CVE-2020-36034 – This CVE describes a SQL injection vulnerabilit... (How to Fix)

📋 TL;DR

This CVE describes a SQL injection vulnerability in the School Faculty Scheduling System version 1.0 that allows remote attackers to execute arbitrary SQL commands via the 'id' parameter in manage_user.php. Attackers can potentially execute arbitrary code, escalate privileges, and access sensitive information. Anyone running this specific version of the software is affected.

💻 Affected Systems

Products:

School Faculty Scheduling System

Versions: Version 1.0

Operating Systems: Any OS running PHP/MySQL

Default Config Vulnerable: ⚠️ Yes

Notes: Affects the specific PHP/MySQL implementation from the referenced sources. No authentication bypass mentioned, but SQL injection can lead to privilege escalation.

📦 What is this software?

School Faculty Scheduling System by School Faculty Scheduling System Project

View all CVEs affecting School Faculty Scheduling System →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise including remote code execution, privilege escalation to administrator, database exfiltration, and potential lateral movement within the network.

🟠

Likely Case

Database compromise leading to sensitive information disclosure (user credentials, personal data), privilege escalation, and potential system takeover.

🟢

If Mitigated

Limited impact with proper input validation and parameterized queries preventing SQL injection, though other vulnerabilities may still exist.

🌐 Internet-Facing: HIGH - The vulnerability is remotely exploitable via web interface and has a CVSS score of 9.8 indicating critical severity.

🏢 Internal Only: HIGH - Even if not internet-facing, internal attackers or compromised accounts could exploit this vulnerability.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

SQL injection vulnerabilities are commonly weaponized. The vulnerability is in a publicly available source code repository, making exploitation straightforward for attackers.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Unknown

Vendor Advisory: None found

Restart Required: No

Instructions:

1. Download latest version from source if available
2. Replace vulnerable manage_user.php file
3. Implement parameterized queries and input validation
4. Test thoroughly before deployment

🔧 Temporary Workarounds

Web Application Firewall (WAF)

all

Deploy WAF rules to block SQL injection patterns in the id parameter

Input Validation Filter

all

Add server-side validation to only accept numeric values for id parameter

// PHP example: if(!is_numeric($_GET['id'])) { die('Invalid input'); }

🧯 If You Can't Patch

Isolate the system from internet access and restrict internal network access
Implement strict network segmentation and monitor all traffic to/from the system

🔍 How to Verify

Check if Vulnerable:

Test the manage_user.php endpoint with SQL injection payloads like: manage_user.php?id=1' OR '1'='1

Check Version:

Check source code or documentation for version information

Verify Fix Applied:

Attempt SQL injection tests and verify they are blocked or properly handled

📡 Detection & Monitoring

Log Indicators:

Unusual SQL error messages in application logs
Multiple failed login attempts followed by SQL injection patterns
Unexpected database queries from web application

Network Indicators:

HTTP requests with SQL keywords in id parameter (SELECT, UNION, etc.)
Unusual traffic patterns to manage_user.php endpoint

SIEM Query:

source="web_logs" AND uri="*manage_user.php*" AND (query="*id=*SELECT*" OR query="*id=*UNION*" OR query="*id=*OR*'1'='1*")

📊 Metadata

CVE ID: CVE-2020-36034

CVSS v3 Score: 9.8 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-89

Published: August 11, 2023

Last Updated: November 21, 2024

🔗 References

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