CVE-2021-43137
📋 TL;DR
This vulnerability in hostel management system 2.1 allows attackers to perform Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) attacks via the name field in my-profile.php. When chained together, these vulnerabilities can lead to complete account takeover. Users of hostel management system 2.1 are affected.
💻 Affected Systems
- Hostel Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover leading to unauthorized access, data theft, privilege escalation, and potential compromise of the entire system if admin accounts are affected.
Likely Case
Session hijacking, unauthorized profile modifications, and potential data exfiltration from affected user accounts.
If Mitigated
Limited impact with proper input validation, output encoding, and CSRF tokens preventing successful exploitation.
🎯 Exploit Status
Exploit requires user to be logged in and interact with malicious content. The chaining of XSS and CSRF makes exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Implement proper input validation on the name field in my-profile.php
2. Add output encoding for all user-controlled data
3. Implement CSRF tokens for all state-changing operations
4. Update to a patched version if available from the vendor
🔧 Temporary Workarounds
Input Validation and Sanitization
allAdd server-side validation to restrict name field to alphanumeric characters only
Modify my-profile.php to include: $name = preg_replace('/[^a-zA-Z0-9\s]/', '', $_POST['name']);
CSRF Token Implementation
allAdd CSRF tokens to all forms to prevent cross-site request forgery
Add hidden CSRF token field to forms: <input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token']; ?>">
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS and CSRF patterns
- Disable or restrict access to my-profile.php functionality if not essential
🔍 How to Verify
Check if Vulnerable:
Test the name field in my-profile.php with XSS payloads like <script>alert('XSS')</script> and check if it executesCheck Version:
Check system version in admin panel or configuration filesVerify Fix Applied:
Verify that XSS payloads are properly sanitized and CSRF tokens are required for profile updates📡 Detection & Monitoring
Log Indicators:
- Unusual name field entries containing script tags or special characters
- Multiple profile update requests from same IP
Network Indicators:
- HTTP requests with suspicious payloads in name parameter
- Cross-origin requests to my-profile.php without proper referrer
SIEM Query:
source="web_logs" AND (uri="*my-profile.php*" AND (param="*<script>*" OR param="*javascript:*"))