CVE-2024-22718
📋 TL;DR
This is a Cross-Site Scripting (XSS) vulnerability in Form Tools 3.1.1 that allows attackers to inject malicious scripts via the client_id parameter in URLs. Attackers can execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies or performing actions on behalf of authenticated users. All installations of Form Tools 3.1.1 with the vulnerable component accessible are affected.
💻 Affected Systems
- Form Tools
📦 What is this software?
Form Tools by Formtools
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full control of the Form Tools application, access all form data, and potentially pivot to internal systems.
Likely Case
Attackers steal user session cookies, access form submissions containing sensitive data, and perform unauthorized actions within the application.
If Mitigated
With proper input validation and output encoding, the attack fails to execute malicious scripts, limiting impact to attempted exploitation logs.
🎯 Exploit Status
XSS vulnerabilities typically have low exploitation complexity. Attackers need to craft malicious URLs containing JavaScript payloads and trick users into visiting them.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
1. Check Form Tools vendor website for security updates. 2. If patch exists, download and apply according to vendor instructions. 3. Verify the fix by testing the vulnerable parameter with XSS payloads.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side validation of client_id parameter and properly encode all output to prevent script execution.
Implement input validation in affected PHP files: filter_var($client_id, FILTER_VALIDATE_INT) or similar validation
Use htmlspecialchars() or equivalent output encoding when displaying client_id values
Web Application Firewall (WAF) Rules
allDeploy WAF rules to block requests containing suspicious patterns in the client_id parameter.
Configure WAF to block requests with: client_id parameter containing <script>, javascript:, or other XSS indicators
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution sources
- Disable or restrict access to the vulnerable component if not essential for operations
🔍 How to Verify
Check if Vulnerable:
Test by accessing the vulnerable URL with client_id parameter containing a simple XSS payload like <script>alert('test')</script> and check if script executes.Check Version:
Check Form Tools version in admin interface or review installation files for version information.Verify Fix Applied:
Retest with the same XSS payloads after applying fixes. The payload should be displayed as plain text or blocked, not executed as JavaScript.📡 Detection & Monitoring
Log Indicators:
- HTTP requests with client_id parameter containing script tags, javascript: protocol, or other XSS indicators
- Unusual parameter values in client_id field
Network Indicators:
- HTTP requests with suspicious patterns in URL parameters
- Outbound connections to unexpected domains following form submissions
SIEM Query:
source="web_logs" AND (uri="*client_id=*<script>*" OR uri="*client_id=*javascript:*" OR uri="*client_id=*onerror=*")