful fixes should return no errors or data leakage.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in web server logs, multiple requests with SQL-like payloads to book.php.
Network Indicators:
- HTTP requests containing SQL injection patterns (e.g., UNION, SELECT, OR) targeting the bookisbn parameter.
SIEM Query:
Example: source="web_logs" AND uri="/book.php" AND (payload CONTAINS "' OR" OR payload CONTAINS "UNION" OR payload CONTAINS "SELECT")