CVE-2024-33987
📋 TL;DR
This is a Cross-Site Scripting (XSS) vulnerability in School Attendance Monitoring System and School Event Management System version 1.0. An attacker can craft malicious URLs containing JavaScript payloads in multiple parameters to steal session cookies when victims click the links. This affects all users of these systems who access the vulnerable '/report/index.php' endpoint.
💻 Affected Systems
- School Attendance Monitoring System
- School Event Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full system access, manipulate attendance/event records, access sensitive student data, and potentially compromise the entire system.
Likely Case
Attackers steal user session cookies to impersonate legitimate users, access unauthorized data, and perform actions within the victim's privilege level.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized, preventing cookie theft and maintaining session integrity.
🎯 Exploit Status
XSS vulnerabilities are commonly weaponized. The vulnerability requires no authentication and exploitation is straightforward via crafted URLs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-janobe-products
Restart Required: No
Instructions:
1. Check vendor website for security updates. 2. If patch is released, download and apply according to vendor instructions. 3. Test the fix in a non-production environment first.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side validation and HTML encoding for all user inputs in the vulnerable parameters.
Implement PHP functions like htmlspecialchars() or filter_var() on all user inputs before processing
Web Application Firewall (WAF) Rules
allConfigure WAF to block requests containing suspicious script patterns in the vulnerable parameters.
Add WAF rules to detect and block patterns like <script>, javascript:, onload=, etc. in URL parameters
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Disable or restrict access to '/report/index.php' endpoint if not essential
🔍 How to Verify
Check if Vulnerable:
Test by injecting harmless payloads like <script>alert('test')</script> into the vulnerable parameters and check if script executes.Check Version:
Check system documentation or configuration files for version information, or examine the application interface for version details.Verify Fix Applied:
Re-test with the same payloads after implementing fixes - scripts should not execute and should be properly encoded in output.📡 Detection & Monitoring
Log Indicators:
- Unusual long parameter values in '/report/index.php' requests
- Requests containing script tags or JavaScript patterns in URL parameters
- Multiple failed login attempts following suspicious URL accesses
Network Indicators:
- HTTP requests with encoded script payloads in query parameters
- Traffic patterns showing users accessing unusual URLs with long parameter strings
SIEM Query:
source="web_server_logs" AND uri_path="/report/index.php" AND (query_string="*<script>*" OR query_string="*javascript:*" OR query_string="*onload=*")